mtk64erp

homebrew keyboard with thumb operated trackball & rotary encoder.

  • RP2040 MCU

    Uses RP2040 16Mbyte Type-c connection model.
    High speed and large capacity.

  • PixArt PMW3389 Trackball sensor

    Maximum resolution 16,000cpi
    Acceleration 50g
    Tracking speed 400ips.

  • AlpsAlpine EC12D rotaly encoder

    Number of clicks : 30
    Number of pulses : 15
    click torque : 5±3mN・m
    Switch actuation force : 3N
    Operating life : 15,000 cycles