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A comment on Tomu – An ARM microprocessor which fits in your USB port. Parent comment

Re:Tomu – An ARM microprocessor which fits in your USB port by fredley on Thursday September 02, 2021 @03:43PM (#28396457)
This is an extremely cursed idea, I love it.
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Re:Tomu – An ARM microprocessor which fits in your USB port by photojosh on Thursday September 02, 2021 @07:37PM (#28398716)
Not Bluetooth, but tempting to give this idea a try using a sub-$1 microcontroller [0] implementing a software-defined radio with a PCB trace antenna which is powered from the kinetic energy when you actually hit the key.

[0] https://jaycarlson.net/microcontrollers/

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Re:Tomu – An ARM microprocessor which fits in your USB port by codezero on Thursday September 02, 2021 @07:13PM (#28398517)
Now pairing the A key.
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