Dimming LEDs with hardware PWM?

Troubleshooting and Support
3

Yes, I use a Kingbright WP154A4SUREQBFZGW – a 4-terminal common kathode LED. For a schematic see: https://code.hfbk.net/sdiy/daisyy/daisyy-hardware/-/raw/main/images/schematic-1.jpg

I rule out hardware issues, it is on a soldered PCB that works flawlessly and very reliably with my DaisyDuino code. Here my Arduino RgbLed class from said code:

class RGBLed {
  int pin_red;
  int pin_green;
  int pin_blue;

  public:
    RGBLed(int pin_red, int pin_green, int pin_blue);
    void init();
    void off();
    void setColor(int r, int g, int b);
};

RGBLed::RGBLed(int pin_red, int pin_green, int pin_blue) {
  this->pin_red = pin_red;
  this->pin_green = pin_green;
  this->pin_blue = pin_blue;
}

void RGBLed::init() {
  pinMode(this->pin_red, OUTPUT);
  pinMode(this->pin_green, OUTPUT);
  pinMode(this->pin_blue, OUTPUT);
}

void RGBLed::off() {
  digitalWrite(this->pin_red, LOW);
  digitalWrite(this->pin_green, LOW);
  digitalWrite(this->pin_blue, LOW);
}

void RGBLed::setColor(int r, int g, int b) {
  r = min(255, max(0, r));
  g = min(255, max(0, g));
  b = min(255, max(0, b));
  analogWrite(this->pin_red, r);
  analogWrite(this->pin_green, g);
  analogWrite(this->pin_blue, b);
}

Creating the object as follows:

// RGB LED               R    G    B
RGBLed rgb_led = RGBLed(A10, A11, A9);

Of course this all boils down to the analogWrite-function from arduino.h