(I guess the following is a Raspberry Pi issue, rather than HA)
I’m running HA on a Pi 3 B with an uninterruptible power supply, showing a minimum of 5.12 volts on the Pi gpio pins yet I get the HA Core persistently snivelling:
“Under-voltage was detected. Consider getting a uninterruptible power supply for your Raspberry Pi.”
Any ideas anyone, apart from deleting the low voltage warning integration?
But that can be tricky to monitor over a long period of time and the problem may only last a second. My guess is if it’s complaining it is not supplying enough power. Easier to.read the specs on the power supply than try to catch the moment it draws too much power.
Volt means nothing.
Watt is everything.
Watt is Volt x Ampere.
Your UPS power supply is 8V and 2A, which gives 16A minus the power needed for the UPS controller and some lost in step ups/downs.
Your Pi needs 5V and 2.5A, which gives 12.5V which means the UPS should be able to provide enough power, if you do not have too much else connected that are power hungry.
Wally is correct. This power warning is quite common on Pis - especially after you’ve hung a SSD and a few coordinator sticks off of it. The voltage may be 5v but you’re emptying the pipe on the amperage. Power needs both.
Powered USB hubs and a quality power supply for the Pi are the answer.
Looks like it was the pogo pins electrically connecting the UPS to the PI!
I took the UPS off and cleaned the GPIO pins that the pogo pins contacted. When I reassembled the UPS to the Pi, I ‘jiggled’ the UPS before fully tightening the screws in order to create an approximation of cold welds between the contacts. It’s now OK, with no griping about low voltage.
Ahh a job for Deoxit… I didn’t realize it was the UPS hat - that’s a pretty common problem with those things - spray some contact cleaner in there and call it a day. Glad it worked.