Hi, I'm looking for some ideas for a project that I'm considering. I'm trying to come up with a pully mounted rotation monitor. I'm considering a fixed optical sensor and a pully mounted reflector, but I also want to explore a completely self-contained pully mounted monitor. I'm looking for ideas for two key components: First, I need a simple rotation sensor, I've considered a solid-state accelerometer, but I'd like something simpler with very little processing required if possible. Ideally, the sensor would be mounted to the pully or to a circuit board mounted on the front of the pully. A fixed optical sensor reading a rotating sensor disk mounted to the pully shaft is probably not an option. Second, I'm looking for an inexpensive rotational energy scavenger. This may be a stretch, and battery power is a possibility, but i'm open to suggestions.
Thanks, Gary