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, ...
This image sensor module is equipped with an InGaAs linear image sensor. IT has sensitivity in the near infrared region of 0.95 to 1.7 μm, and is capable of readout at a high-speed line rate of 40 ...
A while back we featured a magnetic rotary encoder that [LongHairedHacker] designed. The heart of the system is an AS5043 magnetic rotary sensor which runs from $6.5-$11 and has a 10 bits precision.
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