Just been going back through Isaac's thread from 23/Feb as I'm looking at
something similar
http://www.piclist.com/techref/postbot.asp?by=3Dthread&id=3D%5BEE%5D+Charge=
r+and+power+circuit+for+mobile+equipmen&w=3Dbody&tgt=3Dpost&at=3D2015012310=
4616a#104616a

and have a couple of related questions;

- if using a momentary button, switching to ground, to latch the power
supply (MCU holding it there), is it possible to re-use that button for
input purposes?  I currently have two buttons switching to ground used as
inputs, but no latched power system.  I'd like to disable the buck-boost
on complete shutdown, but don't have room for additional switches, and
double-pole switches of the style I'm using/need don't seem to exist.

- what type of diodes were D1, D2, D3?

- if I always need both 3.3V and 5V from a li-ion when in operation, with
the ability to boost from a min of about 3.0V, is there much benefit to
using two buck-boosts, over one buck-boost to 5V and one LDO for the 3.3V?

Thanks
Lee

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