> Voltage sensing  (by a resistor divider and a little low pass filter,
maybe)

For the particular NiMH battery packs that have been going around lately,
the 5V PIC A/D range is just about right.  I connected the battery directly
to the PIC A/D input and did the low pass filtering in software.  There are
plenty of cycles in this app since things happen in seconds or minutes, not
milliseconds.  In the final charger I have to worry about what happens when
the PIC power is off but the battery is still connected.  The battery would
try to power up the circuit thru the PIC protection diode.  Obviously the
final charger circuit is going to require some thought.

> Battery temperature sensing vs. ambient (by a simple 2 thermistor divider)

I'm hoping to get away without having to sense temperature, but that may not
be possible.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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