#define LDR 2
#define LED 3

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

void loop() {
  // put your main code here, to run repeatedly:
int value=digitalRead(LDR);
Serial.print("LDR:");
Serial.println(value);

if(value==1)
{
  digitalWrite(LED,HIGH);
}
else
{
  digitalWrite(LED, LOW);
}
}