CommentStreams:E36cfce896e17b91977449f1dad60eb1

I have looked into the schematic, created a minimal modification of the Geekworm UPS hat and additionally have created a small board that implements the missing functionality. This board can be created even with beginner‘s soldering skills, all as open source. Please see the following link: https://github.com/jbaumann/attiny_daemon

By the way, I‘m the Joachim whose sample code is referenced above.