You can build your own trackball. If you're incorporating mouse functionality into a split keyboard, an optical sensor is ideal. This kit includes a PMW3360dm-t2qu sensor and a lens cover. Kit Contents: ☑️ PMW3360 Sensor x1 ☑️ Lens Cover (for protection & focus adjustment) x1 Main Uses: Adding mouse/trackball functionality to a custom keyboard Developing an original trackball Creating input devices for left-handed use or CAD operation assistance Custom control is also possible through integration with STM32 or RP2040 Recommended for: "I want to build my own trackball keyboard." "I want to output mouse signals from a sensor." "I want to try a low-latency, high-precision optical pointer." ⚠︎ Important Notes: Assembly, firmware development, and wiring must be done by the user.