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Undervotage detected while using UPS hat (b) on wheel robot

You're over-loading your UPS-HAT. You haven't actually asked a question, but that is your problem. If you want help, you're going to have to do a better job of illustrating your setup/configuration. ...
Seamus's user avatar
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Power Pi 4 from Viewsonic touchscreen

There's no negotiation from the RPi side; the USB source either supplies the needed power - or it doesn't. If the monitor is actually capable of supplying 57W at 5V (±) then it should work fine... but ...
Seamus's user avatar
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Power Pi 4 from Viewsonic touchscreen

The Pi only operates from 5V. If it doesn't work it is likely the power supply can not supply sufficient current or more likely that the cable is inadequate. The official Pi supply has an inbuilt ...
Milliways's user avatar
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Raspberry Pi 4: turn red LED off (via software)

My first post here but maybe this will help someone else. I have had a bash alias commands to turn the light on my pi 4 on or off for a while. Apparently, they changed the directory, and my bash alias ...
George's user avatar
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