Thingiverse

Hall Effect Tachometer by tkbletsc
by Thingiverse
Last crawled date: 4 years, 1 month ago
As I was pricing rotary encoders, I realized that I could fabricate a rudimentary encoder/tachometer using just a 3D printer, magnets, and Hall Effect sensors (which detect magnetic field). See this hastily made YouTube.
This customizer makes the disc for basically any magnets and motor you have around.
This customizer makes the disc for basically any magnets and motor you have around.