Hello everyone, I have a project with an arduino uno connected to a smartphone as a display to output data. My question is if it's safe to connect a external battery to arduino's jack input to avoid drawing the smartphone battery? Is it safe to have 2 sources of power? Thank you!

Use external battery on arduino project when using OTG cable

Paul_B September 3, 2021, 6:18am 3

Safe, but not entirely sensible.

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