AD and PIC interfacing problem
Chris Fanning email (remove spam text)
In short, my application is to read AD from a pH electrode.
I'm using a 16F877 and I want to use all 8 AD channels. I have a 24V
power supply (24V used to control solenoids) dropped with a 5V
regulator for the PIC.
pH probes output roughly -500 to 500mV at very high impedance.
Some pH electrode and measurement info is at:
the bottom is the most relevant.
I think my biggest problem is the negative voltage reference, or lack
What's the best way of going from this electrode to the AD line on
See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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