My Volumio system is build on RPi and HiFiberry Amp+ (geniue). Everything was working perfectly for last two years.
I just upgraded my RPi 3 B to new RPi 3 B+ v1.3. To have fresh system I flashed recent Volumio image -> volumio-2.457-2018-09-17-pi.img.
Unfortunately on boot and I received Undervoltage detected error. And Volumio is now not working of course.
The RPi is powered from HiFiberry and on pins 2-6 on GPIO I have nice stable 5.02 V - tested with multimeter and oscilloscope.
I’v checked the problem with high quality AC Plug power supply and with Lab desktop PSU. Same results.
I’m electronics engineer so I’m quite sure that problem is not on power supply hardware side.
Then I flash latest Raspbian -> 2018-06-27-raspbian-stretch-lite - zero problems - zero undervoltage warnings.
Then i flash latest LibreELEC - upgraded to 8.9 (Leia beta) - works perfectly even with Full HD 3D Avatar (30GB) or HD Netflix - zero undervoltage warnings.
Tested also with -> volumio-2.382-2018-03-16-pi.img and version 2.389 (via PINN) - this same error.
If you are confidant of your power supply, then why is the RPi reporting an undervoltage? The latest Pi is certainly more of a power hog than previous generations. Have you tried the simple test of supplying the Pi directly with it’s own good quality power source?
Weird, but double check or swap the cable between the PSU and the Pi. Using a too thin cable or somerhing with a to high resistance could cause this problem.
I even had it when a used a usb cable with inline on/off switch.
My experience so far has been quite good with it: did not have any stability issues.
However:
I also have the undervoltage warnings, quite a lot of them (did not have any report with previous PI’s, same software)
We had an higher number of customers returning their PI 3B+ because of hardware faults than previous models.
I have 2 hypothesis:
PI3B+ consumes way more power than its predecessor, and since Volumio runs in “performance” CPU governor by default it will trigger the undervoltage much easily than other distros.
A DAC\AMP board designed for previous generation PIs might not take into account the additioal power requirements of PI3B+.
To see if that’s the case, try to change the CPU governor to ondemand
Didn’t asked them. There is kind of mess on http://www.hifiberry.com
On products page - is still old Amp+ no info about Amp2. But In Shop page there is no Amp+ at all only new Amp2
EDIT: I just opened the support ticket on HiFiBerry web page.
Hi all, I’m very new to this world. I just received my pi3 b+ and I have the same under-voltage warning, but I have no periphericals connected. Only an USB dac.
Any idea on how to solve the problem?
Thank you.
Ps. I wouldn’t send it back in exchange of the previous one…
Set up Volumio on Raspberry Pi 3 B+ and got lot of under-voltage warnings. Investigated this problem and find out that average power draw is very low - no more than 0,5A but there are high pulse currents. Solution is very simple - just put 2200uf 6.3v Low-ESR electrolytic capacitor between +5v and ground on extension connector (+5V pin2, GND pin6) - no more warnings even with standard 2A phone charger.