I'm working on a project that needs to read a four-wire pressure sensor. The sensor takes 10 V DC in on two wires, and outputs 0-100 mV DC, 1 mV/psi. I need to read that voltage on an Arduino (actually a Teensy), convert it to a PSI measurement, light an LED if it's too low, and output the information over a serial line. I'm OK on the software side of it, at least conceptually, but questioning how to read the voltage.
My best guess here is that, to get decent resolution, I need to convert 0-100 mV to 0-5 V. My next guess is that I'd use an op-amp to do this. From there, my guesses are running out--I've not had occasion to play with op-amps before, and I'm not even sure that they'd be appropriate here. What would be the best (simplest, lowest parts count) way to accomplish this?