int ldrPin = A5;
int led = 7;

void setup(){
  pinMode(ldrPin,INPUT);
  pinMode(led,OUTPUT);
  Serial.begin(5000);
}

void loop(){
  int readFromldr = analogRead(ldrPin);
  Serial.println(readFromldr);
  delay(2000);
  if (readFromldr < 100){
    digitalWrite(led,HIGH);
  }
  else{
    digitalWrite(led,LOW);
  }
}