const int ledPin = 13;

const int ldrPin = A0;

void setup() {

Serial.begin(9600);

pinMode(ledPin, OUTPUT);

pinMode(ldrPin, INPUT);

}

void loop() {

int ldr = analogRead(ldrPin);

if (ldr >= 200) {

digitalWrite(ledPin, HIGH);

Serial.print("Its Night Time, Turn on the LED : ");

Serial.println(ldr);

} else {

digitalWrite(ledPin, LOW);

Serial.print("Its daytime, Turn off the LED : ");

Serial.println(ldr);

}

}