P.I.D. Control for the arm

[skibum2490]

Hey guys I have a quick question I would like to ask.

We're using a linear potentionmeter to give us an analog value so we can set the arm position (high, mid, low) based on the flick of a switch. However, we're using P.I.D. control in order to get to where we need to be.

Now, the problem we have is the large amount of oscillation occuring after the switch is pressed, ex. the arm jumps way past the position, then comes back and hits the ground before re-adjusting to the right height. Our motor is geared down 21:1 which we're hoping to increase to 64:1. Basically, what is the best way to eliminate oscillations through P.I.D. control?

Thanks!