From Pi My Life Up:
In this Raspberry Pi Wiimote controllers guide, we will walk you through the process of setting up a Wiimote on your Raspberry Pi and show you how to setup both cwiid and wminput.
Utilizing Wiimote controllers on the Raspberry Pi can be painful to deal with due to its handling of the Bluetooth stack. While they run over standard Bluetooth, their actual functionality is not picked up as a conventional joystick device like Xbox controllers and PlayStation controllers.
Instead to support the full functionality of Wiimote controllers in a way that most applications can support we must utilize two pieces of software.
These being cwiid and wminput. One acts as a library that interprets the Wiimotes actions into joystick actions, the other being somewhat of a driver that creates an input device that applications can utilize easily.

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