int redPin = 4;
int greenPin = 3;
int bluePin = 2;
int potPin = A0;

int potValue;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(potPin);
  
  if (sensorValue < 341) {
    analogWrite(redPin, 255);
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 0);
  } else if (sensorValue >= 341 && sensorValue < 682) {
    analogWrite(redPin, 0);
    analogWrite(greenPin, 255);
    analogWrite(bluePin, 0);
  } else {
    analogWrite(redPin, 0);
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 255);
  }
}