Insulated Whole House Fan




  • Hardware Contributor

    @petewill Wow, amazing work 👍



  • @petewill Great work. Did you by any chance make it work with Mysensors V2 ?


  • Admin

    @rechin304 No not yet. It's on the list but it will be winter here for a while so it's not at the top. When were you planning to build yours?



  • @petewill I already build the wooden box, and i have all electronic parts. I do wait for threaded rod, threaded Insert, Ball Bearing to arrive from china. I just finish today the shield that will hold arduino, testing lcd screen (i have a different version then you have, less pin's and no need for resistors). I will try to convert your schetch latter to V2 (still need to make an gateway for V2). If successful i will post the code.


  • Admin

    @rechin304 Ok, sounds good. Let me know if you get stuck and I'll do my best to help.



  • This is hat i made until now. I have two issues:

    1. DHT11 is not working (no temp or hum is shown)
    2. I use Domoticz as controller and i do not see the node connecting to it, even the clock is sync with gateway. Gateway is version 2. So please if you have some time to look at the code your help be highly appreciated. Thanks.
    /**
       The MySensors Arduino library handles the wireless radio link and protocol
       between your home built sensors/actuators and HA controller of choice.
       The sensors forms a self healing radio network with optional repeaters. Each
       repeater and gateway builds a routing tables in EEPROM which keeps track of the
       network topology allowing messages to be routed to nodes.
    
       Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
       Copyright (C) 2013-2015 Sensnology AB
       Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
    
       Documentation: http://www.mysensors.org
       Support Forum: http://forum.mysensors.org
    
       This program is free software; you can redistribute it and/or
       modify it under the terms of the GNU General Public License
       version 2 as published by the Free Software Foundation.
    
       Power monitoring code adapted from: http://henrysbench.capnfatz.com/henrys-bench/arduino-current-measurements/acs712-arduino-ac-current-tutorial/
     *******************************
    
       REVISION HISTORY
       Version 1.0 - Initial code
       Version 2.0 - Changed for Mysensors v2
       
       DESCRIPTION
       The code below will run a MySensors whole house fan with wall mounted lcd control panel.  The fan is installed in the attic and an insulated cover will 
       open/close to conserve energy.  The project cost a little over $300 US.  A comparable commercial product costs around $1200.
       
       FEATURES
       - Physical button switch to control on/off in case there are ever issues with radio communications.  
       - DHT22 sensor for temp/humidity monitoring in the attic
       - LCD screen displays status, temp/humidity, errors & date/time
       - If an error occurs a message is sent to the gateway
       - When the unit looses power it will make sure the cover is closed and the fan is off after power is restored.
       - Safety Features
    	- The cover will wait to close until power has been shut off to the fan
    	- Customizable over current protection on the cover motor (automatically shut off if the cover gets stuck)
    	- Customizable cover close time limit (if it slips out off the coupling the motor won't run indefinitely)
    
       NOTE
       This program is too large to run with all debugging and the display enabled.
       To upload either comment out "#define DEBUG_ON" in the code below or comment out
       "#define DEBUG" in MyConfig.h in the MySensors library.
       For troubleshooting "#ifdef TFT_DISPLAY_ON" can be commented out so all debugging
       messages can be output to the serial monitor
    
    */
    // Enable debug prints to serial monitor
    #define MY_DEBUG
    // Enable and select radio type attached
    #define MY_RADIO_NRF24
    #define MY_RF24_PA_LEVEL RF24_PA_MAX
    
    #include <MySensors.h>
    #include <SPI.h>
    #include <Bounce2.h>
    #include <DHT.h>
    #include <Adafruit_GFX.h>    // Core graphics library
    #include <Adafruit_ST7735.h> // Hardware-specific library
    #include <Time.h>
    #include <TimeLib.h>
    
    //#define NODE_ID AUTO //or set to AUTO to have the gateway assign an ID
    
    //#define NODE_REPEAT false //change to true to set to a repeating/relaying node
    
    
    #define MY_NODE_ID AUTO  //set to AUTO to have the gateway assign an ID
    #define SKETCH_NAME "House Fan Mysensors v2"
    #define SKETCH_VERSION "2.1"
    
    #define FAN_ID 0   	// ID of the fan sensor child
    #define ERROR_ID 1 	// ID of the alert child 
    #define	HUM_ID 2 	//ID of the humidity child
    #define TEMP_ID 3 	//ID of the temp child
    
    #define BUTTON_PIN 2  				//Pin for the on/off button 
    // Set this to the pin you connected the DHT's data pin to
    #define DHT_DATA_PIN A0
    // Set this offset if the sensor has a permanent small offset to the real temperatures
    #define SENSOR_TEMP_OFFSET 0
    static const uint64_t UPDATE_INTERVAL = 60000;
    // Force sending an update of the temperature after n sensor reads, so a controller showing the
    // timestamp of the last update doesn't show something like 3 hours in the unlikely case, that
    // the value didn't change since;
    // i.e. the sensor would force sending an update every UPDATE_INTERVAL*FORCE_UPDATE_N_READS [ms]
    static const uint8_t FORCE_UPDATE_N_READS = 10;
    
    #define FAN_RELAY_PIN  A1  			//Pin number for relay that will control the fan
    #define COVER_CLOSE_LIMIT_PIN A2 	//Pin number for the "cover closed" limit switch
    #define COVER_OPEN_LIMIT_PIN A3 	//Pin number for the "cover open" limit switch
    #define COVER_CLOSE_PIN A4 			//Pin number for the "cover close" L298N motor control board
    #define COVER_OPEN_PIN A5			//Pin number for the "cover open" L298N motor control board
    #define FAN_POWER_PIN A6			//Pin number for the ACS712 monitoring the fan
    #define COVER_POWER_PIN A7			//Pin number for the ACS712 monitoring the cover motor
    
    #define TFT_DISPLAY_ON //Use to turn on/off display functionality (need to turn off for debugging because code is too large).
    
    #ifdef TFT_DISPLAY_ON
    // TFT display and SD card pins.  They will share the software SPI interface.
    #define SPI_SCK 8  //Also can be labeled CLK on display
    #define SPI_DI  4 //Labeled MISO on display
    #define SPI_DO  7  //Labeled MOSI on display
    //#define SD_CS   5  // Chip select line for SD card (not currently used)
    #define TFT_CS  3
    #define TFT_DC  6 //Labeled RS
    #define TFT_RST 0  // you can also connect this to the Arduino reset
    Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, SPI_DO, SPI_SCK, TFT_RST);
    #endif
    
    #define DEBUG_ON   // comment out to supress serial monitor output
    
    #ifdef DEBUG_ON
    #define DEBUG_PRINT(x)   Serial.print(x)
    #define DEBUG_PRINTLN(x) Serial.println(x)
    #define SERIAL_START(x)  Serial.begin(x)
    #else
    #define DEBUG_PRINT(x)
    #define DEBUG_PRINTLN(x)
    #define SERIAL_START(x)
    #endif
    
    #define RELAY_ON 1 //Switch to 0 if fan relay is off when it should be on
    #define RELAY_OFF 0 //Switch to 1 if fan relay is on when it should be off
    #define DWELL_TIME 50 //Time to wait between radio messages sent (helps prevent missed messages)
    #define closingStall 465 //The value of the ACS712 when the cover motor is stopped while closing. This value should be less than the normal operating power draw.
    #define openingStall 580 //The value of the ACS712 when the cover motor is stopped while opening.  This value should be greater than the normal operating power draw.
    #define coverLimitTime 37000 //Slightly over the time it takes for the cover to fully open/close in milliseconds.  This will prevent the cover motor from running indefinitely.
    
    //Fan power reading variables. You may need to adjust these depending on your ACS712 model and house voltage
    uint8_t mVperAmp = 69; //had to adjust for my sensor you may need to adjust yours a well // use 185 for 5A Module, 100 for 20A Module and 66 for 30A Module
    uint8_t houseVoltage = 220; //Voltage of your house wiring (110 or 220) 
    
    Bounce debouncerOnOff = Bounce();
    Bounce debouncerClosedState = Bounce();
    Bounce debouncerOpenState = Bounce();
    uint8_t fanButtonPrev = 0;
    uint8_t fanState = 0;
    uint8_t fanStatePrevious = 1;
    uint8_t fanRelayState;
    uint8_t coverMoving = 0;
    uint8_t	coverClosedState = LOW;
    uint8_t	coverOpenState = LOW;
    uint8_t errorState = 0; //Used to keep track of errors.  Can be reset by manually pushing button
    uint8_t fanPowerReading = 0;
    int coverPowerReading = 0;
    unsigned long currentMillis; //used for timers
    unsigned long powerReadMillis; //Used read power every second
    unsigned long powerUpdateMillis; //Used to update power usage on LCD and gateway
    unsigned long coverMillis;
    unsigned long dhtMillisPrev;
    unsigned long dhtDelay = 305000;	//5 minutes 5 seconds.  Offset is in case of power failure I don't want all my nodes reporting at the same time.
    unsigned long lastGetTime; //Used for getting time from gateway
    
    uint8_t lastSecond;
    uint8_t lastMinute;
    uint8_t lastHour;
    
    DHT dht;
    float lastTemp = 0;
    float lastHum = 0;
    uint8_t nNoUpdatesTemp;
    uint8_t nNoUpdatesHum;
    boolean metric = true; //Set to true if you use the metric system
    
    //Fan power reading variables.
    double Voltage = 0; //Voltage read from analog pin (used to calc power)
    double VRMS = 0;
    double AmpsRMS = 0;
    uint16_t wattTotal = 0; //Used to calculate the watts used for the last minute
    int wattAvg = 0;
    int wattAvgPrev = 0;
    uint8_t wattCount = 0; //Will be used to divide watts
    uint16_t pMaxValue = 0; // store max value here
    uint16_t pMinValue = 1024; // store min value here
    
    
    //MySensor gw;
    MyMessage msgFan(FAN_ID, V_STATUS);
    MyMessage msgFanPwr(FAN_ID, V_WATT);
    MyMessage msgError(ERROR_ID, V_TRIPPED);
    MyMessage msgHum(HUM_ID, V_HUM);
    MyMessage msgTemp(TEMP_ID, V_TEMP);
    
    void presentation()  
    { 
      sendSketchInfo(SKETCH_NAME, SKETCH_VERSION);
      present(FAN_ID, S_BINARY);
      wait(DWELL_TIME);
      present(ERROR_ID, S_MOTION);
      wait(DWELL_TIME);
      present(HUM_ID, S_HUM);
      wait(DWELL_TIME);
      present(TEMP_ID, S_TEMP);
      wait(DWELL_TIME);
      metric = getConfig().isMetric;
    }
    
    void setup()
    {
      delay(2000); //Allow time for sensors to power up
      
    requestTime();
      // Send the sketch version information to the gateway and Controller
    
    
      dht.setup(DHT_DATA_PIN);
        if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
        Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
      }
      // Sleep for the time of the minimum sampling period to give the sensor time to power up
      // (otherwise, timeout errors might occure for the first reading)
      sleep(dht.getMinimumSamplingPeriod());
    
      // Make sure relays are off when starting up
      digitalWrite(FAN_RELAY_PIN, RELAY_OFF);
      digitalWrite(COVER_OPEN_PIN, LOW);
      digitalWrite(COVER_CLOSE_PIN, LOW);
    
      // Set the pin mode
      pinMode(FAN_RELAY_PIN, OUTPUT);
      pinMode(COVER_OPEN_PIN, OUTPUT);
      pinMode(COVER_CLOSE_PIN, OUTPUT);
      pinMode(COVER_OPEN_LIMIT_PIN, INPUT_PULLUP);
      pinMode(COVER_CLOSE_LIMIT_PIN, INPUT_PULLUP);
      pinMode(BUTTON_PIN, INPUT_PULLUP); // Setup the on/off button and activate internal pull-up
    
      // After setting up the pin modes, setup debouncers
      debouncerOnOff.attach(BUTTON_PIN);
      debouncerOnOff.interval(50);
      debouncerOpenState.attach(COVER_OPEN_LIMIT_PIN);
      debouncerOpenState.interval(50);
      debouncerClosedState.attach(COVER_CLOSE_LIMIT_PIN);
      debouncerClosedState.interval(50);
    
      // Register all sensors to gw (they will be created as child devices)
    
    
      send(msgError.set(0)); // Reset Alert state
    
      //Check the cover slide limit switch values
      debouncerOpenState.update();
      coverOpenState = debouncerOpenState.read();
    
      debouncerClosedState.update();
      coverClosedState = debouncerClosedState.read();
    
      metric = getConfig().isMetric;
    
    unsigned long functionTimeout = millis();
      while (timeStatus() == timeNotSet && millis() - functionTimeout < 30000UL)
      {
        requestTime(); 
        DEBUG_PRINTLN(F("Getting Time"));
        wait(1000); // call once per second
        DEBUG_PRINTLN(F("."));
      }
    
    #ifdef TFT_DISPLAY_ON
      //**Note: I had a red tab LCD but the black tab setting worked the best for me
      // If your TFT's plastic wrap has a Black Tab, use the following:
      tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab
      // If your TFT's plastic wrap has a Red Tab, use the following:
      //tft.initR(INITR_REDTAB);   // initialize a ST7735R chip, red tab
      // If your TFT's plastic wrap has a Green Tab, use the following:
      //tft.initR(INITR_GREENTAB); // initialize a ST7735R chip, green tab
    
      //Initial Setup - Set state to Idle
      tft.drawLine(0, 7, 160, 7, tft.Color565(123, 123, 123)); //Setup
      tft.fillRect(0, 8, 160, 21, tft.Color565(80, 80, 80)); //Setup
      tft.drawLine(0, 29, 160, 29, tft.Color565(34, 34, 34)); //Setup
      tft.drawLine(0, 110, 160, 110, ST7735_WHITE); //Setup
      tft.fillRect(0, 111, 160, 43, tft.Color565(230, 230, 230)); //Setup
      tft.drawLine(0, 153, 160, 153, tft.Color565(170, 170, 170)); //Setup
    
      updateTime();
      updateTemp();
      updateHum();
    
    #endif
    
      currentMillis = millis();
      coverMillis = currentMillis;
    
      //Make sure the fan is off and the cover is closed when first powered on
      fanOff();
    }
    
    
    void loop()
    {
      // Force reading sensor, so it works also after sleep()
      dht.readSensor(true);
      
      currentMillis = millis(); //Set the current millis (used for timers)
    
      //Check the cover slide limit switch values
      debouncerOpenState.update();
      coverOpenState = debouncerOpenState.read();
    
      debouncerClosedState.update();
      coverClosedState = debouncerClosedState.read();
      //  DEBUG_PRINT(F("coverClosedState = "));
      //  DEBUG_PRINTLN(coverClosedState);
    
      //There is a spike in current when the motor is first turned on.  We need to stop reading for a short period so the motor doesn't immedately turn off
      if (currentMillis - coverMillis > 1500)
      {
        coverPowerReading = analogRead(COVER_POWER_PIN); //change back when sensor is attached
        //DEBUG_PRINT(F("coverPowerReading = "));
        //DEBUG_PRINTLN(coverPowerReading);
        if (coverPowerReading > closingStall && coverPowerReading < openingStall)
        {
          //Cover motor power draw is within limits
          coverPowerReading = 0;
        }
        else
        {
          //Cover motor power draw is over the limit.  Motor has stalled.
          coverPowerReading = 1;
        }
      }
    
      debouncerOnOff.update();
      uint8_t fanButton = debouncerOnOff.read(); // Get the update value
      //DEBUG_PRINTLN(fanButton);
      if (fanButton != fanButtonPrev && fanButton == 0) {
        if (coverMoving == 1)
        {
          //If the cover is already moving, change directions.
          fanStatePrevious = fanState;
          coverMoving = 0;
        }
        fanState = fanState ? 0 : 1;
        DEBUG_PRINT(F("fanState value changed to: "));
        DEBUG_PRINTLN(fanState);
        send(msgFan.set(fanState), true); // Send new state and request ack back
        errorState = 0;
        wait(DWELL_TIME);
        send(msgError.set(0)); // Reset Alert state
        coverMillis = currentMillis; //Set the millis (used to keep track of cover close/open times)
      }
      fanButtonPrev = fanButton;
    
      if (fanState != fanStatePrevious && fanState == 0 && errorState == 0)
      {
        fanOff();
      }
      if (fanState != fanStatePrevious && fanState == 1 && errorState == 0)
      {
        fanOn();
      }
    
      if (currentMillis - dhtMillisPrev > dhtDelay)
      {
        float temperature = dht.getTemperature();
    
        if (isnan(temperature))
        {
          DEBUG_PRINTLN(F("Failed reading temperature from DHT"));
        }
        else
        {
          if (!metric)
          {
            temperature = dht.toFahrenheit(temperature);
          }
          if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS)
          {
            lastTemp = temperature;
            send(msgTemp.set(temperature, 1));
            wait(DWELL_TIME);
    #ifdef TFT_DISPLAY_ON
            updateTemp();
    #endif
            DEBUG_PRINT(F("Temperature is: "));
            DEBUG_PRINTLN(temperature);
          }
        }
        float humidity = dht.getHumidity();;
        if (isnan(humidity))
        {
          DEBUG_PRINTLN(F("Failed reading humidity from DHT"));
        } else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS)
        {
          lastHum = humidity;
          nNoUpdatesHum = 0;
          send(msgHum.set(humidity, 1));
          wait(DWELL_TIME);
    #ifdef TFT_DISPLAY_ON
          updateHum();
    #endif
    
          DEBUG_PRINT(F("Humidity is: "));
          DEBUG_PRINTLN(humidity);
        } else {
        // Increase no update counter if the humidity stayed the same
        nNoUpdatesHum++;
      }
        dhtMillisPrev = currentMillis;
      }
    
      /*
        Check power usage here
        I want to check it every second then send it every minute (when changed) to the gateway and LCD
        In the "every second" check it should get a running average so it would divide by the number of seconds
      */
    
      if (currentMillis - powerReadMillis < 1000)
      {
        //Read power every second
        uint16_t readValue = analogRead(FAN_POWER_PIN);
        //DEBUG_PRINT(F("readValue: "));
        //DEBUG_PRINTLN(readValue);
    
        // see if you have a new pMaxValue
        if (readValue > pMaxValue)
        {
          /*record the maximum sensor value*/
          pMaxValue = readValue;
        }
        if (readValue < pMinValue)
        {
          /*record the maximum sensor value*/
          pMinValue = readValue;
        }
      }
      else
      {
        //Calulate power usage and update gateway if necessary
        // Subtract min from max
        Voltage = ((pMaxValue - pMinValue) * 5.0) / 1024.0;
        VRMS = (Voltage / 2.0) * 0.707;
        AmpsRMS = (VRMS * 1000) / mVperAmp;
    
        if (AmpsRMS < .15) //filter out low readings when fan is off
        {
          AmpsRMS = 0;
        }
        DEBUG_PRINT(F("Amps RMS: "));
        DEBUG_PRINT(AmpsRMS);
    
        wattTotal += houseVoltage * AmpsRMS;
        DEBUG_PRINT(F(".  Watt Total: "));
        DEBUG_PRINT(wattTotal);
        wattCount ++;
        DEBUG_PRINT(F(".  Watt Count: "));
        DEBUG_PRINTLN(wattCount);
        powerReadMillis = currentMillis;
        //Reset max and min values
        pMaxValue = 0;
        pMinValue = 1024;
    
        //Update fanPowerReading to make sure the fan is off before closing the cover
        fanPowerReading = AmpsRMS > 1 ? 1 : 0;
        DEBUG_PRINT(F("fanPowerReading: "));
        DEBUG_PRINTLN(fanPowerReading);
    
        //Update Gateway and LCD every minute if necessary
        if (currentMillis - powerUpdateMillis > 60000)
        {
          //We don't want to flood the gateway with updates so if the last reading was close to the current one we don't need to send the new reading
          wattAvg = wattTotal / wattCount;
          DEBUG_PRINT(F("Watt Average: "));
          DEBUG_PRINTLN(wattAvg);
    
          //Only update if last usage was different by 2 watts
          if (wattAvgPrev - wattAvg > 2 || wattAvg - wattAvgPrev > 2)
          {
            //Send to gateway
            send(msgFanPwr.set(wattAvg));
    
    #ifdef TFT_DISPLAY_ON
            if (fanPowerReading == 1)
            {
              //Update LCD if running
              tft.setTextColor(ST7735_WHITE, tft.Color565(53, 47, 125));
              tft.setFont();
              tft.setTextSize(1);
              tft.setCursor(5, 95);
              tft.print("Watts: "); //First line of text 20 characters max
              tft.print(wattAvg);
              tft.print("  ");
              DEBUG_PRINT(F("Watts update display: "));
              DEBUG_PRINTLN(wattAvg);
            }
    
    
    #endif
    
          }
          wattAvgPrev = wattAvg;
    
          //Reset watt trackers
          wattTotal = 0;
          wattCount = 0;
    
          powerUpdateMillis = currentMillis;
    
          //Using this if statement to update the time every minute
    #ifdef TFT_DISPLAY_ON
          //Update Time on Display every minute
          updateTime();
    #endif
        }
      }
    
      if (currentMillis - lastGetTime >= 3600000UL) // updates clock time and gets zone times from gateway once every hour
      {
        DEBUG_PRINTLN(F("Requesting time and valve data from Gateway..."));
    
        lastGetTime = millis();
      }
    }
    
    void fanOff() {
      /*
         1. Turn off the fan
         2. Make sure it's off before we start closing the cover
         3. Close cover
            a. Start a timer for how long the closing should take
            b. Stop the motor when the limit switch is hit
         4. Ensure the limit switch has been pressed and the timer didn't run out.  If it did send an error message (via motion sensor).
         5. Send "off" message to gateway/controller
      */
    
      //DEBUG_PRINTLN(F("In the fanOff function"));
      if (fanRelayState == RELAY_ON)
      {
        DEBUG_PRINTLN(F("Turning off fan"));
        //Turn off fan and set fan relay state to 0
        digitalWrite(FAN_RELAY_PIN, RELAY_OFF);
        fanRelayState = RELAY_OFF;
    
      }
      if (currentMillis - coverMillis < coverLimitTime)
      {
        if (coverPowerReading == 0)
        {
          //Make sure the fan is off before closing the cover to prevent damage to the cover and fan
          if (fanPowerReading == 0)
          {
            //Start closing the cover
            //Set the close pin on the L298N board to high
    
            if (coverMoving == 0)
            {
              DEBUG_PRINTLN(F("Closing Cover"));
              digitalWrite(COVER_CLOSE_PIN, HIGH);
              //Set COVER_OPEN_PIN to low just to be safe
              digitalWrite(COVER_OPEN_PIN, LOW);
    
              //Update the LCD with "Closing" status message
    #ifdef TFT_DISPLAY_ON
              tft.setTextColor(ST7735_WHITE, tft.Color565(53, 47, 125));
              tft.setFont();
              tft.setTextSize(1);
              tft.setCursor(5, 95);
              tft.print("CLOSING COVER     "); //First line of text 20 characters max
    #endif
              coverMoving = 1;
            }
    
            if (coverClosedState == LOW)
            {
              //The cover is closed.  Stop motor and send status to gateway.
              digitalWrite(COVER_CLOSE_PIN, LOW);
              fanStatePrevious = fanState;
              send(msgFan.set(fanState), true); // Send new state with Ack
              coverMoving = 0;
    
    #ifdef TFT_DISPLAY_ON
              //Update LCD
              wait(200); //Wait for radio SPI to stop (otherwise display is garbled)
              updateTFTStatus(0); //Set status to idle state
    #endif
            }
          }
        }
        else
        {
          //Cover motor is using too much power.  Stop everything to avoid damage.
          DEBUG_PRINTLN(F("The slide motor is using too much power!"));
          digitalWrite(COVER_CLOSE_PIN, LOW);
          digitalWrite(COVER_OPEN_PIN, LOW);
          errorState = 1; //Set the error state so it doesn't keep trying to close
          send(msgError.set(1)); // Send alert state to gateway
    #ifdef TFT_DISPLAY_ON
          //Update LCD
          updateTFTStatus(2); //Set status to error state
          errorOvercurrent(); //More detailed error message
    #endif
        }
      }
      else
      {
        /*Things have taken too long there must be an error.  Print it out to the LCD and send trigger to gateway
          Possible errors could be:
          Fan did not shut off.
          Cover did not fully close in time (slide jam, motor slip etc.)
          Over current in cover motor (jammed?)
        */
        //Send commands to stop everything to avoid damage.
        DEBUG_PRINTLN(F("Cover time exceeded"));
        digitalWrite(FAN_RELAY_PIN, RELAY_OFF);
        digitalWrite(COVER_CLOSE_PIN, LOW);
        digitalWrite(COVER_OPEN_PIN, LOW);
        errorState = 1; //Set the error state so it doesn't keep trying to close
        send(msgError.set(1)); // Send alert state to gateway
    
    #ifdef TFT_DISPLAY_ON
        //Update LCD
        updateTFTStatus(2); //Set status to error state
        errorTime(); //Write more detailed error to LCD
    #endif
      }
    }
    
    void fanOn() {
    
      /*
        1. Open the cover
          a. Start a timer to keep track of how long the cover has been opening 
          b. Stop the motor when the limit switch is hit
        2. Ensure the limit switch has been pressed and the timer didn't run out.  If it did send an error message.
        3. Start the fan
        4. Send "on" message to gateway/controller
      */
    
      if (currentMillis - coverMillis < coverLimitTime)
      {
        if (coverPowerReading == 0)
        {
          //Start opening the cover
          if (coverMoving == 0)
          {
            DEBUG_PRINTLN(F("Opening Cover"));
    
            //Set COVER_CLOSE_PIN to low just to be safe
            digitalWrite(COVER_CLOSE_PIN, LOW);
            digitalWrite(COVER_OPEN_PIN, HIGH);
            coverMoving = 1;
    
    #ifdef TFT_DISPLAY_ON
            wait(200); //Wait for radio communication to stop (otherwise display is garbled because of SPI conflicts)
            //Update LCD
            updateTFTStatus(1); //Set status to idle state
    #endif
    
          }
    
          if (coverOpenState == LOW)
          {
            //The cover is open.  Stop motor and send status to gateway.
            digitalWrite(COVER_OPEN_PIN, LOW);
            fanStatePrevious = fanState;
            //Turn on Fan
            digitalWrite(FAN_RELAY_PIN, RELAY_ON);
            fanRelayState = RELAY_ON;
            coverMoving = 0;
          }
        }
        else
        {
          //Cover motor is using too much power.  Stop everything to avoid damage.
          DEBUG_PRINTLN(F("The cover motor is using too much power!"));
          digitalWrite(COVER_CLOSE_PIN, LOW);
          digitalWrite(COVER_OPEN_PIN, LOW);
          errorState = 1; //Set the error state so it doesn't keep trying to close
          send(msgError.set(1)); // Send alert state to gateway
    #ifdef TFT_DISPLAY_ON
          //Update LCD
          updateTFTStatus(2); //Set status to error state
          errorOvercurrent(); //More detailed error message
    #endif
        }
      }
      else
      {
        /*Things have taken too long there must be an error.  Print it out to the LCD and send trigger to gateway
          Possible errors could be:
          Cover did not fully open in time (slide jam, motor slip etc.)
          Overcurrent in cover motor (jammed?)
        */
        //Send commands to stop everything to avoid damage.
        DEBUG_PRINTLN(F("Cover time exceeded"));
        digitalWrite(COVER_CLOSE_PIN, LOW);
        digitalWrite(COVER_OPEN_PIN, LOW);
        errorState = 1; //Set the error state so it doesn't keep trying to close
    
    #ifdef TFT_DISPLAY_ON
        //Update LCD
        updateTFTStatus(2); //Set status to error state
        tft.setCursor(5, 90);
        //More detailed error message
        errorTime();
    #endif
      }
    
    }
    
    
    void receive(const MyMessage & message) {
      // We only expect one type of message from controller. But we better check anyway.
      if (message.isAck()) {
        DEBUG_PRINTLN(F("This is an ack from gateway"));
      }
    
      if (message.type == V_LIGHT && !message.isAck()) {
        // Change relay state
        fanState = message.getBool();
        if (coverMoving == 1)
        {
          //If the cover is already moving, check to see if we need to change directions
          DEBUG_PRINT(F("Cover is moving"));
          if (fanState == fanStatePrevious)
          {
            //We need to change directions
            fanStatePrevious = fanState ? 0 : 1;
            coverMoving = 0;
          }
        }
        coverMillis = millis(); //Set the millis (used to keep track of cover close/open times)
    
        // Write some debug info
        DEBUG_PRINT(F("Incoming change for sensor:"));
        DEBUG_PRINT(message.sensor);
        DEBUG_PRINT(F(", New status: "));
        DEBUG_PRINTLN(fanState);
      }
    }
    
    // This is called when a new time value was received
    void receiveTime(unsigned long time) {
      // Ok, set incoming time 
      setTime(time);
    }
    
    #ifdef TFT_DISPLAY_ON
    void updateTFTStatus(uint8_t bgStat)
    {
      //bgStat: 0 = "Idle", 1 = "Running", 2 = "Error"
      //Idle Color = 37, 125, 20
      //Running Color = 53, 47, 125
      //Error Color = 155, 26, 26
    
      uint8_t r, g, b;
      const char *displayStatus[] = {
        "Idle", "Running", "Error"
      };
      if (bgStat == 0)
      {
        //Idle
        r = 37;
        g = 125;
        b = 20;
      }
      else if (bgStat == 1)
      {
        //Running
        r = 53;
        g = 47;
        b = 125;
      }
      else
      {
        //Error
        r = 155;
        g = 26;
        b = 26;
      }
    
      tft.fillRect(0, 0, 160, 7, tft.Color565(r, g, b));
      tft.fillRect(0, 30, 160, 80, tft.Color565(r, g, b));
      tft.fillRect(0, 154, 160, 6, tft.Color565(r, g, b));
    
      tft.setCursor(5, 40);
      tft.setTextColor(ST7735_WHITE);
      tft.setTextSize(1);
      tft.println("Status");
    
      tft.setCursor(5, 65);
      tft.setTextColor(ST7735_WHITE);
      tft.setFont();
      //tft.setTextSize(3);
      tft.setTextSize(bgStat == 1 ? 2 : 3); //The word "Running" doesn't fit with text size 3.
      tft.println(displayStatus[bgStat]);
    
    }
    void errorOvercurrent()
    {
      tft.setCursor(5, 90);
      tft.setTextColor(ST7735_WHITE);
      tft.setFont();
      tft.setTextSize(1);
      tft.println("Motor overcurrent"); //First line of text 20 characters max
      tft.setCursor(5, 101);
      tft.println("Check cover slide"); //Second line of text 20 characters max
    }
    void errorTime()
    {
      tft.setCursor(5, 90);
      tft.setTextColor(ST7735_WHITE);
      tft.setFont();
      tft.setTextSize(1);
      tft.println("Time exceeded"); //First line of text 20 characters max
      tft.setCursor(5, 100);
      tft.println("Check cover slide"); //Second line of text 20 characters max
    }
    void updateTime()
    {
      //Update Time
      tft.setCursor(5, 17);
      tft.setTextColor(ST7735_WHITE, tft.Color565(80, 80, 80));
      tft.setTextSize(1);
      tft.print(hourFormat12());
      tft.print(minute() < 10 ? F(":0") : F(":"));
      tft.print(minute());
      tft.print(isAM() ? F("am") : F("pm"));
      tft.print(month() < 10 ? F(" 0") : F(" "));
      tft.print(month());
      tft.print(day() < 10 ? F("/0") : F("/"));
      tft.print(day());
      tft.print(F("/"));
      tft.print(year() % 100);
      tft.print(F(" "));
    }
    void updateTemp()
    {
      //Update Temperature
      tft.setCursor(5, 120);
      tft.setTextColor(tft.Color565(80, 80, 80), tft.Color565(230, 230, 230));
      tft.setTextSize(1);
      tft.print("Temp: ");
      tft.print(lastTemp, 1);
      tft.print((char)247);
      tft.print(" ");
    }
    void updateHum()
    {
      //Update Humidity
      tft.setCursor(5, 140);
      tft.setTextColor(tft.Color565(80, 80, 80), tft.Color565(230, 230, 230));
      tft.setTextSize(1);
      tft.print("Humidity: ");
      tft.print(lastHum, 1);
      tft.print("% ");
    }
    #endif
    


  • Small progress. It can be seen now in Domoticz, however DHT11 not working.



  • Excellent project. However, have you considered any possibility of condensation of humid air in the attic? At least where I live, that would become a problem.



  • In my case the air will go outside attic (i have a shaft for ventilation).


  • Admin

    @Nuubi You need to have proper venting in your attic to use a fan like this. If you have the venting the humidity should not be a problem because it will pull fresh air from the outside through your house and out the attic vents. I don't live in a high humidity area so maybe the venting in attics is different there though.


  • Admin

    @rechin304 said:

    Small progress. It can be seen now in Domoticz, however DHT11 not working.

    Are you sure you have the wiring correct? Does it show in the serial monitor but not Domoticz or neither place?



  • Hi @petewill , i do not see anything on serial monitor related to temp or hum, and yes is connected correctly on A0, everything now works ok, except temp and hum. I do not have yet an DHT22 to test.


  • Admin

    @rechin304 Strange. Did you enable debugging in the code (uncomment this line "//#define DEBUG_ON")? Without that line enabled you won't see anything in the serial monitor.



  • Yes, debug is enabled, see the code adapted for v2, below. I have build separate node for testing only temp and hum and no data is coming too (several DHT11 used).. i used example that come from library. (example used is this https://github.com/mysensors/MySensorsArduinoExamples/blob/master/examples/DhtTemperatureAndHumiditySensor/DhtTemperatureAndHumiditySensor.ino )

    @rechin304 said:

    This is hat i made until now. I have two issues:

    1. DHT11 is not working (no temp or hum is shown)
    2. I use Domoticz as controller and i do not see the node connecting to it, even the clock is sync with gateway. Gateway is version 2. So please if you have some time to look at the code your help be highly appreciated. Thanks.
    /**
       The MySensors Arduino library handles the wireless radio link and protocol
       between your home built sensors/actuators and HA controller of choice.
       The sensors forms a self healing radio network with optional repeaters. Each
       repeater and gateway builds a routing tables in EEPROM which keeps track of the
       network topology allowing messages to be routed to nodes.
    
       Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
       Copyright (C) 2013-2015 Sensnology AB
       Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
    
       Documentation: http://www.mysensors.org
       Support Forum: http://forum.mysensors.org
    
       This program is free software; you can redistribute it and/or
       modify it under the terms of the GNU General Public License
       version 2 as published by the Free Software Foundation.
    
       Power monitoring code adapted from: http://henrysbench.capnfatz.com/henrys-bench/arduino-current-measurements/acs712-arduino-ac-current-tutorial/
     *******************************
    
       REVISION HISTORY
       Version 1.0 - Initial code
       Version 2.0 - Changed for Mysensors v2
       
       DESCRIPTION
       The code below will run a MySensors whole house fan with wall mounted lcd control panel.  The fan is installed in the attic and an insulated cover will 
       open/close to conserve energy.  The project cost a little over $300 US.  A comparable commercial product costs around $1200.
       
       FEATURES
       - Physical button switch to control on/off in case there are ever issues with radio communications.  
       - DHT22 sensor for temp/humidity monitoring in the attic
       - LCD screen displays status, temp/humidity, errors & date/time
       - If an error occurs a message is sent to the gateway
       - When the unit looses power it will make sure the cover is closed and the fan is off after power is restored.
       - Safety Features
    	- The cover will wait to close until power has been shut off to the fan
    	- Customizable over current protection on the cover motor (automatically shut off if the cover gets stuck)
    	- Customizable cover close time limit (if it slips out off the coupling the motor won't run indefinitely)
    
       NOTE
       This program is too large to run with all debugging and the display enabled.
       To upload either comment out "#define DEBUG_ON" in the code below or comment out
       "#define DEBUG" in MyConfig.h in the MySensors library.
       For troubleshooting "#ifdef TFT_DISPLAY_ON" can be commented out so all debugging
       messages can be output to the serial monitor
    
    */
    // Enable debug prints to serial monitor
    #define MY_DEBUG
    // Enable and select radio type attached
    #define MY_RADIO_NRF24
    #define MY_RF24_PA_LEVEL RF24_PA_MAX
    
    #include <MySensors.h>
    #include <SPI.h>
    #include <Bounce2.h>
    #include <DHT.h>
    #include <Adafruit_GFX.h>    // Core graphics library
    #include <Adafruit_ST7735.h> // Hardware-specific library
    #include <Time.h>
    #include <TimeLib.h>
    
    //#define NODE_ID AUTO //or set to AUTO to have the gateway assign an ID
    
    //#define NODE_REPEAT false //change to true to set to a repeating/relaying node
    
    
    #define MY_NODE_ID AUTO  //set to AUTO to have the gateway assign an ID
    #define SKETCH_NAME "House Fan Mysensors v2"
    #define SKETCH_VERSION "2.1"
    
    #define FAN_ID 0   	// ID of the fan sensor child
    #define ERROR_ID 1 	// ID of the alert child 
    #define	HUM_ID 2 	//ID of the humidity child
    #define TEMP_ID 3 	//ID of the temp child
    
    #define BUTTON_PIN 2  				//Pin for the on/off button 
    // Set this to the pin you connected the DHT's data pin to
    #define DHT_DATA_PIN A0
    // Set this offset if the sensor has a permanent small offset to the real temperatures
    #define SENSOR_TEMP_OFFSET 0
    static const uint64_t UPDATE_INTERVAL = 60000;
    // Force sending an update of the temperature after n sensor reads, so a controller showing the
    // timestamp of the last update doesn't show something like 3 hours in the unlikely case, that
    // the value didn't change since;
    // i.e. the sensor would force sending an update every UPDATE_INTERVAL*FORCE_UPDATE_N_READS [ms]
    static const uint8_t FORCE_UPDATE_N_READS = 10;
    
    #define FAN_RELAY_PIN  A1  			//Pin number for relay that will control the fan
    #define COVER_CLOSE_LIMIT_PIN A2 	//Pin number for the "cover closed" limit switch
    #define COVER_OPEN_LIMIT_PIN A3 	//Pin number for the "cover open" limit switch
    #define COVER_CLOSE_PIN A4 			//Pin number for the "cover close" L298N motor control board
    #define COVER_OPEN_PIN A5			//Pin number for the "cover open" L298N motor control board
    #define FAN_POWER_PIN A6			//Pin number for the ACS712 monitoring the fan
    #define COVER_POWER_PIN A7			//Pin number for the ACS712 monitoring the cover motor
    
    #define TFT_DISPLAY_ON //Use to turn on/off display functionality (need to turn off for debugging because code is too large).
    
    #ifdef TFT_DISPLAY_ON
    // TFT display and SD card pins.  They will share the software SPI interface.
    #define SPI_SCK 8  //Also can be labeled CLK on display
    #define SPI_DI  4 //Labeled MISO on display
    #define SPI_DO  7  //Labeled MOSI on display
    //#define SD_CS   5  // Chip select line for SD card (not currently used)
    #define TFT_CS  3
    #define TFT_DC  6 //Labeled RS
    #define TFT_RST 0  // you can also connect this to the Arduino reset
    Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, SPI_DO, SPI_SCK, TFT_RST);
    #endif
    
    #define DEBUG_ON   // comment out to supress serial monitor output
    
    #ifdef DEBUG_ON
    #define DEBUG_PRINT(x)   Serial.print(x)
    #define DEBUG_PRINTLN(x) Serial.println(x)
    #define SERIAL_START(x)  Serial.begin(x)
    #else
    #define DEBUG_PRINT(x)
    #define DEBUG_PRINTLN(x)
    #define SERIAL_START(x)
    #endif
    
    #define RELAY_ON 1 //Switch to 0 if fan relay is off when it should be on
    #define RELAY_OFF 0 //Switch to 1 if fan relay is on when it should be off
    #define DWELL_TIME 50 //Time to wait between radio messages sent (helps prevent missed messages)
    #define closingStall 465 //The value of the ACS712 when the cover motor is stopped while closing. This value should be less than the normal operating power draw.
    #define openingStall 580 //The value of the ACS712 when the cover motor is stopped while opening.  This value should be greater than the normal operating power draw.
    #define coverLimitTime 37000 //Slightly over the time it takes for the cover to fully open/close in milliseconds.  This will prevent the cover motor from running indefinitely.
    
    //Fan power reading variables. You may need to adjust these depending on your ACS712 model and house voltage
    uint8_t mVperAmp = 69; //had to adjust for my sensor you may need to adjust yours a well // use 185 for 5A Module, 100 for 20A Module and 66 for 30A Module
    uint8_t houseVoltage = 220; //Voltage of your house wiring (110 or 220) 
    
    Bounce debouncerOnOff = Bounce();
    Bounce debouncerClosedState = Bounce();
    Bounce debouncerOpenState = Bounce();
    uint8_t fanButtonPrev = 0;
    uint8_t fanState = 0;
    uint8_t fanStatePrevious = 1;
    uint8_t fanRelayState;
    uint8_t coverMoving = 0;
    uint8_t	coverClosedState = LOW;
    uint8_t	coverOpenState = LOW;
    uint8_t errorState = 0; //Used to keep track of errors.  Can be reset by manually pushing button
    uint8_t fanPowerReading = 0;
    int coverPowerReading = 0;
    unsigned long currentMillis; //used for timers
    unsigned long powerReadMillis; //Used read power every second
    unsigned long powerUpdateMillis; //Used to update power usage on LCD and gateway
    unsigned long coverMillis;
    unsigned long dhtMillisPrev;
    unsigned long dhtDelay = 305000;	//5 minutes 5 seconds.  Offset is in case of power failure I don't want all my nodes reporting at the same time.
    unsigned long lastGetTime; //Used for getting time from gateway
    
    uint8_t lastSecond;
    uint8_t lastMinute;
    uint8_t lastHour;
    
    DHT dht;
    float lastTemp = 0;
    float lastHum = 0;
    uint8_t nNoUpdatesTemp;
    uint8_t nNoUpdatesHum;
    boolean metric = true; //Set to true if you use the metric system
    
    //Fan power reading variables.
    double Voltage = 0; //Voltage read from analog pin (used to calc power)
    double VRMS = 0;
    double AmpsRMS = 0;
    uint16_t wattTotal = 0; //Used to calculate the watts used for the last minute
    int wattAvg = 0;
    int wattAvgPrev = 0;
    uint8_t wattCount = 0; //Will be used to divide watts
    uint16_t pMaxValue = 0; // store max value here
    uint16_t pMinValue = 1024; // store min value here
    
    
    //MySensor gw;
    MyMessage msgFan(FAN_ID, V_STATUS);
    MyMessage msgFanPwr(FAN_ID, V_WATT);
    MyMessage msgError(ERROR_ID, V_TRIPPED);
    MyMessage msgHum(HUM_ID, V_HUM);
    MyMessage msgTemp(TEMP_ID, V_TEMP);
    
    void presentation()  
    { 
      sendSketchInfo(SKETCH_NAME, SKETCH_VERSION);
      present(FAN_ID, S_BINARY);
      wait(DWELL_TIME);
      present(ERROR_ID, S_MOTION);
      wait(DWELL_TIME);
      present(HUM_ID, S_HUM);
      wait(DWELL_TIME);
      present(TEMP_ID, S_TEMP);
      wait(DWELL_TIME);
      metric = getConfig().isMetric;
    }
    
    void setup()
    {
      delay(2000); //Allow time for sensors to power up
      
    requestTime();
      // Send the sketch version information to the gateway and Controller
    
    
      dht.setup(DHT_DATA_PIN);
        if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
        Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
      }
      // Sleep for the time of the minimum sampling period to give the sensor time to power up
      // (otherwise, timeout errors might occure for the first reading)
      sleep(dht.getMinimumSamplingPeriod());
    
      // Make sure relays are off when starting up
      digitalWrite(FAN_RELAY_PIN, RELAY_OFF);
      digitalWrite(COVER_OPEN_PIN, LOW);
      digitalWrite(COVER_CLOSE_PIN, LOW);
    
      // Set the pin mode
      pinMode(FAN_RELAY_PIN, OUTPUT);
      pinMode(COVER_OPEN_PIN, OUTPUT);
      pinMode(COVER_CLOSE_PIN, OUTPUT);
      pinMode(COVER_OPEN_LIMIT_PIN, INPUT_PULLUP);
      pinMode(COVER_CLOSE_LIMIT_PIN, INPUT_PULLUP);
      pinMode(BUTTON_PIN, INPUT_PULLUP); // Setup the on/off button and activate internal pull-up
    
      // After setting up the pin modes, setup debouncers
      debouncerOnOff.attach(BUTTON_PIN);
      debouncerOnOff.interval(50);
      debouncerOpenState.attach(COVER_OPEN_LIMIT_PIN);
      debouncerOpenState.interval(50);
      debouncerClosedState.attach(COVER_CLOSE_LIMIT_PIN);
      debouncerClosedState.interval(50);
    
      // Register all sensors to gw (they will be created as child devices)
    
    
      send(msgError.set(0)); // Reset Alert state
    
      //Check the cover slide limit switch values
      debouncerOpenState.update();
      coverOpenState = debouncerOpenState.read();
    
      debouncerClosedState.update();
      coverClosedState = debouncerClosedState.read();
    
      metric = getConfig().isMetric;
    
    unsigned long functionTimeout = millis();
      while (timeStatus() == timeNotSet && millis() - functionTimeout < 30000UL)
      {
        requestTime(); 
        DEBUG_PRINTLN(F("Getting Time"));
        wait(1000); // call once per second
        DEBUG_PRINTLN(F("."));
      }
    
    #ifdef TFT_DISPLAY_ON
      //**Note: I had a red tab LCD but the black tab setting worked the best for me
      // If your TFT's plastic wrap has a Black Tab, use the following:
      tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab
      // If your TFT's plastic wrap has a Red Tab, use the following:
      //tft.initR(INITR_REDTAB);   // initialize a ST7735R chip, red tab
      // If your TFT's plastic wrap has a Green Tab, use the following:
      //tft.initR(INITR_GREENTAB); // initialize a ST7735R chip, green tab
    
      //Initial Setup - Set state to Idle
      tft.drawLine(0, 7, 160, 7, tft.Color565(123, 123, 123)); //Setup
      tft.fillRect(0, 8, 160, 21, tft.Color565(80, 80, 80)); //Setup
      tft.drawLine(0, 29, 160, 29, tft.Color565(34, 34, 34)); //Setup
      tft.drawLine(0, 110, 160, 110, ST7735_WHITE); //Setup
      tft.fillRect(0, 111, 160, 43, tft.Color565(230, 230, 230)); //Setup
      tft.drawLine(0, 153, 160, 153, tft.Color565(170, 170, 170)); //Setup
    
      updateTime();
      updateTemp();
      updateHum();
    
    #endif
    
      currentMillis = millis();
      coverMillis = currentMillis;
    
      //Make sure the fan is off and the cover is closed when first powered on
      fanOff();
    }
    
    
    void loop()
    {
      // Force reading sensor, so it works also after sleep()
      dht.readSensor(true);
      
      currentMillis = millis(); //Set the current millis (used for timers)
    
      //Check the cover slide limit switch values
      debouncerOpenState.update();
      coverOpenState = debouncerOpenState.read();
    
      debouncerClosedState.update();
      coverClosedState = debouncerClosedState.read();
      //  DEBUG_PRINT(F("coverClosedState = "));
      //  DEBUG_PRINTLN(coverClosedState);
    
      //There is a spike in current when the motor is first turned on.  We need to stop reading for a short period so the motor doesn't immedately turn off
      if (currentMillis - coverMillis > 1500)
      {
        coverPowerReading = analogRead(COVER_POWER_PIN); //change back when sensor is attached
        //DEBUG_PRINT(F("coverPowerReading = "));
        //DEBUG_PRINTLN(coverPowerReading);
        if (coverPowerReading > closingStall && coverPowerReading < openingStall)
        {
          //Cover motor power draw is within limits
          coverPowerReading = 0;
        }
        else
        {
          //Cover motor power draw is over the limit.  Motor has stalled.
          coverPowerReading = 1;
        }
      }
    
      debouncerOnOff.update();
      uint8_t fanButton = debouncerOnOff.read(); // Get the update value
      //DEBUG_PRINTLN(fanButton);
      if (fanButton != fanButtonPrev && fanButton == 0) {
        if (coverMoving == 1)
        {
          //If the cover is already moving, change directions.
          fanStatePrevious = fanState;
          coverMoving = 0;
        }
        fanState = fanState ? 0 : 1;
        DEBUG_PRINT(F("fanState value changed to: "));
        DEBUG_PRINTLN(fanState);
        send(msgFan.set(fanState), true); // Send new state and request ack back
        errorState = 0;
        wait(DWELL_TIME);
        send(msgError.set(0)); // Reset Alert state
        coverMillis = currentMillis; //Set the millis (used to keep track of cover close/open times)
      }
      fanButtonPrev = fanButton;
    
      if (fanState != fanStatePrevious && fanState == 0 && errorState == 0)
      {
        fanOff();
      }
      if (fanState != fanStatePrevious && fanState == 1 && errorState == 0)
      {
        fanOn();
      }
    
      if (currentMillis - dhtMillisPrev > dhtDelay)
      {
        float temperature = dht.getTemperature();
    
        if (isnan(temperature))
        {
          DEBUG_PRINTLN(F("Failed reading temperature from DHT"));
        }
        else
        {
          if (!metric)
          {
            temperature = dht.toFahrenheit(temperature);
          }
          if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS)
          {
            lastTemp = temperature;
            send(msgTemp.set(temperature, 1));
            wait(DWELL_TIME);
    #ifdef TFT_DISPLAY_ON
            updateTemp();
    #endif
            DEBUG_PRINT(F("Temperature is: "));
            DEBUG_PRINTLN(temperature);
          }
        }
        float humidity = dht.getHumidity();;
        if (isnan(humidity))
        {
          DEBUG_PRINTLN(F("Failed reading humidity from DHT"));
        } else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS)
        {
          lastHum = humidity;
          nNoUpdatesHum = 0;
          send(msgHum.set(humidity, 1));
          wait(DWELL_TIME);
    #ifdef TFT_DISPLAY_ON
          updateHum();
    #endif
    
          DEBUG_PRINT(F("Humidity is: "));
          DEBUG_PRINTLN(humidity);
        } else {
        // Increase no update counter if the humidity stayed the same
        nNoUpdatesHum++;
      }
        dhtMillisPrev = currentMillis;
      }
    
      /*
        Check power usage here
        I want to check it every second then send it every minute (when changed) to the gateway and LCD
        In the "every second" check it should get a running average so it would divide by the number of seconds
      */
    
      if (currentMillis - powerReadMillis < 1000)
      {
        //Read power every second
        uint16_t readValue = analogRead(FAN_POWER_PIN);
        //DEBUG_PRINT(F("readValue: "));
        //DEBUG_PRINTLN(readValue);
    
        // see if you have a new pMaxValue
        if (readValue > pMaxValue)
        {
          /*record the maximum sensor value*/
          pMaxValue = readValue;
        }
        if (readValue < pMinValue)
        {
          /*record the maximum sensor value*/
          pMinValue = readValue;
        }
      }
      else
      {
        //Calulate power usage and update gateway if necessary
        // Subtract min from max
        Voltage = ((pMaxValue - pMinValue) * 5.0) / 1024.0;
        VRMS = (Voltage / 2.0) * 0.707;
        AmpsRMS = (VRMS * 1000) / mVperAmp;
    
        if (AmpsRMS < .15) //filter out low readings when fan is off
        {
          AmpsRMS = 0;
        }
        DEBUG_PRINT(F("Amps RMS: "));
        DEBUG_PRINT(AmpsRMS);
    
        wattTotal += houseVoltage * AmpsRMS;
        DEBUG_PRINT(F(".  Watt Total: "));
        DEBUG_PRINT(wattTotal);
        wattCount ++;
        DEBUG_PRINT(F(".  Watt Count: "));
        DEBUG_PRINTLN(wattCount);
        powerReadMillis = currentMillis;
        //Reset max and min values
        pMaxValue = 0;
        pMinValue = 1024;
    
        //Update fanPowerReading to make sure the fan is off before closing the cover
        fanPowerReading = AmpsRMS > 1 ? 1 : 0;
        DEBUG_PRINT(F("fanPowerReading: "));
        DEBUG_PRINTLN(fanPowerReading);
    
        //Update Gateway and LCD every minute if necessary
        if (currentMillis - powerUpdateMillis > 60000)
        {
          //We don't want to flood the gateway with updates so if the last reading was close to the current one we don't need to send the new reading
          wattAvg = wattTotal / wattCount;
          DEBUG_PRINT(F("Watt Average: "));
          DEBUG_PRINTLN(wattAvg);
    
          //Only update if last usage was different by 2 watts
          if (wattAvgPrev - wattAvg > 2 || wattAvg - wattAvgPrev > 2)
          {
            //Send to gateway
            send(msgFanPwr.set(wattAvg));
    
    #ifdef TFT_DISPLAY_ON
            if (fanPowerReading == 1)
            {
              //Update LCD if running
              tft.setTextColor(ST7735_WHITE, tft.Color565(53, 47, 125));
              tft.setFont();
              tft.setTextSize(1);
              tft.setCursor(5, 95);
              tft.print("Watts: "); //First line of text 20 characters max
              tft.print(wattAvg);
              tft.print("  ");
              DEBUG_PRINT(F("Watts update display: "));
              DEBUG_PRINTLN(wattAvg);
            }
    
    
    #endif
    
          }
          wattAvgPrev = wattAvg;
    
          //Reset watt trackers
          wattTotal = 0;
          wattCount = 0;
    
          powerUpdateMillis = currentMillis;
    
          //Using this if statement to update the time every minute
    #ifdef TFT_DISPLAY_ON
          //Update Time on Display every minute
          updateTime();
    #endif
        }
      }
    
      if (currentMillis - lastGetTime >= 3600000UL) // updates clock time and gets zone times from gateway once every hour
      {
        DEBUG_PRINTLN(F("Requesting time and valve data from Gateway..."));
    
        lastGetTime = millis();
      }
    }
    
    void fanOff() {
      /*
         1. Turn off the fan
         2. Make sure it's off before we start closing the cover
         3. Close cover
            a. Start a timer for how long the closing should take
            b. Stop the motor when the limit switch is hit
         4. Ensure the limit switch has been pressed and the timer didn't run out.  If it did send an error message (via motion sensor).
         5. Send "off" message to gateway/controller
      */
    
      //DEBUG_PRINTLN(F("In the fanOff function"));
      if (fanRelayState == RELAY_ON)
      {
        DEBUG_PRINTLN(F("Turning off fan"));
        //Turn off fan and set fan relay state to 0
        digitalWrite(FAN_RELAY_PIN, RELAY_OFF);
        fanRelayState = RELAY_OFF;
    
      }
      if (currentMillis - coverMillis < coverLimitTime)
      {
        if (coverPowerReading == 0)
        {
          //Make sure the fan is off before closing the cover to prevent damage to the cover and fan
          if (fanPowerReading == 0)
          {
            //Start closing the cover
            //Set the close pin on the L298N board to high
    
            if (coverMoving == 0)
            {
              DEBUG_PRINTLN(F("Closing Cover"));
              digitalWrite(COVER_CLOSE_PIN, HIGH);
              //Set COVER_OPEN_PIN to low just to be safe
              digitalWrite(COVER_OPEN_PIN, LOW);
    
              //Update the LCD with "Closing" status message
    #ifdef TFT_DISPLAY_ON
              tft.setTextColor(ST7735_WHITE, tft.Color565(53, 47, 125));
              tft.setFont();
              tft.setTextSize(1);
              tft.setCursor(5, 95);
              tft.print("CLOSING COVER     "); //First line of text 20 characters max
    #endif
              coverMoving = 1;
            }
    
            if (coverClosedState == LOW)
            {
              //The cover is closed.  Stop motor and send status to gateway.
              digitalWrite(COVER_CLOSE_PIN, LOW);
              fanStatePrevious = fanState;
              send(msgFan.set(fanState), true); // Send new state with Ack
              coverMoving = 0;
    
    #ifdef TFT_DISPLAY_ON
              //Update LCD
              wait(200); //Wait for radio SPI to stop (otherwise display is garbled)
              updateTFTStatus(0); //Set status to idle state
    #endif
            }
          }
        }
        else
        {
          //Cover motor is using too much power.  Stop everything to avoid damage.
          DEBUG_PRINTLN(F("The slide motor is using too much power!"));
          digitalWrite(COVER_CLOSE_PIN, LOW);
          digitalWrite(COVER_OPEN_PIN, LOW);
          errorState = 1; //Set the error state so it doesn't keep trying to close
          send(msgError.set(1)); // Send alert state to gateway
    #ifdef TFT_DISPLAY_ON
          //Update LCD
          updateTFTStatus(2); //Set status to error state
          errorOvercurrent(); //More detailed error message
    #endif
        }
      }
      else
      {
        /*Things have taken too long there must be an error.  Print it out to the LCD and send trigger to gateway
          Possible errors could be:
          Fan did not shut off.
          Cover did not fully close in time (slide jam, motor slip etc.)
          Over current in cover motor (jammed?)
        */
        //Send commands to stop everything to avoid damage.
        DEBUG_PRINTLN(F("Cover time exceeded"));
        digitalWrite(FAN_RELAY_PIN, RELAY_OFF);
        digitalWrite(COVER_CLOSE_PIN, LOW);
        digitalWrite(COVER_OPEN_PIN, LOW);
        errorState = 1; //Set the error state so it doesn't keep trying to close
        send(msgError.set(1)); // Send alert state to gateway
    
    #ifdef TFT_DISPLAY_ON
        //Update LCD
        updateTFTStatus(2); //Set status to error state
        errorTime(); //Write more detailed error to LCD
    #endif
      }
    }
    
    void fanOn() {
    
      /*
        1. Open the cover
          a. Start a timer to keep track of how long the cover has been opening 
          b. Stop the motor when the limit switch is hit
        2. Ensure the limit switch has been pressed and the timer didn't run out.  If it did send an error message.
        3. Start the fan
        4. Send "on" message to gateway/controller
      */
    
      if (currentMillis - coverMillis < coverLimitTime)
      {
        if (coverPowerReading == 0)
        {
          //Start opening the cover
          if (coverMoving == 0)
          {
            DEBUG_PRINTLN(F("Opening Cover"));
    
            //Set COVER_CLOSE_PIN to low just to be safe
            digitalWrite(COVER_CLOSE_PIN, LOW);
            digitalWrite(COVER_OPEN_PIN, HIGH);
            coverMoving = 1;
    
    #ifdef TFT_DISPLAY_ON
            wait(200); //Wait for radio communication to stop (otherwise display is garbled because of SPI conflicts)
            //Update LCD
            updateTFTStatus(1); //Set status to idle state
    #endif
    
          }
    
          if (coverOpenState == LOW)
          {
            //The cover is open.  Stop motor and send status to gateway.
            digitalWrite(COVER_OPEN_PIN, LOW);
            fanStatePrevious = fanState;
            //Turn on Fan
            digitalWrite(FAN_RELAY_PIN, RELAY_ON);
            fanRelayState = RELAY_ON;
            coverMoving = 0;
          }
        }
        else
        {
          //Cover motor is using too much power.  Stop everything to avoid damage.
          DEBUG_PRINTLN(F("The cover motor is using too much power!"));
          digitalWrite(COVER_CLOSE_PIN, LOW);
          digitalWrite(COVER_OPEN_PIN, LOW);
          errorState = 1; //Set the error state so it doesn't keep trying to close
          send(msgError.set(1)); // Send alert state to gateway
    #ifdef TFT_DISPLAY_ON
          //Update LCD
          updateTFTStatus(2); //Set status to error state
          errorOvercurrent(); //More detailed error message
    #endif
        }
      }
      else
      {
        /*Things have taken too long there must be an error.  Print it out to the LCD and send trigger to gateway
          Possible errors could be:
          Cover did not fully open in time (slide jam, motor slip etc.)
          Overcurrent in cover motor (jammed?)
        */
        //Send commands to stop everything to avoid damage.
        DEBUG_PRINTLN(F("Cover time exceeded"));
        digitalWrite(COVER_CLOSE_PIN, LOW);
        digitalWrite(COVER_OPEN_PIN, LOW);
        errorState = 1; //Set the error state so it doesn't keep trying to close
    
    #ifdef TFT_DISPLAY_ON
        //Update LCD
        updateTFTStatus(2); //Set status to error state
        tft.setCursor(5, 90);
        //More detailed error message
        errorTime();
    #endif
      }
    
    }
    
    
    void receive(const MyMessage & message) {
      // We only expect one type of message from controller. But we better check anyway.
      if (message.isAck()) {
        DEBUG_PRINTLN(F("This is an ack from gateway"));
      }
    
      if (message.type == V_LIGHT && !message.isAck()) {
        // Change relay state
        fanState = message.getBool();
        if (coverMoving == 1)
        {
          //If the cover is already moving, check to see if we need to change directions
          DEBUG_PRINT(F("Cover is moving"));
          if (fanState == fanStatePrevious)
          {
            //We need to change directions
            fanStatePrevious = fanState ? 0 : 1;
            coverMoving = 0;
          }
        }
        coverMillis = millis(); //Set the millis (used to keep track of cover close/open times)
    
        // Write some debug info
        DEBUG_PRINT(F("Incoming change for sensor:"));
        DEBUG_PRINT(message.sensor);
        DEBUG_PRINT(F(", New status: "));
        DEBUG_PRINTLN(fanState);
      }
    }
    
    // This is called when a new time value was received
    void receiveTime(unsigned long time) {
      // Ok, set incoming time 
      setTime(time);
    }
    
    #ifdef TFT_DISPLAY_ON
    void updateTFTStatus(uint8_t bgStat)
    {
      //bgStat: 0 = "Idle", 1 = "Running", 2 = "Error"
      //Idle Color = 37, 125, 20
      //Running Color = 53, 47, 125
      //Error Color = 155, 26, 26
    
      uint8_t r, g, b;
      const char *displayStatus[] = {
        "Idle", "Running", "Error"
      };
      if (bgStat == 0)
      {
        //Idle
        r = 37;
        g = 125;
        b = 20;
      }
      else if (bgStat == 1)
      {
        //Running
        r = 53;
        g = 47;
        b = 125;
      }
      else
      {
        //Error
        r = 155;
        g = 26;
        b = 26;
      }
    
      tft.fillRect(0, 0, 160, 7, tft.Color565(r, g, b));
      tft.fillRect(0, 30, 160, 80, tft.Color565(r, g, b));
      tft.fillRect(0, 154, 160, 6, tft.Color565(r, g, b));
    
      tft.setCursor(5, 40);
      tft.setTextColor(ST7735_WHITE);
      tft.setTextSize(1);
      tft.println("Status");
    
      tft.setCursor(5, 65);
      tft.setTextColor(ST7735_WHITE);
      tft.setFont();
      //tft.setTextSize(3);
      tft.setTextSize(bgStat == 1 ? 2 : 3); //The word "Running" doesn't fit with text size 3.
      tft.println(displayStatus[bgStat]);
    
    }
    void errorOvercurrent()
    {
      tft.setCursor(5, 90);
      tft.setTextColor(ST7735_WHITE);
      tft.setFont();
      tft.setTextSize(1);
      tft.println("Motor overcurrent"); //First line of text 20 characters max
      tft.setCursor(5, 101);
      tft.println("Check cover slide"); //Second line of text 20 characters max
    }
    void errorTime()
    {
      tft.setCursor(5, 90);
      tft.setTextColor(ST7735_WHITE);
      tft.setFont();
      tft.setTextSize(1);
      tft.println("Time exceeded"); //First line of text 20 characters max
      tft.setCursor(5, 100);
      tft.println("Check cover slide"); //Second line of text 20 characters max
    }
    void updateTime()
    {
      //Update Time
      tft.setCursor(5, 17);
      tft.setTextColor(ST7735_WHITE, tft.Color565(80, 80, 80));
      tft.setTextSize(1);
      tft.print(hourFormat12());
      tft.print(minute() < 10 ? F(":0") : F(":"));
      tft.print(minute());
      tft.print(isAM() ? F("am") : F("pm"));
      tft.print(month() < 10 ? F(" 0") : F(" "));
      tft.print(month());
      tft.print(day() < 10 ? F("/0") : F("/"));
      tft.print(day());
      tft.print(F("/"));
      tft.print(year() % 100);
      tft.print(F(" "));
    }
    void updateTemp()
    {
      //Update Temperature
      tft.setCursor(5, 120);
      tft.setTextColor(tft.Color565(80, 80, 80), tft.Color565(230, 230, 230));
      tft.setTextSize(1);
      tft.print("Temp: ");
      tft.print(lastTemp, 1);
      tft.print((char)247);
      tft.print(" ");
    }
    void updateHum()
    {
      //Update Humidity
      tft.setCursor(5, 140);
      tft.setTextColor(tft.Color565(80, 80, 80), tft.Color565(230, 230, 230));
      tft.setTextSize(1);
      tft.print("Humidity: ");
      tft.print(lastHum, 1);
      tft.print("% ");
    }
    #endif
    


  • This is the output that i get. Maybe you can understand why. And this is a clean example. Anyone have make temp DHT11 to work in version2 ?

    Starting sensor (RNNNA-, 2.0.0)
    TSM:INIT
    TSM:RADIO:OK
    TSP:ASSIGNID:OK (ID=27)
    TSM:FPAR
    TSP:MSG:SEND 27-27-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
    TSM:FPAR
    TSP:MSG:SEND 27-27-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
    TSP:MSG:READ 25-25-27 s=255,c=3,t=8,pt=1,l=1,sg=0:1
    TSP:MSG:FPAR RES (ID=25, dist=1)
    TSP:MSG:PAR OK (ID=25, dist=2)
    TSP:MSG:READ 0-0-27 s=255,c=3,t=8,pt=1,l=1,sg=0:0
    TSP:MSG:FPAR RES (ID=0, dist=0)
    TSP:MSG:PAR OK (ID=0, dist=1)
    TSM:FPAR:OK
    TSM:ID
    TSM:CHKID:OK (ID=27)
    TSM:UPL
    TSP:PING:SEND (dest=0)
    TSP:MSG:SEND 27-27-0-0 s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=ok:1
    TSP:MSG:READ 0-0-27 s=255,c=3,t=25,pt=1,l=1,sg=0:1
    TSP:MSG:PONG RECV (hops=1)
    TSP:CHKUPL:OK
    TSM:UPL:OK
    TSM:READY
    TSP:MSG:SEND 27-27-0-0 s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=ok:0100
    TSP:MSG:SEND 27-27-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=ok:2.0.0
    TSP:MSG:SEND 27-27-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=ok:0
    TSP:MSG:READ 0-0-27 s=255,c=3,t=15,pt=6,l=2,sg=0:0100
    TSP:MSG:READ 0-0-27 s=255,c=3,t=6,pt=0,l=1,sg=0:M
    TSP:MSG:SEND 27-27-0-0 s=255,c=3,t=11,pt=0,l=22,sg=0,ft=0,st=ok:TemperatureAndHumidity
    TSP:MSG:SEND 27-27-0-0 s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=ok:1.1
    TSP:MSG:SEND 27-27-0-0 s=0,c=0,t=7,pt=0,l=0,sg=0,ft=0,st=ok:
    TSP:MSG:SEND 27-27-0-0 s=1,c=0,t=6,pt=0,l=0,sg=0,ft=0,st=ok:
    Request registration...
    TSP:MSG:SEND 27-27-0-0 s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=ok:2
    TSP:MSG:READ 0-0-27 s=255,c=3,t=27,pt=1,l=1,sg=0:1
    Node registration=1
    Init complete, id=27, parent=0, distance=1, registration=1```
    

    If i get the sensor out i get this

    Init complete, id=27, parent=0, distance=1, registration=1
    Failed reading temperature from DHT!
    Failed reading humidity from DHT
    

  • Admin

    @rechin304 Something is most likely wrong with your wiring or the sensor. I am using a DHT22 without any issues in my rain gauge which is on 2.0 (I'm using the most recent beta release). Try connecting a 4.7k resistor between the data pin and power on the DHT like this.
    0_1478303148400_upload-1d245d6b-aad9-4841-8307-485c9caf5056



  • @petewill wow, your screen case looks amazing! Is that acryl glass? Did you build that yourself too?


  • Admin

    @enlo Thanks. Yeah, it's acrylic glass (Plexiglas). It was a pain to use though as I couldn't clean off the paint very well. My next project I'm working on I'm going to try to use regular glass.



  • @rechin304 said:

    dht.setup(DHT_DATA_PIN);
    if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
    Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
    }
    // Sleep for the time of the minimum sampling period to give the sensor time to power up
    // (otherwise, timeout errors might occure for the first reading)
    sleep(dht.getMinimumSamplingPeriod());

    For what it's worth, I just went through a very long debug session trying to get a simple dht11 based sensor built and working. For reasons I don't even pretend to understand, the one thing I changed that allows it to work is changing the 'sleep' command in this section of the setup function to a 'wait' command.


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