void setup() {
  // put your setup code here, to run once:
  pinMode(A0, INPUT);
  pinMode(2, INPUT);

  pinMode(A1, INPUT);
  pinMode(3, INPUT);

  pinMode(A2, INPUT);
  pinMode(4, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(analogRead(A0) >512){
    digitalWrite(2, HIGH);
  }
  else if (analogRead(A0) <512){
    digitalWrite(2, LOW);
  }
   if(analogRead(A1) >512){
    digitalWrite(3, HIGH);
  }
  else if (analogRead(A1) <512){
    digitalWrite(3, LOW);
  }
   if(analogRead(A2) >512){
    digitalWrite(4, HIGH);
  }
  else if (analogRead(A0) <512){
    digitalWrite(4, LOW);
  }
}