const byte led = 13;
int ldr;

void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
Serial.begin(9600);

}



void loop() {
  // put your main code here, to run repeatedly:
ldr = analogRead(A0);

if (ldr > 800)
digitalWrite(led, HIGH);
else
digitalWrite(led, LOW);

Serial.println(ldr);


}