A->D converter?

[VanWEric]

I know this is a little bit off topic, but heregoes:

I am attempting to write a program (in C++ hopefully, but i also know PBASIC, and can learn others) that will sample a voltage coming in from a displacement sensor and use that information to tell a motor how far to push. In other words, i need it to push a little bit for a small displacement and a lotta bit for a big displacement. To find out how far i need to push i am going to have it pass/fail its own attempts by seeing how far the sensor is now pushed, and do a regression on it to make it "learn". What i need now is a way to get a powerful enough processor to do the math, and the ability to read the data. BTW - the voltages are approx -10 to 10volts

THanks