TUTORIAL: How to Make an Automatic Transfer Changeover Switch with Contactors & Arduino! (Misc)


This is a comprehensive guide on how to make your own DIY changeover switch using contactors, Arduino & transistors. It's suprisingly simple! Note: From the Arduino pins to the base pins, there should be resistors. The resistor may be around 1k. The resistors should be large enough to minimise current being drawn from the microcontroller, yet not too great that it prevents the transistor from being turned on. You may also need to consider back-EMF (Although I've been using this setup for a year without any issues). Thanks to Xanataph for his comment!


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