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Thread: AD and PIC interfacing problem
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face BY : 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:
  http://www.innovativesensors.com/phMeasure.asp
the bottom is the most relevant.

I think my biggest problem is the negative voltage reference, or lack
thereof.

What's the best way of going from this electrode to the AD line on
a PIC?

Ideas?

Thanks,
Chris

<199910190048.UAA98810@jingoro.prevmed.sunysb.edu> 7bit

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