this post was submitted on 04 Oct 2023
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Fantastic!
I personally own an old pre-smartphone accelerometer with a built-in acceleration calculator (and what is now considered retro LED display) that pretty much works on the same principle, a free-moving arm is attached to a potentiometer to measure the angle accurately (though that only works in one direction).
The accelerometers we use for crash testing use two little crystals rubbing together, they can pick up changes as little as 0.1G but also remain accurate up to 2000G.