Hello, I want to use some relays to switch a high power circuit. I have read multiple times that using the Arduino 5V pin to power the coils can be dangerous because they can draw too much current, and I should use an external power supply. So, is it safe to use a relay shield like this one ? I g…

Are relay shields safe?

DrDiettrich October 20, 2021, 12:06pm 6

It won't work. At least not when you gravely need it.

You need an external power supply.

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