sensoresp/include/sensor_dht22.cpp

// Digital pin connected to the DHT sensor.  // dht pins: 1=power, 2=data, 3=NC, 4=GND. 10k from data to power needed 
#include "sensor_dht22.h"

#ifndef SENSOR_DHT22_temperature_minchange
  #define SENSOR_DHT22_temperature_minchange 0.2
#endif
#ifndef SENSOR_DHT22_temperature_senddelaymax
  #define SENSOR_DHT22_temperature_senddelaymax 300000
#endif
#ifndef SENSOR_DHT22_temperature_readdelay
  #define SENSOR_DHT22_temperature_readdelay 10000
#endif

#ifndef SENSOR_DHT22_humidity_minchange
  #define SENSOR_DHT22_humidity_minchange 2.0
#endif
#ifndef SENSOR_DHT22_humidity_senddelaymax
  #define SENSOR_DHT22_humidity_senddelaymax 300000
#endif
#ifndef SENSOR_DHT22_humidity_readdelay
  #define SENSOR_DHT22_humidity_readdelay 10000
#endif

Sensor_DHT22::Sensor_DHT22(int pin)
{
    dht = new DHT(pin,DHT22,11); //default:11
}

void Sensor_DHT22::init() //Things to be done during setup()
{
    Serial.println("initializing dht");
    dht->begin();
}

//Also called during setup()
void Sensor_DHT22::setSettings_Temperature(float minchange, unsigned long senddelaymax, unsigned long readdelay)
{
    dataDHT22_temperature.minchange=minchange;
    dataDHT22_temperature.senddelaymax=senddelaymax;
    dataDHT22_temperature.readdelay=readdelay;
}

//Also called during setup()
void Sensor_DHT22::setSettings_Humidity(float minchange, unsigned long senddelaymax, unsigned long readdelay)
{
    dataDHT22_humidity.minchange=minchange;
    dataDHT22_humidity.senddelaymax=senddelaymax;
    dataDHT22_humidity.readdelay=readdelay;
}

//Called during setup
void Sensor_DHT22::advertise(HomieNode& p_sensorNode)
{
    sensorNode = &p_sensorNode;
    #ifndef SENSOR_BMP180
      sensorNode->advertise("temperature");
    #else
      sensorNode->advertise("temperature_dht");
    #endif
    sensorNode->advertise("humidity");
}

void Sensor_DHT22::sensorloop()
{
  loop_DHT22_temperature();
  loop_DHT22_humidity();
}


void Sensor_DHT22::loop_DHT22_temperature()
{
  sensordata &d=dataDHT22_temperature;
  bool _changed=false;  

  if (millis() >= (d.lastreadtime+d.readdelay)) {
    d.value = dht->readTemperature();
    if (fabs(d.lastsentvalue-d.value)>=d.minchange){
      _changed=true;
    }
    d.lastreadtime=millis();
  }

  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
    Serial.print("Sending DHT22_temperature. reason=");
    if (_changed) Serial.println("change"); else Serial.println("time");

    if (!(isnan(d.value) == 1)){ //success
      
      #ifndef SENSOR_BMP180
        sensorNode->setProperty("temperature").send(String(d.value));
        Homie.getLogger() << "temperature " << ": " << d.value << endl;
      #else
        sensorNode->setProperty("temperature_dht").send(String(d.value));
        Homie.getLogger() << "temperature_dht " << ": " << d.value << endl;
      #endif
      
      d.lastsentvalue=d.value;
    }

    d.lastsent=millis();
  }
}

void Sensor_DHT22::loop_DHT22_humidity()
{
  sensordata &d=dataDHT22_humidity;
  bool _changed=false;
  

  if (millis() >= (d.lastreadtime+d.readdelay)) {
    d.value = dht->readHumidity();
    if (fabs(d.lastsentvalue-d.value)>=d.minchange){
      _changed=true;
    }
    d.lastreadtime=millis();
  }

  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
    Serial.print("Sending DHT22_humidity. reason=");
    if (_changed) Serial.println("change"); else Serial.println("time");

    if (!(isnan(d.value) == 1)){ //success
      Homie.getLogger() << "humidity " << ": " << d.value << endl;
      sensorNode->setProperty("humidity").send(String(d.value));
      d.lastsentvalue=d.value;
    }
    d.lastsent=millis();
  }
}