ller library, BUT: For driving 64x64 matrices, this boards/shield requires soldering: You need to connect P4 to GND and P8 zu #E. Either solder two small wires or jumpers like I did (see pictures: before/after). This would be easier if the board already came with jumpers in the right place. I found the tip here: https://w2.electrodragon.com/Board-dat/MPC/MPC1073-DAT/MPC1073-test-log-dat/MPC1073-test-log-dat.md#more-demos However, contrary to what it says there, --led-multiplexing=0 (instead of 1) did the trick so this demo worked after soldering: sudo examples-api-use/demo --led-rows=64 --led-cols=64 --led-multiplexing=0 However, I get quite a bit of ghosting/artefacts when displaying small images and animations on a chain of just 2 64x64 matrices, even after tweaking with things like --led-pwm-lsb-nanoseconds 50 and --led-limit-refresh=240. Thus, driving two 64x64 matrices already seems to be the limit of what the hzeller library and a Pi4B can do, because of the many address lines that 64 x 64 matrices have.
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2. Try the python demo code here: https://w2.electrodragon.com/gollum/search?q=CH423-dat.md Thank you!
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2W It is working great, and the 3rd connector is not being used. I also want to add your I2C to GPIO IO Expander Breaktout Board CH423 as I need 4 more GPIO pins from the Pi. Can I, or how do I connect the expander Board to the HAT or the Pi Zero? Or can I use the spare HAT connector to add 4 GPIO pins Thanks.
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age may vary. I used it on a PI5 with this library: https://github.com/bitslip6/rpi-gpu-hub75-matrix, and was able to get 9600Hz operation for 64x64 panels. There is no issue with this hardware and any PI model, only your software and OS configuration. 5 stars.
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