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Topic: Dedicated power pins VS "power-set" pins (Read 75 times) previous topic - next topic


Hello all,

I have come to a weird realization that wanted to cross-check with the forum. It's regarding Arduino Mega: using dedicated power pins (5v and 3.3v pins) VS setting other pins as power pins.

Setting other pins to be consistent power outputs does not seem to work nearly as well as using the dedicated power pins. Is there a reason/fix to this?


Aug 25, 2019, 02:18 am Last Edit: Aug 25, 2019, 02:18 am by lastchancename
I/O pins should NEVER be used to power other components directly - unless they are rated such, and you know EXACTLY what you're doing.

Incorrect result is usually a permanently fried i/o pin.

Use a driver to switch +Vcc or other supply rail as needed - to 'drive' your target device.
Experienced responders have a nose for laziness, (they were beginners once)... Sure, there are trolls, chest-beaters, and pretenders - but the help you'll get here is about as good as it gets - if you try to help youself!.



There are two ways to drive a 'load'.

We'll leave it to you to GOOLE 'low side' and 'high side' switching.

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