Invisible pen

Using accelerometer as a hid device, for text input, writing by the index finger in the air

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The idea is to use 3D data from the accelerometer to recognize text, written in a pen mode with the finger in the air. Z axis (or Y, in this case) can be used as a pen up - pen down flag.
I wonder if I can train the µC to resolve the character input with the low enough error rate, but I hope that this can be used for some unusual applications, or as the secret communication device.
Of course, accelerometer chip can be placed on some smaller PCB, in a kind of a ring, or so.

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carlbreindeltt wrote 05/09/2019 at 08:01 point

is there any word on how this project is coming

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