Arduino RPM Counter / Tachometer Code

Arduino projects, make arduino rpm counter with arduino.   Instruction; 1) Connect all jumper wire as shown in diagram. 2) Connect IR LED to digital pin 13. 3) Connect IR Phototransistor (dark) to digital pin 2. Make sure shorter lead connected to digital pin 2 and longer lead to Ground. Upload this code to your arduino /* * Optical Tachometer * * Uses an IR LED and IR phototransistor to implement an o ...

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