Tachometer is a RPM counter which counts the rotation frequency of a rotating body. Here is an Arduino pro mini based digital tachometer which uses IR sensor module (A combination of IR transmitter and receiver) to detect object for count rotation of any rotating body. As IR transmits IR rays which reflect back to IR receiver and then IR Module generates an output or pulse which is detected by the arduino controller when we press start button. It counts continuously for 5 seconds.
Watch the working of tachometer in the below video:
It's fun, useful and easy to make. Find here the details of this project:
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