[Solved / Archived] WittyPi 4 L3V7 with Buster OS and Pi 4B - Does WittyPi 4 L347 have issues with Buster OS and Pi 4B?

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Last Post by uugear 1 month ago

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CraigXty

(@craigxty)

Posts: 1

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Topic starter

My Witty Pi 4 L3V7 is not shutting down the Raspberry Pi 4 when voltage in is at 3.5 or lower and the low voltage threshold is 4.0. When it turns of at a much lower voltage than 3.5 it does a shutdown of the Pi but does not turn off the power to the Pi.

Is there an issue with using the Buster OS that causes these problems?

I am using Buster to have the omxplayer video player.

Thank you for any feedback anyone has!

Posted : 24/07/2024 8:00 pm

uugear

(@admin)

Posts: 421

Member Admin

Detecting low voltage against the battery voltage is done by the firmware, which runs in the MCU (ATtiny841). This functionality has nothing to do with the OS running on Raspberry Pi.

When low voltage is detected and the firmware initialise a shutdown signal (pull down GPIO-4), the white LED on Witty Pi will lights up for a few seconds. Have you seen this behavior?

There may be some useful information in the wittyPi.log file too.

Posted : 25/07/2024 8:29 am