An adequate CircuitPython-compatible library for using the Pimoroni Trackball module as a mouse. Based on Pimoroni's official Python library, which is incompatible with CircuitPython.
I don't have a totally clear understanding of how the Pimoroni Trackball works under the hood or why their official library does some of the things that it does. Anyway, I find the Trackball unsuitable for desktop OS use as it loses precision at higher acceleration/sensitivity value (set by the multiplier in the code.py file). Maybe someone smarter than me can fix this, but I suspect it's a hardware issue (e.g. the ball is too small to have the precision of a traditional trackball mouse).
This code is tested to work with CircuitPython 7 and two of the libraries from the Adafruit CircuitPython 7 bundle:
- adafruit_bus_device
- adafruit_hid