#define led 5
#define ldr 27
void setup(){
Serial.begin(9600);
pinMode(led,OUTPUT);
}
void loop()
{
  int value=analogRead(ldr);
  Serial.println(value);
  if(value<200)
  {
    digitalWrite(led, HIGH);
  }
  else
  {
    digitalWrite(led,LOW);
  }
}