int value;
int pot = A0;
int redLED = 2;
int greenLED = 3;
int blueLED = 4;

void setup() {
  Serial.begin(115200);
  pinMode(pot, INPUT);
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);
}

void loop() {
  value = analogRead(pot);
  int M = map(value, 0, 1023, 0, 10);

  Serial.println(M);

  if (M >= 0 && M <= 3) {
    digitalWrite(redLED, HIGH);
    digitalWrite(greenLED, LOW);
    digitalWrite(blueLED, LOW);
  } else if (M >= 4 && M <= 6) {
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, HIGH);
    digitalWrite(blueLED, LOW);
  } else if (M >= 7 && M <= 10) {
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, LOW);
    digitalWrite(blueLED, HIGH);
  }

  delay(100); 
}