On 7/16/2013 11:59 PM, lee@baudalign.com wrote:
> I'm making a li-ion (18650 battery) powered board with mostly 3.3V PIC an=
d
> devices on board, with a 3.3V buck-boost, but I realised in my last
> version that I'd left out any sort of battery monitoring.  I don't
> actually need/want much, I don't necessarily need to read the
> voltage/current all the time, just need some way of noticing the battery
> is getting low and setting a flag in the PIC to display a "charge battery=
"
> indicator?
>

A diode or two on the 18650 battery to drop it to 3.1V connected to a=20
10k resistor in series  on the ADC channel should do the job.
Mark

--=20
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