PID vs Normal loops

[3DWolf]

OK so maybe the while statement wouldn't work all too well, but couldn't you use an inverted scale type of thing, that the lower the error, the greater the modifier on it would be? I see the risk of that overshooting, but if it's balanced right I don't see why it should.
But then again, with the code I posted, it won't overshoot it, it will just reach it, VERY VERY VERY slowly. 128 speed isn't much, but then again your error is going to be such that much won't be needed.

[Dave Flowerday]

Originally Posted by 3DWolf

But then again, with the code I posted, it won't overshoot it, it will just reach it, VERY VERY VERY slowly. 128 speed isn't much, but then again your error is going to be such that much won't be needed.

I suggest you go ahead and try it out - you will likely learn a lot in the process. You will most likely find that it won't reach it. Remember, there is a deadband in the Victor speed controllers (sending them a 128 will not cause them to run at all) and with speeds that low the forces of friction in the system will be larger than the value you are sending to the motor.