I'd start by looking at the external chip options, even if you don't use
one those parts, thier data sheets should be a wealth of information about
the proccess
-Denny


> I would like to use a couple of spare PIC pins to pulse charge a 3.6v
NiCad
> battery (aka ). I assume this can be done by using three PIC pins:
>
> * Pin A: detect if external power is applied (ie stop draining the
battery
> and start charging it, if necessary)
> * Pin B: send the PWM pulses to the NiCad to charge it
> * Pin C: read the battery voltage to see if it is charged
>
> Pin A & C are obviously straight forward. Pin B is the bit that's new to
> me. I am not sure how simple/elaborate to make the charging circuit. I
> specifically don't want to use an external NiCad charging chips - I don't
> see the point (nor want to go to the expense) since there is already a
PIC
> in the circuit capable of doing the work.
>
> I haven't been able to find any circuits or mentions in the PicList
> FAQ/archives or on the web of this being done? Has anyone done it
> sucessfully? Details?
>
> John
>
>
> _______________________________________________________________________
> John Brown                         Email: john.brown@anu.edu.au
> Mobile: 0429 455 504                 Web: www.netspace.net.au/~jabrown/
>
> I don't want to sound paranoid but I think I'm following myself around.
> Everywhere I go, there I am! Sometimes I think it's going to drive me
> around the bend, but at least I know I'll have company when I get there.
>
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