int potPin = A0;
int redLedPin = 9;
int greenLedPin = 10;
int blueLedPin = 11;

void setup() {
  pinMode(potPin, INPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(blueLedPin, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(potPin);

  if (sensorValue >= 0 && sensorValue <= 341) {

    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    digitalWrite(blueLedPin, LOW);
  } else if (sensorValue > 341 && sensorValue <= 682) {

    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
    digitalWrite(blueLedPin, LOW);
  } else if (sensorValue > 682 && sensorValue <= 1023) {

    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, LOW);
    digitalWrite(blueLedPin, HIGH);
  }
}