Hi folks,

I am looking at using a PIC24FV32KA302 for a project that will include a=20
cheap solar/battery charger controller device. I will be powering the=20
controller board (my project) from the load output (assuming the battery=20
keeps it running when the sun goes down) and it will be using a 3.3v=20
voltage regulator (one of the Murata switchers) and I'd like to use a=20
couple of the ADC channels to measure the panel and battery voltages.

I have used the ADC to measure voltages in the past, using a voltage=20
divider to scale the voltage between Vss and Vdd but that has always=20
been when the measured voltage is referenced to the same ground as the=20
uC. In this case I don't know if the grounds will be common, and I am=20
wondering how I can measure these voltages.

So far I have come up with using an instrumentation amplifier, but I am=20
interested in alternative solutions.

Thanks for any ideas!
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.