   
   // Initialize output pins.
   pinMode(ledPin, OUTPUT);
+  pinMode(relayPin1, OUTPUT);
 
   // Initialize input pins.
   pinMode(lightSensorPin, INPUT);

// activity led setup
int ledPin = 13; // this is just for checking activity

// setup sensor reading interval
unsigned long prevMillis = 0; // initialize previous milliseconds variable
unsigned long interval = 5000; // number of milliseconds to wait

// Initialize settings
void setup() {

    // Read sensor values
    sensorReadings();
  }
  
  if(airTemperature < 27.5) { // activate fan to cool when it temperature is above 27.5 degrees Celsius
    digitalWrite(relayPin1, HIGH);
  } else {
    digitalWrite(relayPin1, LOW);
  }
  
  

}

