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Re: What is PID?
Oh, I forgot to mention:
The "loop" part refers to the fact that PID is a form of closed-loop control... there is a feedback loop. You are "looping" the output from the "plant" (explained in a moment) back into the controller (PID).
The "plant" is the device your PID is controlling, in the example I gave it is the drivetrain (motor+gearbox+wheel etc). The "output" of the plant is the wheel speed. The wheel speed signal is "looped back" to the PID.
Questions? Fire away...
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