The project has got an IMU, a Pimoroni trackball, and a good few buttons to perform actions or switch modes, and it’s powered by a tiny Bluetooth ... ring lets you do that, no need to hold your ...
and [Kevin]’s Arduboy ring (link dead, try Internet Archive) is one of the best examples we’ve seen yet. Inside the Arduboy is an nRF51822 – a chipset with Bluetooth Low Energy, an ARM ...
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