const int LED_PIN = 9;
const int BUTTON_PIN = 2;  // Button to increase red brightness
int helderheid = 0;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW) {
    if (helderheid < 255) {
      helderheid = helderheid + 1;
    }
  } else {
    if (helderheid > 0) {
      helderheid = helderheid - 1;
    }
  }

  analogWrite(LED_PIN, helderheid);

  delay(20);  // Short delay to limit update speed
}