Arduino Blog » Blog Archive » A simple Arduino-based tachometer

The circuit is very simple: an IR led is coupled with an IR phototransistor to detect possible interruptions of the light beam, while the Arduino is responsible to calculate the time interval between two such events. Finally, a LCD is used to display
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Technorati Tags: arduino, Blog Archive, Interruptions, Ir Led, Light Beam, phototransistor, Tachometer, Tachometer Circuit, Time Interval

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