Arduino on X: "Turn an old trackball mouse into a MIDI controller that can unlock new ways of making digital music! https://t.co/SYSGAb45HN https://t.co/z3JxhI4ILs" / X
Measuring displacement with Parallax Trackball - Sensors - Arduino Forum
Grove - Mini Track Ball | Seeed Studio Wiki
CH Products Trackball Pro USB modding | Details | Hackaday.io
Arcade-Trackball | Arcade Trackball - based off Spinner version 2