PID Loop Controller with a Servo

[jkelleyrtp]

Depending on the servo and controller (I might be completely wrong, I've only tested this on the arduino) you might run into an error where you receive no real feedback from the servo. Some arduino libraries will only report the last value you've sent to the servo, which makes testing for values useless. It might be worth your time to test this hypothesis out with the hardware you plan on using to make sure it truly reports its absolute location and not what the software thinks.