DHT and DOOR sensor

mfalkvidd

@homer you'll need to install the modified DHT library as described on https://www.mysensors.org/build/humidity#example

Homer

@homer you'll need to install the modified DHT library as described on https://www.mysensors.org/build/humidity#example

Thanks, but did I spot the issue with the pins correctly?

mfalkvidd

@homer yes, they are using the same pin. Move one of them (doesn't matter which) to pin 2. On atmega328, only pins 2 and 3 have full interrupt functionality.

Terence Faul

Hi

I have sorted the pins and library problems, but now I get failed to read errors

Updated Sketch

/**
 * 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.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0: Henrik EKblad
 * Version 1.1 - 2016-07-20: Converted to MySensors v2.0 and added various improvements - Torben Woltjen (mozzbozz)
 *
 * DESCRIPTION
 * This sketch provides an example of how to implement a humidity/temperature
 * sensor using a DHT11/DHT-22.
 *
 * For more information, please visit:
 * http://www.mysensors.org/build/humidity
 *
 */

// Enable debug prints
#define MY_DEBUG

#define MY_RX_MESSAGE_BUFFER_FEATURE
#define MY_RF24_IRQ_PIN 2

// Enable and select radio type attached
#define MY_RADIO_RF24
//#define MY_RADIO_RFM69
//#define MY_RS485

#include <SPI.h>
#include <MySensors.h>
#include <DHT.h>
#include <Bounce2.h>

// Set this to the pin you connected the DHT's data pin to
#define DHT_DATA_PIN 4

#define BUTTON_PIN  3  // Arduino Digital I/O pin for button/reed switch

// Set this offset if the sensor has a permanent small offset to the real temperatures.
// In Celsius degrees (as measured by the device)
#define SENSOR_TEMP_OFFSET 0

// Sleep time between sensor updates (in milliseconds)
// Must be >1000ms for DHT22 and >2000ms for DHT11
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 CHILD_ID 3
#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1


float lastTemp;
float lastHum;
uint8_t nNoUpdatesTemp;
uint8_t nNoUpdatesHum;
bool metric = true;

MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;

Bounce debouncer = Bounce();
int oldValue=-1;

// Change to V_LIGHT if you use S_LIGHT in presentation below
MyMessage msg(CHILD_ID,V_TRIPPED);


void presentation()
{
  // Send the sketch version information to the gateway
  sendSketchInfo("Door/DHT", "1.1");

  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID_HUM, S_HUM);
  present(CHILD_ID_TEMP, S_TEMP);

	// Register binary input sensor to gw (they will be created as child devices)
// You can use S_DOOR, S_MOTION or S_LIGHT here depending on your usage.
// If S_LIGHT is used, remember to update variable type you send in. See "msg" above.
  present(CHILD_ID, S_DOOR);

  metric = getControllerConfig().isMetric;
}


void setup()
{
  dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
  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());
	// Setup the button
pinMode(BUTTON_PIN,INPUT);
// Activate internal pull-up
digitalWrite(BUTTON_PIN,HIGH);

// After setting up the button, setup debouncer
debouncer.attach(BUTTON_PIN);
debouncer.interval(5);
}


void loop()
{
  // Force reading sensor, so it works also after sleep()
  dht.readSensor(true);

  // Get temperature from DHT library
  float temperature = dht.getTemperature();
  if (isnan(temperature)) {
    Serial.println("Failed reading temperature from DHT!");
  } else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {
    // Only send temperature if it changed since the last measurement or if we didn't send an update for n times
    lastTemp = temperature;

    // apply the offset before converting to something different than Celsius degrees
    temperature += SENSOR_TEMP_OFFSET;

    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    // Reset no updates counter
    nNoUpdatesTemp = 0;
    send(msgTemp.set(temperature, 1));

    #ifdef MY_DEBUG
    Serial.print("T: ");
    Serial.println(temperature);
    #endif
  } else {
    // Increase no update counter if the temperature stayed the same
    nNoUpdatesTemp++;
  }

  // Get humidity from DHT library
  float humidity = dht.getHumidity();
  if (isnan(humidity)) {
    Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS) {
    // Only send humidity if it changed since the last measurement or if we didn't send an update for n times
    lastHum = humidity;
    // Reset no updates counter
    nNoUpdatesHum = 0;
    send(msgHum.set(humidity, 1));

    #ifdef MY_DEBUG
    Serial.print("H: ");
    Serial.println(humidity);
    #endif
  } else {
    // Increase no update counter if the humidity stayed the same
    nNoUpdatesHum++;

		debouncer.update();
  // Get the update value
  int value = debouncer.read();

  if (value != oldValue) {
     // Send in the new value
     send(msg.set(value==HIGH ? 1 : 0));
     oldValue = value;
  }


  // Sleep for a while to save energy
  sleep(UPDATE_INTERVAL);
}}

and error snippet

3534 TSF:MSG:SEND,1-1-0-0,s=2,c=1,t=16,pt=0,l=1,sg=0,ft=0,st=OK:1
Failed reading temperature from DHT!
Failed reading humidity from DHT
3545 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3553 TSF:TDI:TSL
3555 MCO:SLP:WUP=1
3557 TSF:TRI:TSB
1
3584 TSF:MSG:SEND,1-1-0-0,s=2,c=1,t=16,pt=0,l=1,sg=0,ft=0,st=OK:1
Failed reading temperature from DHT!
Failed reading humidity from DHT
3592 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3602 TSF:TDI:TSL
3604 MCO:SLP:WUP=1
3606 TSF:TRI:TSB

mfalkvidd

@terence-faul said in DHT and DOOR sensor:

Failed reading temperature from DHT!
Failed reading humidity from DHT

This means the DHT library is unable to read from the DHT sensor. Double-check that the DHT gets sufficient power and that it is wired correctly. If you have another DHT sensor, switch sensors and see if that helps.

Terence Faul

Will give that a go. But if I load the DHT only sketch on the same node it reads fine.

Could you check my sketch I’m a bit of a noob with code

mfalkvidd

@terence-faul the sketch looks good to me. Could you post your "dht only" sketch?

Homer

I can't believe I spotted am error in the code! I guess I'm starting to get a bit better at this! 😁😁

Terence Faul

/**
 * 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.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0: Henrik EKblad
 * Version 1.1 - 2016-07-20: Converted to MySensors v2.0 and added various improvements - Torben Woltjen (mozzbozz)
 *
 * DESCRIPTION
 * This sketch provides an example of how to implement a humidity/temperature
 * sensor using a DHT11/DHT-22.
 *
 * For more information, please visit:
 * http://www.mysensors.org/build/humidity
 *
 */

// Enable debug prints
#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69
//#define MY_RS485

#include <SPI.h>
#include <MySensors.h>
#include <DHT.h>

// Set this to the pin you connected the DHT's data pin to
#define DHT_DATA_PIN 4

// Set this offset if the sensor has a permanent small offset to the real temperatures.
// In Celsius degrees (as measured by the device)
#define SENSOR_TEMP_OFFSET 0

// Sleep time between sensor updates (in milliseconds)
// Must be >1000ms for DHT22 and >2000ms for DHT11
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 CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1

float lastTemp;
float lastHum;
uint8_t nNoUpdatesTemp;
uint8_t nNoUpdatesHum;
bool metric = true;

MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;


void presentation()
{
  // Send the sketch version information to the gateway
  sendSketchInfo("TemperatureAndHumidity", "1.1");

  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID_HUM, S_HUM);
  present(CHILD_ID_TEMP, S_TEMP);

  metric = getControllerConfig().isMetric;
}


void setup()
{
  dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
  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());
}


void loop()
{
  // Force reading sensor, so it works also after sleep()
  dht.readSensor(true);

  // Get temperature from DHT library
  float temperature = dht.getTemperature();
  if (isnan(temperature)) {
    Serial.println("Failed reading temperature from DHT!");
  } else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {
    // Only send temperature if it changed since the last measurement or if we didn't send an update for n times
    lastTemp = temperature;

    // apply the offset before converting to something different than Celsius degrees
    temperature += SENSOR_TEMP_OFFSET;

    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    // Reset no updates counter
    nNoUpdatesTemp = 0;
    send(msgTemp.set(temperature, 1));

    #ifdef MY_DEBUG
    Serial.print("T: ");
    Serial.println(temperature);
    #endif
  } else {
    // Increase no update counter if the temperature stayed the same
    nNoUpdatesTemp++;
  }

  // Get humidity from DHT library
  float humidity = dht.getHumidity();
  if (isnan(humidity)) {
    Serial.println("Failed reading humidity from DHT");
  } else if (humidity != lastHum || nNoUpdatesHum == FORCE_UPDATE_N_READS) {
    // Only send humidity if it changed since the last measurement or if we didn't send an update for n times
    lastHum = humidity;
    // Reset no updates counter
    nNoUpdatesHum = 0;
    send(msgHum.set(humidity, 1));

    #ifdef MY_DEBUG
    Serial.print("H: ");
    Serial.println(humidity);
    #endif
  } else {
    // Increase no update counter if the humidity stayed the same
    nNoUpdatesHum++;
  }

  // Sleep for a while to save energy
  sleep(UPDATE_INTERVAL);
}

mfalkvidd

Thanks @terence-faul
I can't see any problem with the sketches.

skywatch

@Terence-Faul The only thing I can say is that it is generally good practice to put all #include statements at the start of the code, then all the #define statements and finally all other items. At the moment you #define things before you #include the library and maybe that is an issue for the compiler?

mfalkvidd

@skywatch while your recommendation is good in general, all MySensors defines (MY_*) must be defined before including MySensors.h. Otherwise the defines won't be available to the library, so the library will need to fall back on the default settings.

Terence Faul

Thanks so much for the help, what is the next step then? create two sensors?

kimot

@terence-faul
comment step by step blocks of code for DOOR switch and try when it start to work.

skywatch

@mfalkvidd Ah yes, I forgot that bit!

skywatch

This post is deleted!

sharpy

Hi @terence-faul did you fix this?

i'm also trying too merge a door & dht sketch but have not got a clue where too start

if you have solved this can you post the working sketch

Homer

How much power are you feeding the sensor? I've had issues when I've fed too little power and it's resolved once I use more power.

DHT and DOOR sensor

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