int potVal;

const int pinPot = A1;
const int pinR = 9;
const int pinY = 3;


void setup() {
  // put your setup code here, to run once:
  pinMode(pinR, OUTPUT);
  pinMode(pinY, OUTPUT);
  pinMode(pinPot, INPUT);

  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  potVal = analogRead(pinPot);
  Serial.println(potVal);

  if (potVal < 256) {
    digitalWrite(pinR, HIGH);
    digitalWrite(pinY, LOW);
  }

  else if (potVal < 512) {
    digitalWrite(pinR, HIGH);
    digitalWrite(pinY, HIGH);
  }

  else if (potVal < 768) {
    digitalWrite(pinR, LOW);
    digitalWrite(pinY, HIGH);
  }
  delay(50);
}