Alternatively lookup the right driver for CA. Since Nch FETs are better with sink RdsOn, this why the topology for CC. I have tried some higher resistors to no effect. 1 Answer Sorted by: 0 It is designed for common cathode (CC) LEDs not CA. I have a 1uF capacitor between the power and ground. I'm using a 10k resistor between pin 16 and the power on the max7219. I have read that the max7219 cannot drive some higher-power White LEDs because of voltage requirement, but since all of the White Matrix seems to power up, I'm not sure that is the problem. through hole 32 pins LED matrix display module LED matrix module suface color:black or grey, and LED dot color: white or water clear. When I start to send data to the max7219, the next Green array driven by the second max7219 displays the appropriate image, but in the White Matrix all of the LEDs remain on, but their brightness seems to dim slightly with the data changes.
Here's what happens when I swap out the Green Matrix for the White Matrix on my breadboard: All of the LEDs on the White Matrix power on immediately when the power to the Arduino is turned on. I figured (not knowing too much about electronics) that since the pin configuration of the matrix was the same, this wouldn't require too much require too much fiddling to get the White Matrix to work. For the project that I'm working on, I decided to switch from a Green LED matrix:
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