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nano-trackball
A very small trackball-only mouse. Mechanical files, PCBs, and firmware all included.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I was going to just direct you to the aball project but it looks like it doesn't actually give you much info about how/why it's wired to the sensor. All that is on this breakout PCB, which might be worth ordering if you're in America? Turns out it's not the ADNS5050 like I remembered anyway - it uses the ADNS9800 instead.
The Ploopy Nano does use the ADNS-5050 though! And the schematics for how they've connected it are available here.
Looks like this project hasn't been updated in a while. But you can try this for a library to use. https://github.com/okhiroyuki/ADNS5050