Error log

[Broady2067]

Can someone tell me what these errors are and if there is a fix please?

 

[Sral]

Well, the first means that ReefPI could not aquire I2C-Bus access. Not sure if that is spurious, or persistent. I believe the I2C-Bus interface needs to be activated on the raspi-config. Did you do that or alternatively, install Reef-Pi using @robsworld78's install-script from his website ? His script does it for you, if I'm not mistaken.

The second means that your Pi's power control-chip signaled an input voltage that's considered "too low for comfort". This might either result from a bad power supply or from a delusional power control-chip. I believe I heard somebody mention that some Pi 4's have strange power control chips that constantly message under-voltage even though input voltage is stable and good.
What power supply and Pi are you using ?

 

[Sral]

Okay, judging from your Build-Thread it looks like a standard LM2596 DC/DC Buck converter. I guess that can deliver about 2-3A @ 5V to the system. What are you powering with that ? Doesn't look like much, but that's the typical place to start.

What output capacitor does that DC/DC converter module have ? Can you find a marking ?

 

[Broady2067]

Okay, judging from your Build-Thread it looks like a standard LM2596 DC/DC Buck converter. I guess that can deliver about 2-3A @ 5V to the system. What are you powering with that ? Doesn't look like much, but that's the typical place to start.

What output capacitor does that DC/DC converter module have ? Can you find a marking ?

That looks like Greek to me. I will check what i think you are referring to. I am a complete newbie.

 

[Sral]

That looks like Greek to me. I will check what i think you are referring to. I am a complete newbie.

I’m mostly interested in the capacitance, probably a 3digit number with a ‚u‘ or ‚uF’ behind it for micro Farad.

 

[Broady2067]

I’m mostly interested in the capacitance, probably a 3digit number with a ‚u‘ or ‚uF’ behind it for micro Farad.

this is the one installed.

 

[Sral]

this is the one installed.

Curious. The datasheet actually mentions a 330µF output capacitor for an output current up to 3A on page 5, this one is a 220µF. Might be a little too low for one of the larger PIs, like a Pi 4.

It might be an interesting experiment to add a 100µF capacitor on the output to see if that eliminates the "low voltage warning", but I would not test that if the warning doesn't happen regularly. If it works without crashing or other problems, it works.

 

[Broady2067]

Curious. The datasheet actually mentions a 330µF output capacitor for an output current up to 3A on page 5, this one is a 220µF. Might be a little too low for one of the larger PIs, like a Pi 4.

It might be an interesting experiment to add a 100µF capacitor on the output to see if that eliminates the "low voltage warning", but I would not test that if the warning doesn't happen regularly. If it works without crashing or other problems, it works.

Hi @Sral, not sure if this has any bearing on the issue but i am running PI 3b+.

 

[Sral]

Hi @Sral, not sure if this has any bearing on the issue but i am running PI 3b+.

It’s definitely useful info. There was somebody else who had this problem and tried a few things, as you can see in this thread.

Since nothing changed the messages, although the System was running without issues in his case, I think we decided that it’s probably a faulty threshold on the power chip and ignore it.