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tryadactyl
Methodology for custom tuning a concave, column-staggered, split keyboard with thumb clusters (AKA Dactyl). Centered on an OpenSCAD library for designing all sorts of ortholinear-ish keyboards supporting a variety of keycaps including Cherry profile. Additionally supports trackpoints, and 5-way navigation switches.
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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.
There is a PR on ZMK for PMW3360 sensors, and someone here has a ZMK trackball. The bastardkb kit ships with a PMW3360, so it is possible. The bastardkb discord is super helpful with troubleshooting and modding, pretty sure they could tell you more.
here's my handwire: https://github.com/wolfwood/tryadactyl