Pretty cool project, several people mentioned it in the recent Steam Controller thread.
Basically you buy a NRF52840 Pro Micro (I bought mine for $8USD), drop a firmware file on it, and you have a alternative wireless puck for the Steam Controller. By pressing button combinations you can switch it to act like a switch/xbox/ps controller letting the steam controller work on those platforms as well. The steam controller supports being paired with two pucks, you just hold R1+A+Steam for pairing one, and L1+A+Steam for pairing two (hold these buttons when turning the controller on).
It is recommended to add an enclosure to protect the chip, if you have a 3d printer there are a bunch of models available to print an enclosure.
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