Hi Everyone,
I am attempting to build a smart battery charger for
NiMH batteries (8-AA), with a F877. I am going to
use PWM to control a LM317, and sample the voltage
with the ADC to look for the delta V.
I was planning on: (I got these from Panasonic)
trickle charge .05C which would be 5% duty cycle
Soft charge    .20C which would be 20% duty cycle
fast charge    .75C which would be 75% duty cycle
I have a couple questions:
1.) What frequency should the PWM be ?
2.) Anybody know a simple circuit to control the
LM317 with the PWM PIC pin ?
3.) How often should I use the ADC to look for the
delta V to turn off or switch to trickle charge ?
Any help would be appreciated.

Thanks,
        Kevin
PS. I am a programmer not an EE, if you couldn't tell from above :)

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