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Abnormal conditions Voltage to low

Started by w8one, October 13, 2024, 08:57:44 PM

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w8one

  I have 2 RPI 3b+ with (original) falcon pi caps after upgrading to 8.2 both are telling me Voltage to low. The one on my desk is verified by multimeter at 5.2 v (it was 5.0v) and still get error. Haven't tested the other one yet. Is there a setting in fpp for the voltage that the error happens or a off command for the voltage check?
  
Quando omni flunkus moritati

Poporacer

Quote from: w8one on October 13, 2024, 08:57:44 PMafter upgrading to 8.2 both are telling me Voltage to low.
They added a feature in 8.x to read the Pi status messages, that is why you didn't see it before. That doesn't mean that the low voltage hasn't existed.

Quote from: w8one on October 13, 2024, 08:57:44 PMThe one on my desk is verified by multimeter at 5.2 v (it was 5.0v) and still get error.
The Raspberrry Pi will report that there HAS BEEN a low voltage at anything below 5 V.... Yes, 4.99 will trigger it. This is a historical message. If there is a lightning bolt over the Raspbery Pi Logo, that means that the Low Voltage is right now. This error is common on boot up and should go away after a couple minutes.

If to err is human, I am more human than most people.

MikeKrebs

I think FPP is just returning and displaying a "built-in status" bit. There is a "system" on the RPi that checks for voltage and/or current and sets a flag when an internal value is reached (or not reached as in voltage). On the 3 and 4, it uses this power management subsytem https://www.maxlinear.com/news/press-releases/2019/maxlinear%E2%80%99s-mxl7704-pmic-powers-the-raspberry-pi-4 Other forums say the low voltage is triggered at 4.63 and according to the data sheet it could be anywhere from 4.52v to 4.7v (variance depending on direction of voltage and internal variances).

What is powering the RPi? Does it meet the minimum requirements?

The code looks like it was "Change way pi voltage error is detected to hopefully work on pi5" so it might not be working on a 3B+? I have a Raspberry Pi 3 Model B Rev 1.2 and do not have the warning (upgraded FPP tonight). So my power supply must be adequate. We have reports on the forums of random and unusual problems that are resolved by getting a new (often bigger) power supply because various RPi subsystems are affected differently by power variances from certain activity (such as activating a radio or a USB connection). Do you have any USB plugged in? If so, is it self powered or just using the RPi juice?

I think you can ignore the error although I would find a different power supply and see if that resolves it. Is it causing the RPi to shut down?

I see Poporacer hopped in while I was researching and typing. He would probably know if there is a way of turning off the message. I did not see the option anywhere and the code doesn't seem to invoke a "if turned off, don't do this". 

Are you seeing the message go away? According to another site, there is a way to mask the bit and turn it off (ie reset it). If you have low voltage, it likely would come right back but you could try it.

I wonder if delaying FPP startup would help? I would not think it would but the RPi would be trying to do a bit less during startup thus saving some juice for when FPP starts up a few seconds later.


It looks like the status it is checking can be seen in Help/Troubleshooting Commands/RPI utilities? Check the RPI info section for the Throttled flag  : throttled=0x0. What does yours say?

If you do research, you will find people who say their RPi is fine at 5v and others that say that 5.1, 5.2 or 5.3 is needed to avoid the lightning bolt.

Other references (there are many hits related to this in google):
https://forums.raspberrypi.com/viewtopic.php?t=308962
https://raspberrypi.stackexchange.com/questions/139608/does-raspberri-pi-recover-from-throttling
https://forums.raspberrypi.com/viewtopic.php?t=241736 

jnealand

i have found this error only occurs if you have a PiHat/Cap.  I have tw0 Pis with hats each that are connected to 100 watt power supplies, Meanwell LRS-100-12, and with no strings attached will throw the error.  I put them back on FPP7.5 and no longer get the annoying error warning.  There needs to be a way to turn it off.  We have lived thru 7 previous versions of FPP without the annoying message and I'm sure we can live without it in the future.  I think the message should be there as part of the troubleshooting under the help menu, but that is all.  I have 13 production FPPs and plan to stay on 7.5 for now.  I don't need a bright red message eating up screen space when the condition does not impact units (at least the 7 units that have hats on them).
Jim Nealand
Kennesaw, GA all Falcon controllers, all 12v Master Remote Multisync with Pi and BBB P10 and P5

w8one

  So at random my brain decided to turn on the lights yesterday. When booting i just clicked to see if there was a new version and there was 8.1. I installed the ffpos on my 3 pies that are in use, and waited then did the upgrade and left them to it. When i came home it said there was a update to 8.2 so i ran it. Two pi's are 3b+ with hats the 3rd one is a zero running a small matrix via a colorite card. Just the 3b+'s with the original falcon pi caps are showing a power error. The inside one is powered by a 10 amp 5v wire frame power supply and is running 100 pixels. I measured it at the power out for pixels at 5.0v and adjusted it to 5.25v and is still showing the error and the lightning bolt at the pi logo. The one on the porch is running a 12v 40 amp power supply running 400-500 pixels, so its using the voltage regulator on the pi cap to power the pi. 
Quando omni flunkus moritati

dkulp

The original PiHat's used a 1.5A buck to convert from 12V to 5V.    The is WAY under spec for Pi3b+ or Pi4's.   That is why you are seeing the error.   The warning is correct, it's under powered.  It may "work", but unpredictable and unexpected things may occur.   We have no idea what those symptoms may be.   USB devices could drop off, peripherals may stop working, etc...  
Daniel Kulp - https://kulplights.com

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