Here is a motor speed sensor module, the major goal is to check the rate of an electric motor. The module can be used in association with a microcontroller for motor speed detection, pulse count, ...
16-mm-thick device slashes parts count over standard motion-control solutions Offered as the industry's smallest such device, the AEAS-7500 high-speed absolute encoder module is only 16 mm thick.
That level of resolution is ideal for commutation, high-speed motor control, position/velocity control, and replacement of potentiometers and optical encoders. It’s a low-power 3.3-V (or 5-V) device, ...