36 Techniques for Rotation and Rate of Rotation
Tachometers
Non contact measurements of rotation rate can be made with reflected light https://learn.adafruit.com/pro-trinket-tachometer/overview or detection of a moving magnetic field.
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Non contact measurements of rotation rate can be made with reflected light https://learn.adafruit.com/pro-trinket-tachometer/overview or detection of a moving magnetic field.