A simple temperature sensor that publishes an event to the Particle cloud if it gets above 82 degrees Fahrenheit

particle_temp_sensor.ino

void setup() { 
  Serial.begin(9600); 
} 

void loop() { 
  int val = analogRead(A0); 
  float voltage = val * 3.3 / 4096; // Convert analog reading to voltage value
  float tempC = (voltage - 0.5) * 100;
  float tempF = (tempC * 9.0 / 5.0) + 32.0;
  Serial.printlnf("Temp F: %3.1f  Temp C: %3.1f", tempF, tempC); 
  if(tempF > 82.0)
  {
    String msg = "Device " + Particle.deviceID() + " is reading " + String(tempF) + " degrees";
    Particle.publish("server_room_too_hot", msg, 60, PRIVATE);
  }
  delay(3000); 
}