const int LDRPIN=A0;
void setup() {
  // put your setup code here, to run once:
   Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
   float ldr_value=analogRead(LDRPIN);
   Serial.print("LDR value");
   Serial.println(ldr_value);
   delay(2000);
}