> Hey, what do you guys think of this project?
>
> http://www.stefanv.com/electronics/battman2.html
>
> I've been looking to make or buy a computer controlled battery
> charger/discharger with voltage/temperature monitoring.
>

Too many parts for me. Voltage measurement is done with a discrete R2R ADC
using a counter instead of an SAR register. Lots of parts with
accumulating inaccuracy. A single SPI chip would be good if the ADC on a
chip is not sufficient.

Same on the current control. It's a build it yourself R2R DAC. I'd
probably use a PWM output of a PIC driving a FET and a fixed resistor as
the load. Adjust the duty cycle to set the average discharge current.

Harold


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