#define LDR A0 
#define LED 2
int value;
void setup() {
Serial.begin(9600);
pinMode(LDR,INPUT);
pinMode(LED,OUTPUT);

}

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

if(value>1000)
{
digitalWrite(LED,HIGH);
}
else
{
  digitalWrite (LED,LOW);
}

}