void setup(){
pinMode(5, OUTPUT);
pinMode(4, OUTPUT);
pinMode(2, OUTPUT);
}

void loop(){
  int n= analogRead(34);
  if(n<=300){
    digitalWrite(5, HIGH);
        digitalWrite(4, LOW);
    digitalWrite(2, LOW);

  }
  else if(n>300 || n<= 800){
     digitalWrite(5, LOW);
        digitalWrite(4, HIGH);
    digitalWrite(2, LOW);
  }
  else{
     digitalWrite(5, LOW);
        digitalWrite(4, LOW);
    digitalWrite(2, HIGH);
  }
}