#define ldrpin A0
#define ledrpin=2
int ldrval=0;
void setup()
{
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  Serial.begin(9600);
  pinMode(2, OUTPUT);
}

void loop() {
 ldrval= analogRead(ldrpin);
 if( ldrval>=100&& ldrval<=500)
    digitalWrite(2, HIGH);
    else 
    digitalWrite(2, LOW);
  if( ldrval>500&& ldrval<1023)
   digitalWrite(4, HIGH);
   else
    digitalWrite(4, LOW);
    Serial.println( ldrval);
    delay(1000);
}