Hi, I'm building an "old time" music box, that plays music automatically.
An I wanted to add a handcrank, to make it more "Classical".
I'm not looking to power via a hand crank. I just want the music to play according to the speed which the crank is being turned. The machine is still powered externally (or with a battery).
What would be a simple approach to measure how fast something is being turned? I remember something from grade school where a gear would click on switch, and you could measure how many times the switch was hit (Sort of like how some mouse wheels work).
Is there a name for such a componnent? Is there a simpler approach? (I'm a software guy, I'm not good with building H/W)