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Arduino Tutorial: IR Transmitter and IR Receiver (HX-M121, HX-53, KY-005, KY-022, Keyes, Iduino, Open Smart,…)

This Arduino tutorial gives an introduction to the "IR transmitter" and "IR receiver" modules (HX-M121, HX-53, KY-005, KY-022, YL-55, (Keyes, Iduino, Open Smart,...).

Arduino Tutorial: HY-M154 / 817 / PC817 Optocoupler Module

Tutorial on how to use HY-M154 / 817 optocoupler modules with Arduino. Includes wiring diagram and programming example.

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