HAT install and Pi5 Red led

[Adrian]

I'm sorry if that came across as dismissive. I just had too many situations where AI led people astray as the MacArthur HAT is a niche product and not well represented in the training data.

I was confused as you were talking about powering the Pi from USB before. So with the more powerful 12V power supply it works?

[IanRed]

It does work, the AI was the Openplotter AI which I though was synonymous with Macarthur HAT so I too must apologise for being sharp in my response. I wrote a long troubleshooting report which went through all the steps of checking the system through levels 0 to 4. In a nut shell powering with 12v with sufficient current runs superbly.

The net of the report is that the Pi did not log an issue with the 12v or 5v supply, the Macarthur kept the LEDs alight and the enable never dropped. But still the Pi would start, hesitate and fold.

The background to this was only discovered with deep log review, a skill that I never had and had to look up

A similar behaviour was witnessed when powering from the Pi Cable in that the pi would boot, the openplotter would do its testing and then the screen would go black with. Plymouth quick halt message. Only after a lot of head scratching did I realise that the Pi had been told to shut down after a few seconds but was delayed in closing for more than 60 secs by the processes being allowed to close properly before fold which took a minute.

If I may make an observation on the 12v scenario

The document has an article on the GPIO Shutdown and Power Off but it is not central to the installation instructions as far as I could see. I would suggest that it becomes a default as I would imagine most people would purchase the 12v to 5v PSU. Also the PSU_MAX_CURRENT=5000 is in the EEPROM config and not config.txt and needs a different process to update.

Secondly I suggest that a document on powering from the Pi PSU should have a prerequisite to ensure that the GPIOs are disabled that might have been in place for the 12v PSU

Thirdly perhaps a little more description on the Plymouth power handling system beyond the Enable and 12v OR gate would help those trying to understand why the device takes so long to close after the bullet

To be more constructive, I offer to send my troubleshooting document with inline commentary if you would find it useful and I could also offer to assist in proposing some documentation mods. Just let me know.