#define LDR 5
#define LED 2
int value;
void setup() {
Serial.begin(9600);
pinMode(LDR, INPUT); 
pinMode(LED, OUTPUT); 
}

void loop() {
  value=digitalRead(LDR);
// Serial.print("LDR:");
//Serial.println(value);
if(value==0)
{
  digitalWrite(LED, LOW);
}
else
{
  digitalWrite(LED, HIGH);
}
}