#define relay 2
#include <DHT22.h>
//define pin data
#define pinDATA SDA // SDA, or almost any other I/O pin
DHT22 dht22 (pinDATA); 

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200); //1bit=10µs
  Serial.println("\ntest capteur DTH12");
pinMode(relay, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  float temperatur = dht22.getTemperature();
  float humi = dht22.getHumidity();

  if (dht22.getLastError() != dht22.OK) {
    Serial.print("last error :");
    Serial.println(dht22.getLastError());
  }
if(temperatur > 25) {
digitalWrite(relay, HIGH);

  }
else{
digitalWrite(relay, LOW);

}
  Serial.print("humi=");Serial.print(humi,1);Serial.print("\t");
  Serial.print("temperatur=");Serial.println(temperatur,1);
  delay(2000); //Collecting period should be : >1.7 second
}