Developer Robert Dale Smith has turned a toy into a working gamepad capable of playing Mario Kart.

Smith explained how the setup works: he used the Seeed XIAO nrf52840 Sense microcontroller. The IMU's roll angle is mapped to either the left or right stick depending on the D-pad mode, enabling gyro-based steering. The project is still in progress, with the top bumper buttons yet to be wired and mapped.

Check out other projects of the developer, including Joypad OS, an open-source controller/controller adapter firmware platform:

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