int ldr = A0;
int ldrVal;
int led = 10;


void setup(){

  Serial.begin(9600);
  pinMode(ldr, INPUT);
  pinMode(led, OUTPUT);

}

void loop(){
  ldrVal = analogRead(ldr);
  if(ldrVal <= 240){
    Serial.println(ldrVal);
    digitalWrite(led, HIGH);
  }
  else{
    Serial.println(ldrVal);
    digitalWrite(led, LOW);
  }
}