In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...
This project demonstrates a contactless, gesture-based fan switch using an ultrasonic distance sensor, Arduino Uno, and a relay module. By simply waving a hand within a certain range (5–12 cm), the ...
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