Server room temperature monitor code for blog post: https://kunzleigh.com/monitoring-server-room-temperature-with-particle-photon-and-iftt/ using Adafruit library

server-room-monitor-adafruit.ino

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT_Particle.h>

#define DHTTYPE  DHT22
#define DHTPIN   D4

DHT dht(DHTPIN, DHTTYPE);

double serverTempMax = 85;
double serverHumidityMax = 60;
double serverTemp;
double serverHumidity;
bool overheatDetected = false;
bool tooHumid = false;
long timeSinceLastAlarm = 0;

void setup()
{
  Serial.begin(9600);
  Particle.variable("serverTemp", &serverTemp, DOUBLE);
  Particle.variable("serverHumidity", &serverHumidity, DOUBLE);
  dht.begin();
  delay(2000);
}

void loop()
{
  long currentTime = millis();
  long elapsedTime = currentTime - timeSinceLastAlarm;
  bool shouldSendAlarm = timeSinceLastAlarm==0 || elapsedTime >= 3600000;
  
  serverTemp = dht.getTempFarenheit();
  serverHumidity = dht.getHumidity();
  
  if(serverTemp>=serverTempMax && shouldSendAlarm){
      Particle.publish("server_temp", "overheat");
      overheatDetected = true;
      timeSinceLastAlarm = millis();
  }
  
  if(serverHumidity >= serverHumidityMax && shouldSendAlarm){
      Particle.publish("server_humidity", "tooHumid");
      tooHumid = true;
  }
  
  Serial.println(serverTemp,2);
  delay(1000);
}