const int redPin = 2;
const int greenPin = 4;
const int bluePin = 3;
const int potentiometerPin = A0;

const int linkerKnopPin = 6;
const int rechterKnopPin = 7;

int redValue = 0;
int greenValue = 0;
int blueValue = 0;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(linkerKnopPin, INPUT_PULLUP);
  pinMode(rechterKnopPin, INPUT_PULLUP);
  analogReference(DEFAULT);
  pinMode(potentiometerPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(linkerKnopPin) == LOW) {
    greenValue = (greenValue + 1) % 256;
    Serial.println("green: " + String(greenValue));
    delay(10);
  }

  if (digitalRead(rechterKnopPin) == LOW) {
    redValue = (redValue + 1) % 256;
    Serial.println("red: " + String(redValue));
    delay(10);
  }

  blueValue = analogRead(potentiometerPin) / 4;

  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}