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Topic: Uno only works when plugged into USB port (Read 348 times) previous topic - next topic


Apr 29, 2019, 06:03 pm Last Edit: Apr 29, 2019, 06:12 pm by stevenette

I am deploying a bunch of arduino Unos throughout my place, all with the same program and same setup. They are all powered by a 12V battery, and they all work fine, except for one. I have the debug LED blink every loop, and this one just flashes waaaay faster than the rest. My switches and other components I have hooked up to it don't work. That is until I plug in the USB to the laptop. As soon as I do this, the blinking speed is normal, all my components work etc. As soon as I unplug it, everything goes back to malfunctioning. The battery is full, no shorts or loose wires, I can't think of anything else.

If I am missing something I would appreciate any help. Thank you!

EDIT: I forgot to mention a lot of the previous posts have mentioned a voltage regulator, but I have Xbees hooked up to all of them, and I can talk to it just fine, so it is powered fine.
'Why is this working? '


I am able to use the power off of the 5V output fine without the usb plugged in, but none of the logic is working. Once I plug the USB into the laptop, however, I now have logic control back.
'Why is this working? '


It is possible your Arduino is resetting often because of low power to the MCU or problem with whatever regulator you are using (onboard or off board).   Please post a schematic of your device.   

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