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microcontroller - Counting pulses using Arduino Uno - Electrical Engineering Stack Exchange
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Up Down Counter using Arduino & 7-Segment Display - The Engineering Projects
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analog input counter - Project Guidance - Arduino Forum
Build Tachometer or RPM counter using optocoupler - miliohm.com
![contest] My 12 input high precision pulse counter (kWh/ W) | MySensors Forum](https://forum.mysensors.org/uploads/upload-d7f3cd56-fa1a-4896-86e6-4476c226ef89 "contest] My 12 input high precision pulse counter (kWh/ W) | MySensors Forum")
contest] My 12 input high precision pulse counter (kWh/ W) | MySensors Forum
An object counter using an IR sensor and Arduino
