void setup() 
{
  Serial.begin(9600);
  pinMode(A1, INPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop() 
{
 int nilaisensorldr = analogRead(A1);
 Serial.print("nilai sensor LDR =");
 Serial.println(nilaisensorldr);

//kondisi untuk on off lampu
  if (nilaisensorldr >=8 && nilaisensorldr <=300 )
  {
    digitalWrite(7,HIGH);
    digitalWrite(8, LOW);
    digitalWrite(9, LOW);
  }
  
  if (nilaisensorldr >=301 && nilaisensorldr <=600)
  {
    digitalWrite(8, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(9, LOW);
  }

  if (nilaisensorldr >=601 && nilaisensorldr <=1015)
  {
    digitalWrite(9, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
  }

}