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under voltage detected [solved]

Posted: Wed Oct 10, 2018 8:20 pm
by soydepr
have a pi attached to monitor with no keyboard.

I see lines saying under voltage detected (0x000050000000)

what is this, dying?

Re: under voltage detected

Posted: Wed Oct 10, 2018 8:23 pm
by Imperf3kt
No, it simply means your power supply is inadequate.
You need one that supplies 5v at about 2Amps or more (2.5 for a Pi3b+)
Don't trust the labelling too much on phone chargers, it isn't uncommon for them to be less than truthful.

Re: under voltage detected

Posted: Wed Oct 10, 2018 8:27 pm
by soydepr
care recommend one

Re: under voltage detected

Posted: Wed Oct 10, 2018 8:38 pm
by drgeoff
soydepr wrote:
Wed Oct 10, 2018 8:27 pm
care recommend one
The official RPi one is highly recommended.

Re: under voltage detected

Posted: Wed Oct 10, 2018 8:38 pm
by soydepr
link please

Re: under voltage detected

Posted: Wed Oct 10, 2018 8:46 pm
by Imperf3kt
Where do you live (country is enough) , would help us give you a link of any use.

You could also look on the main suite, it has links to all the Raspberry Pi products.

Re: under voltage detected

Posted: Wed Oct 10, 2018 8:48 pm
by soydepr
U.S main suite ?

Re: under voltage detected

Posted: Wed Oct 10, 2018 9:48 pm
by LTolledo
Get a proper Power Supply Unit (not just any phone charger nor your PC/Mac's USB port!)

If RPi3B or RPi3B+ : use 5v 2.5A and up, cable must be 18AWG or at least 1.0mmsq
if RPi2B : use 5v 2.0A and up, cable must be 18AWG or at least 1.0mmsq
if RPi1B+, RPiZ/W : use 5v 1.5A and up, cable must be 20AWG or at least 0.75mmsq
if RPiA+ : use 5v 1.0A and up, cable must be 20AWG or at least 0.75mmsq

5v must not go below 4.9v nor beyond 5.15v

Re: under voltage detected

Posted: Wed Oct 10, 2018 9:57 pm
by davidcoton
LTolledo wrote:
Wed Oct 10, 2018 9:48 pm
5v must not go below 4.9v nor beyond 5.15v
That's a bit cautious. The Pi spec allows 4V75-5V25 at the microUSB socket. Those limits should be maintained from Pi shutdown to full load.

Re: under voltage detected

Posted: Wed Oct 10, 2018 10:06 pm
by LTolledo
davidcoton wrote:
Wed Oct 10, 2018 9:57 pm
LTolledo wrote:
Wed Oct 10, 2018 9:48 pm
5v must not go below 4.9v nor beyond 5.15v
That's a bit cautious. The Pi spec allows 4V75-5V25 at the microUSB socket. Those limits should be maintained from Pi shutdown to full load.
Better safe than sorry and regret later.....

Re: under voltage detected

Posted: Wed Oct 10, 2018 10:23 pm
by Heater
The happiest Pi I have is run from a 5v supply that can deliver 4 amps.

But this supply can be tweaked up and down a bit by winding a trim pot.

Turns out the Pi is happiest when the supply is outputting 5.3 volts or so.

It amazing how much voltage can be lost through short lengths of cheap skinny USB cables.

Re: under voltage detected

Posted: Wed Oct 10, 2018 11:13 pm
by Imperf3kt
Heater wrote:
Wed Oct 10, 2018 10:23 pm
The happiest Pi I have is run from a 5v supply that can deliver 4 amps.

But this supply can be tweaked up and down a bit by winding a trim pot.

Turns out the Pi is happiest when the supply is outputting 5.3 volts or so.

It amazing how much voltage can be lost through short lengths of cheap skinny USB cables.
I'm more inclined to blame the connections on the ends of those cables.
I once bought the cheapest, crappiest cable I could find and plugged it into a known good 5A source. Naturally it failed to deliver enough current to even sit idle at the Raspbian desktop.
But, as soon as I lopped off the microUSB connector and applied power to the GPIO header, there was no more undervolt detected.
Make of that what you will.

Re: under voltage detected

Posted: Thu Oct 11, 2018 1:51 am
by soydepr
stange the one I have came with the PI as a kit

Re: under voltage detected

Posted: Thu Oct 11, 2018 1:51 am
by W. H. Heydt
LTolledo wrote:
Wed Oct 10, 2018 9:48 pm
if RPi1B+, RPiZ/W : use 5v 1.5A and up, cable must be 20AWG or at least 0.75mmsq
if RPiA+ : use 5v 1.0A and up, cable must be 20AWG or at least 0.75mmsq
I'm skeptical about that particular set of requirements. I tested a Pi0+3.5" display (GPIO mounted) and the whole thing drew less than 250mA, and most of the time it ran at about 185mA. The B+ is, IIRC, spec'd for and polyfused at 1.1A, so a 1.5A PSU is mild overkill. An A+ should run on more like 500mA, even under load. The Pi0, Pi0W, and A+ all lack the rather power hungry LAN chip, and with only one USB port really don't need enough power to output more than 500mA, max. and probably a good deal less in most cases.

The main thing, though, is that the Pi0 and Pi0W should not be lumped in with the B+. They have a lot more in common with the A+.

Re: under voltage detected

Posted: Thu Oct 11, 2018 2:10 am
by Imperf3kt
soydepr wrote:
Thu Oct 11, 2018 1:51 am
stange the one I have came with the PI as a kit
Most kit resellers package their own PSU, not the official PSU.

Does it have an attached cable, or do you plug in a usb cable?
If you plug in a usb cable, then it might be the cable and not the PSU

Re: under voltage detected

Posted: Thu Oct 11, 2018 11:42 pm
by soydepr

Re: under voltage detected

Posted: Fri Oct 12, 2018 10:36 pm
by HawaiianPi
soydepr wrote:
Thu Oct 11, 2018 11:42 pm
attached!!!

https://www.amazon.com/CanaKit-Raspberr ... berry+pi+3
The Canakit PSU is okay (I've had one), but the official Raspberry Pi Universal Power Supply is better. I've seen the Canakit PSU dip a little below 5V under load, but not enough to cause a low voltage warning (at least mine didn't).

What else do you have connected to your pi that is drawing power?

Are you using the case from the kit?

Anything else connected between the PSU and Pi (power switch, etc.)?

Re: under voltage detected

Posted: Sat Oct 13, 2018 11:01 am
by soydepr
yes using the case .

only thing connected is a hdmi monitor, nothing else, no keyboard no mouse

Re: under voltage detected

Posted: Sat Oct 13, 2018 11:26 am
by HawaiianPi
Sounds like your power supply is not outputting what it is supposed to. With nothing but HDMI connected the Canakit PSU should work fine. I used mine on my Pi3B with an external USB hard drive. Try contacting Canakit to see about a replacement.

Re: under voltage detected

Posted: Sat Oct 13, 2018 11:50 am
by fruitoftheloom
Never had issues with Official PSU:

https://www.raspberrypi.org/products/ra ... er-supply/

Re: under voltage detected

Posted: Wed Mar 06, 2019 9:41 am
by ebolisa
Sorry for resurrecting this post but I've a doubt...

I'm running a B+ with updated debian stretch plugged in the extension board seen here: https://www.kubii.es/tarjetas-de-extens ... 13346.html
The 5V is fed via pins 2 & 4 as per the extension's board design (so, not through the USB connector).
The PS used is a 5V 3A as shown here: https://www.meanwell.co.uk/dr-30-5.html

However, I'm still getting the following messages
Under-voltage detected! (0x00050005) / Voltage normalised (0x00000000)


So, I'm suspecting that the Pi's voltage sensing is done within the USB circuitry otherwise, I cannot understand the message.

Any help/ideas is appreciated.
TIA

Re: under voltage detected

Posted: Wed Mar 06, 2019 9:48 am
by Brandon92
Did you measure the output voltage of that power supply. Because you have the option to adjust the output voltage. And are you using as a wire?

Re: under voltage detected

Posted: Wed Mar 06, 2019 9:57 am
by ebolisa
Hi,

The input voltage at the extension board is 5.2V and less than 1A.
I'm using 1.5 mm wires to feed the extension boad if it's what you mean by
And are you using as a wire?

Re: under voltage detected

Posted: Wed Mar 06, 2019 10:43 am
by jamesh
ebolisa wrote:
Wed Mar 06, 2019 9:41 am
Sorry for resurrecting this post but I've a doubt...

I'm running a B+ with updated debian stretch plugged in the extension board seen here: https://www.kubii.es/tarjetas-de-extens ... 13346.html
The 5V is fed via pins 2 & 4 as per the extension's board design (so, not through the USB connector).
The PS used is a 5V 3A as shown here: https://www.meanwell.co.uk/dr-30-5.html

However, I'm still getting the following messages
Under-voltage detected! (0x00050005) / Voltage normalised (0x00000000)


So, I'm suspecting that the Pi's voltage sensing is done within the USB circuitry otherwise, I cannot understand the message.

Any help/ideas is appreciated.
TIA
In future, rather than ressurecting an old thread, just start a new one.

Re: under voltage detected

Posted: Wed Mar 06, 2019 10:54 am
by ebolisa
Will do but I thought to follow through for being the same subject.