int greenLed = 11;
int yellowLed = 12;
int redLed = 13;

void setup()
{
  pinMode(greenLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);
  pinMode(redLed, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  if(analogRead(A5) > 500 && analogRead(A5) < 700){
    digitalWrite(greenLed, LOW);
    digitalWrite(yellowLed, HIGH);
    digitalWrite(redLed, LOW);
  }
  if(analogRead(A5) > 700){
    digitalWrite(greenLed, LOW);
    digitalWrite(yellowLed, LOW);
    digitalWrite(redLed, HIGH);
  }
  if(analogRead(A5) < 500){
    digitalWrite(greenLed, HIGH);
    digitalWrite(yellowLed, LOW);
    digitalWrite(redLed, LOW);
  }
  Serial.print(analogRead(A5));
  Serial.print("\n");
}