Comments (1)
Hi! Thanks for your kind words about my work, I'm really pleased people are finding it fun, interesting or informative to some degree :-)
You are pretty much in luck, these trackball modules out put PS/2 signals and are very well supported in QMK, which is a very popular firmware for keyboards.
If you are using QMK already, here's the relevant portion of the docs:
https://docs.qmk.fm/#/feature_ps2_mouse?id=ps2-mouse-features
I implemented it just as described in the docs using the USART method as I had the proper pins available and it produces the best results. For my mounting orientation I had to rotate the output by 270degress, which is a simple config option already in QMK. I think I also played with the speed scaling to find something that seemed right for my screen size and tastes.
If you have any questions, or if you are using some other firmware/language let me know and I'll do my best to help!
Good luck on the project!
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