I have an issue with my LED matrix driver current. Maybe one of you knows more an can help me out.
I use the LedControl library, I set the brightness to maximum (15) and I tested values for RSet between 10k and 28k.
The highest LED current I measured was 2.5mA, whereas my LEDs can take at least 20mA. How do I get a higher LED current, without adding a transistor to every LED?