Page 3

int ldrPin = A0;
int ledPin = 13;
int threshold = 55;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(ldrPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int ldrValue = analogRead(ldrPin);
  Serial.println(ldrValue);

  if (ldrValue < threshold) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }

  delay(100);
}