2 or more DHT22 - Sensors on one Arduino pro mini

turborick

I am a newbie with MySensors And Arduino, I'm looking for a sketch to put 2 or more DHT22 sensors on a pro mini that will run in 2.0. I have the pro mini running with one sensor and the DhtTemperatureAndHumiditySensor sketch. I have no idea where to begin. below is the Sketch

Thank you in advance Rick

/**
 * 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 3

// 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 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 = getConfig().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;
    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); 
}

turborick

I found this forum thread but it must be for a version prior to 2.0
link text

can this sketch be converted to 2.0?

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

#define NUM_SENSORS 2

unsigned long SLEEP_TIME = 3000UL; // Sleep time between reads (in milliseconds)

MySensor gw;
MyMessage tempMssg(0, V_TEMP);
MyMessage humMssg(NUM_SENSORS, V_HUM);

byte tempID[NUM_SENSORS] = {0,1};
byte humID[NUM_SENSORS] = {2,3};


DHT* dht[NUM_SENSORS];
byte sensorPin[NUM_SENSORS] = {3, 4};
float lastTemp[NUM_SENSORS] = {0.0, 0.0};
float lastHum[NUM_SENSORS] = {0.0, 0.0};

boolean metric = true;

void setup()
{
  Serial.begin(9600);
  gw.begin();
  for (int i = 0; i < NUM_SENSORS; i++)
  {
    dht[i] = new DHT;
    dht[i]->setup(sensorPin[i]);
  }

  gw.sendSketchInfo("Humidity", "1.0");
  
  for (int i = 0; i < NUM_SENSORS; i++)
  {
    gw.present(tempID[i], S_TEMP);
    gw.present(humID[i], S_HUM);
  }
  
  metric = gw.getConfig().isMetric;
  Serial.println(F("Setup Complete."));
}

void loop()
{
  for (int i = 0; i < NUM_SENSORS; i++)
  {
    delay(dht[i]->getMinimumSamplingPeriod());
    float temperature = dht[i]->getTemperature();
    if (isnan(temperature))
    {
      Serial.print(F("Failed reading temperature from DHT"));
      Serial.println(i);
    }
    else if (temperature != lastTemp[i])
    {
      lastTemp[i] = temperature;
      if (!metric)
      {
        temperature = dht[i]->toFahrenheit(temperature);
      }
      gw.send(tempMssg.setSensor(i).set(temperature, false));  // no ack
      Serial.print(F("T"));
      Serial.print(i);
      Serial.print(F("= "));
      Serial.println(temperature);
    }
    float humidity = dht[i]->getHumidity();
    if (isnan(humidity)) 
    {
      Serial.print("Failed reading humidity from DHT");
      Serial.println(i);
    } 
    else if (humidity != lastHum[i]) 
    {
      lastHum[i] = humidity;
      gw.send(humMssg.setSensor(i).set(humidity, false));  // no ack
      Serial.print(F("H"));
      Serial.print(i);
      Serial.print(F("= "));
      Serial.println(humidity);
    }
  }
  gw.sleep(SLEEP_TIME); //sleep a bit
}```

korttoma

Here are the instructions how to convert the sketch. Please try and if you run in to trouble please let me know and I will walk you through it.

Converting sketch from 1.5 to to 2.0

Add the following to activate NRF-radio support

#define MY_RADIO_NRF24

Remove MySensor constructor

MySensors gw;

Remove MySensors setup() call

gw.setup(....);

If node expects incoming messages, add the following function to handle data:
void receive(const MyMessage &msg) {}

Move present() and sendSketchInfo() from setup() to a new function called presentation().

void presentation() {
     sendSketchInfo(...)	
     present(...);
}

If you’re using static ids , add:

#define MY_NODE_ID xx

If static parent node is used, add:

#define MY_PARENT_NODE_ID xx

If you want node to be a repeater, add

#define MY_REPEATER_FEATURE

If you need to reconfigure your CE/CS Pins (not needed if NRF is connected to default pins)

#define MY_RF24_CE_PIN 9
#define MY_RF24_CS_PIN 10

Remove all “gw.” before MySensors library calls.

If node requests time using requestTime(), remove callback argument define define the following function to handle time response:

void receiveTime(unsigned long ts) {
}

Make sure to include MySensors.h after any configuration defines.

turborick

@korttoma Thanks for the instructions. Can you check and see if I have missed anything in the code ?


#define MY_DEBUG
#define MY_REPEATER_FEATURE
#define MY_RADIO_NRF24

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

#define CHILD_ID_HUM1 1
#define CHILD_ID_TEMP1 2
#define HUMIDITY_SENSOR_1_DIGITAL_PIN 3

#define CHILD_ID_HUM2 3
#define CHILD_ID_TEMP2 4
#define HUMIDITY_SENSOR_2_DIGITAL_PIN 4

#define CHILD_ID_HUM3 5
#define CHILD_ID_TEMP3 6
#define HUMIDITY_SENSOR_3_DIGITAL_PIN 5
unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)


DHT dht1;
DHT dht2;
DHT dht3;


float lastTemp1;
float lastHum1;
float lastTemp2;
float lastHum2;
float lastTemp3;
float lastHum3;
boolean metric = true;

MyMessage msgHum1(CHILD_ID_HUM1, V_HUM);
MyMessage msgTemp1(CHILD_ID_TEMP1, V_TEMP);
MyMessage msgHum2(CHILD_ID_HUM2, V_HUM);
MyMessage msgTemp2(CHILD_ID_TEMP2, V_TEMP);
MyMessage msgHum3(CHILD_ID_HUM3, V_HUM);
MyMessage msgTemp3(CHILD_ID_TEMP3, V_TEMP);

void presentation()  
{ 
   // Send the Sketch Version Information to the Gateway
  sendSketchInfo("MultiDHT2", "1.0");
  
  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID_HUM1, S_HUM);
  wait( 55 );
  present(CHILD_ID_TEMP1, S_TEMP);
  wait( 55 );
  present(CHILD_ID_HUM2, S_HUM);
  wait( 55 );
  present(CHILD_ID_TEMP2, S_TEMP);
  wait( 55 );
  present(CHILD_ID_HUM3, S_HUM);
  wait( 55 );
  present(CHILD_ID_TEMP3, S_TEMP);
  wait( 55 );

  metric = getConfig().isMetric;
}

void setup()
{

  dht1.setup(HUMIDITY_SENSOR_1_DIGITAL_PIN);
  dht2.setup(HUMIDITY_SENSOR_2_DIGITAL_PIN);
  dht3.setup(HUMIDITY_SENSOR_3_DIGITAL_PIN);


}

void loop()
{
  delay(dht1.getMinimumSamplingPeriod());

  float temperature1 = dht1.getTemperature();
  if (isnan(temperature1)) {
    Serial.println("Failed reading temperature from DHT1");
  } else if (temperature1 != lastTemp1) {
    lastTemp1 = temperature1;
    if (!metric) {
      temperature1 = dht1.toFahrenheit(temperature1);
    }
    send(msgTemp1.set(temperature1, 1));
    Serial.print("T: ");
    Serial.println(temperature1);
  }

  float humidity1 = dht1.getHumidity();
  if (isnan(humidity1)) {
    Serial.println("Failed reading humidity from DHT1");
  } else if (humidity1 != lastHum1) {
    lastHum1 = humidity1;
    send(msgHum1.set(humidity1, 1));
    Serial.print("H: ");
    Serial.println(humidity1);
  }

  float temperature2 = dht2.getTemperature();
  if (isnan(temperature2)) {
    Serial.println("Failed reading temperature from DHT2");
  } else if (temperature2 != lastTemp2) {
    lastTemp2 = temperature2;
    if (!metric) {
      temperature2 = dht2.toFahrenheit(temperature2);
    }
    send(msgTemp2.set(temperature2, 1));
    Serial.print("T: ");
    Serial.println(temperature2);
  }

  float humidity2 = dht2.getHumidity();
  if (isnan(humidity2)) {
    Serial.println("Failed reading humidity from DHT2");
  } else if (humidity2 != lastHum2) {
    lastHum2 = humidity2;
    send(msgHum2.set(humidity2, 1));
    Serial.print("H: ");
    Serial.println(humidity2);
  }

  float temperature3 = dht3.getTemperature();
  if (isnan(temperature3)) {
    Serial.println("Failed reading temperature from DHT3");
  } else if (temperature3 != lastTemp3) {
    lastTemp3 = temperature3;
    if (!metric) {
      temperature3 = dht3.toFahrenheit(temperature3);
    }
    send(msgTemp3.set(temperature3, 1));
    Serial.print("T: ");
    Serial.println(temperature3);
  }

  float humidity3 = dht3.getHumidity();
  if (isnan(humidity3)) {
    Serial.println("Failed reading humidity from DHT3");
  } else if (humidity3 != lastHum3) {
    lastHum3 = humidity3;
    send(msgHum3.set(humidity3, 1));
    Serial.print("H: ");
    Serial.println(humidity3);
  }

  // sleep(SLEEP_TIME); //sleep a bit  //
  wait(SLEEP_TIME); //sleep a bit  //
}

korttoma

@turborick looks fine to me, does it compile?

turborick

@korttoma yes it compiles. here is the output from serial monitor

Starting repeater (RNNRA-, 2.0.0)
TSM:INIT
TSM:RADIO:OK
TSP:ASSIGNID:OK (ID=2)
TSM:FPAR
TSP:MSG:SEND 2-2-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=bc:
TSP:MSG:READ 0-0-2 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=2)
TSM:UPL
TSP:PING:SEND (dest=0)
TSP:MSG:SEND 2-2-0-0 s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=ok:1
TSP:MSG:READ 0-0-2 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 2-2-0-0 s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=ok:0100
TSP:MSG:SEND 2-2-0-0 s=255,c=0,t=18,pt=0,l=5,sg=0,ft=0,st=ok:2.0.0
TSP:MSG:SEND 2-2-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=ok:0
TSP:MSG:SEND 2-2-0-0 s=255,c=3,t=11,pt=0,l=9,sg=0,ft=0,st=ok:MultiDHT2
TSP:MSG:SEND 2-2-0-0 s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=ok:1.0
TSP:MSG:SEND 2-2-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,ft=0,st=ok:
TSP:MSG:SEND 2-2-0-0 s=2,c=0,t=6,pt=0,l=0,sg=0,ft=0,st=ok:
TSP:MSG:SEND 2-2-0-0 s=3,c=0,t=7,pt=0,l=0,sg=0,ft=0,st=ok:
TSP:MSG:SEND 2-2-0-0 s=4,c=0,t=6,pt=0,l=0,sg=0,ft=0,st=ok:
TSP:MSG:SEND 2-2-0-0 s=5,c=0,t=7,pt=0,l=0,sg=0,ft=0,st=ok:
TSP:MSG:SEND 2-2-0-0 s=6,c=0,t=6,pt=0,l=0,sg=0,ft=0,st=ok:
Request registration...
TSP:MSG:SEND 2-2-0-0 s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=ok:2
TSP:MSG:READ 0-0-2 s=255,c=3,t=27,pt=1,l=1,sg=0:1
Node registration=1
Init complete, id=2, parent=0, distance=1, registration=1
TSP:MSG:SEND 2-2-0-0 s=2,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=ok:18.8
T: 18.80
TSP:MSG:SEND 2-2-0-0 s=1,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:29.0
H: 29.00
TSP:MSG:SEND 2-2-0-0 s=4,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=ok:18.7
T: 18.70
TSP:MSG:SEND 2-2-0-0 s=3,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:27.5
H: 27.50
TSP:MSG:SEND 2-2-0-0 s=6,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=ok:18.8
T: 18.80
TSP:MSG:SEND 2-2-0-0 s=5,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:30.0
H: 30.00
TSP:MSG:SEND 2-2-0-0 s=4,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=ok:18.6
T: 18.60
TSP:MSG:SEND 2-2-0-0 s=5,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:30.1
H: 30.10
TSP:SANCHK:OK
TSP:MSG:SEND 2-2-0-0 s=1,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:28.9
H: 28.90
TSP:MSG:SEND 2-2-0-0 s=3,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:27.4
H: 27.40
TSP:MSG:SEND 2-2-0-0 s=4,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=ok:18.7
T: 18.70
TSP:MSG:SEND 2-2-0-0 s=3,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:27.5
H: 27.50
TSP:MSG:SEND 2-2-0-0 s=6,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=ok:18.7
T: 18.70
TSP:MSG:SEND 2-2-0-0 s=5,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=ok:30.2
H: 30.20
TSP:SANCHK:OK

korttoma

@turborick seems to be working just fine, don´t you think?

turborick

@korttoma I'll try and add to Vera tomorrow

2 or more DHT22 - Sensors on one Arduino pro mini

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