Hi all, I'm pretty familiar with the digital side of things, but I've got a
(small, basic) analog problem to figure out, and was hoping someone could
help.

Basically, I need to interface a couple of sensors to a PIC with A/D. The
PIC and A/D side I can take care of, but these sensors are setup such that
they are a variable resistance to ground. For example, one of them is an
automotive pressure sensor with a 10-187 ohm resistance to ground, and I
would like to convert that to a variable voltage. Oh, and most of the
sensors are linear.

I was thinking about trying to use the sensor as part of a voltage divider
and 2 op amps to offset and amplify the voltage to a 0-5V range, then I
could simply handle the unit conversion in software. This would be the
correct way to do it, right?

I was trying to find a simpler way of interfacing these sensors because I
will have several of them, each with different resistance ranges, so trying
to setup and calibrate the resistance values for each one seems like a big
pain.

Should I just shut up and start trying to setup the op amps for each of
these sensors, or is there an easier way? Maybe someway to utilize the fact
that they are resistance to ground?

Any help or pointers to information is greatly appreciated.

Aaron

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