A beginners question
-
I have put a DHT22 sensor to my serial gateway, and in the sketch code for the DHT22 sensor there is sleeping “code”, static const uint64_t UPDATE_INTERVAL = 60000; and on the end sleep(UPDATE_INTERVAL); . Will this affect the gateway forcing it to sleep or will this only affect the DHT sensor? My sketch:
// Enable debug prints to serial monitor #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 // Set LOW transmit power level as default, if you have an amplified NRF-module and // power your radio separately with a good regulator you can turn up PA level. #define MY_RF24_PA_LEVEL RF24_PA_LOW // Enable serial gateway #define MY_GATEWAY_SERIAL // Define a lower baud rate for Arduino's running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender) #if F_CPU == 8000000L #define MY_BAUD_RATE 38400 #endif // Flash leds on rx/tx/err #define MY_LEDS_BLINKING_FEATURE // Set blinking period #define MY_DEFAULT_LED_BLINK_PERIOD 300 // Inverses the behavior of leds //#define MY_WITH_LEDS_BLINKING_INVERSE // Enable inclusion mode #define MY_INCLUSION_MODE_FEATURE // Enable Inclusion mode button on gateway #define MY_INCLUSION_BUTTON_FEATURE // Inverses behavior of inclusion button (if using external pullup) //#define MY_INCLUSION_BUTTON_EXTERNAL_PULLUP // Set inclusion mode duration (in seconds) #define MY_INCLUSION_MODE_DURATION 60 // Digital pin used for inclusion mode button #define MY_INCLUSION_MODE_BUTTON_PIN 3 // Uncomment to override default HW configurations //#define MY_DEFAULT_ERR_LED_PIN 4 // Error led pin //#define MY_DEFAULT_RX_LED_PIN 6 // Receive led pin //#define MY_DEFAULT_TX_LED_PIN 5 // the PCB, on board LED #include <DHT.h> #include <SPI.h> #include <MySensors.h> //DHT Begin // Set this to the pin you connected the DHT's data pin to #define DHT_DATA_PIN 8 // Set this offset if the sensor has a permanent small offset to the real temperatures #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 10 #define CHILD_ID_TEMP 11 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 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 presentation() { // Send the sketch version information to the gateway sendSketchInfo("Getway+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); metric = getConfig().isMetric; } 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; if (!metric) { temperature = dht.toFahrenheit(temperature); } // Reset no updates counter nNoUpdatesTemp = 0; temperature += SENSOR_TEMP_OFFSET; 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); }
-
@Hilltan If you use sleep, an Arduino will go to sleep and is not able to receive any message. By using this
sleep(UPDATE_INTERVAL);Your gateway will go to sleep and will not receive messages from other nodes. Which is kind of the main task of a gateway.
It should be
wait( UPDATE_INTERVAL );Basic rule is. Use sleep only on battery powered nodes that don't have any incoming message. Use wait in all other circumstances.
ps. I put your sketch between 4 `
-
Thanks for a replay. I change sleep to wait then. What I was concerned about was to “read” to often from the DHT sensor. But I believe "static const uint64_t UPDATE_INTERVAL = 60000; " in the beginning will regulate this, so my gateway will not over read the DHT sensor?
-
@Hilltan the wait call will not return until the specified number of milliseconds has passed. So yes it will prevent from reading the dht too often.
-
About to built a dht / pir / repeater.
Since i cant Sleep it do i need to change all sleep with wait?In the dht example there is a Sleep to let the sensor settle before Reading. Should this be a wait instead then?
-
@meanmrgreen yes
-
Hmm i have a combined sketch of the pir and dht example that works fine on a node that Can Sleep for a bit and interrupt with change on the pir.
But if i take that sketch and change the Sleep with interrupt to a wait(sleep_time) the pir is not registrering movement between wait Times'.
FIf i remove the wait alltoghter the pir is reporting the status every ms instead with the result that the dht can't read the temp!
-
@meanmrgreen could you post your sketch?
-
this is it.
https://create.arduino.cc/editor/meanmrgreen/e7e0219e-139a-4e89-88da-e02f0864e9c6/preview
not sure of link worksge. on phone atm. will paste it from comp later if its not working.
-
/** * 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 * * DESCRIPTION * Motion Sensor example using HC-SR501 * http://www.mysensors.org/build/motion * */ //Enable Repeater #define MY_REPEATER_FEATURE // Enable debug prints #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 #include <SPI.h> #include <MySensors.h> #include <DHT.h> unsigned long SLEEP_TIME = 120000; // Sleep time between reports (in milliseconds) #define DIGITAL_INPUT_SENSOR 2 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define DHT_DATA_PIN 4 #define CHILD_ID_MOT 1 // Id of the sensor child #define CHILD_ID_HUM 0 #define CHILD_ID_TEMP 2 // Set this offset if the sensor has a permanent small offset to the real temperatures #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 = 120000; // 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; float lastTemp; float lastHum; uint8_t nNoUpdatesTemp; uint8_t nNoUpdatesHum; bool metric = true; // Initialize motion message MyMessage msg(CHILD_ID_MOT, V_TRIPPED); 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 and Controller sendSketchInfo("PIR_DHT_REPEATER", "1.0"); // Register all sensors to gw (they will be created as child devices) present(CHILD_ID_MOT, S_MOTION); present(CHILD_ID_HUM, S_HUM); present(CHILD_ID_TEMP, S_TEMP); metric = getConfig().isMetric; } void setup() { pinMode(DIGITAL_INPUT_SENSOR, INPUT); // sets the motion sensor digital pin as input 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) wait(dht.getMinimumSamplingPeriod()); } void loop() { // Read digital motion value boolean tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; Serial.println(tripped); send(msg.set(tripped?"1":"0")); // Send tripped value to gw // Force reading sensor, so it works also after wait() 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; if (!metric) { temperature = dht.toFahrenheit(temperature); } // Reset no updates counter nNoUpdatesTemp = 0; temperature += SENSOR_TEMP_OFFSET; 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++; } // wait until interrupt comes in on motion sensor. Send update every two minute. wait(SLEEP_TIME); }
-
@meanmrgreen You should use non-blocking code with millis() and if{}. Look e.g. at
https://forum.mysensors.org/topic/461/motion-sensor
https://forum.mysensors.org/topic/2717/repeater-node-with-sensor/12
