Arduino IR tachometer
Chris from Pyroelectro has posted this tutorial detailing the use of an IR transmitter and receiver break-beam pair to measure the speed of a fan. The IR components are used in conjunction with the Arduino UNO which processes the break-beam interruption counting with the result displayed on a 16×2 LCD display.
You can get the details on this project, along with schematic and Arduino code at Chris’ Pyroelectro website.
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