Simple Simon  wrote:
> Brilliant - many thanks - works a treat - I was almost there!!

I'm curious... does this actually work for low battery detection?

Unless you're wiring the Pi directly across a battery that's giving out
somewhere around 5V (for example a 6v lead acid), most of the time you'll
have a voltage regulator between you and the battery.  That regulator will
aim to keep providing 5V as the battery is going flat.  When the voltage
sags below 5V it means the battery is so empty it can't maintain that, which
means it's in a very steep part of the voltage decline.

I'd expect it to be so steep you don't get enough time to do any meaningful
shutdown, but I could be wrong.  What battery setup do you have and how does
it work out in practice?

Theo

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