#define LIGHT_SENSOR_PIN  13  
#define LED_PIN            22
#define ANALOG_THRESHOLD 100

void setup() {
  // initialize serial communication
  Serial.begin(9600);
  pinMode(LED_PIN , OUTPUT);
}

void loop() {
  int lightState = analogRead(LIGHT_SENSOR_PIN); 

  if (lightState < ANALOG_THRESHOLD) {
    digitalWrite(LED_PIN , HIGH);
    Serial.println("LIGHT ON");
  }
    else {
    digitalWrite(LED_PIN , LOW);
    Serial.println("LIGHT OFF");
  }
}