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Topic: Dual power supplies - which pulls first? (Read 46 times) previous topic - next topic

dynamicsallen

Hello, I'm working on a project that will keep my arduino outdoors. I am planning to run a 6 cell AA to the DC and have a solar setup from another project that runs to USB. My question for you experts is - if I have both plugged in, which will the unit pull from? One vs the other, or both? I'd like to have the solar as the primary (USB) and the 6 cell AA as backup (DC). Thanks for your help.

WattsThat

#1
Today at 04:58 am Last Edit: Today at 05:06 am by WattsThat
Depends on the board.

If it's an Uno and both usb and the dc jack have power, the the dc input will take priority when it is greater than ~ 7.0 volts.
Vacuum tube guy in a solid state world

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