PIDs out of control

[wildaburk3160]

From what we've gathered, the PotentiometerGetNormalized.vi gets the voltage reading from the potentiometer and returns it as some sort of proportion of the total possible voltage. It seems that 90 degrees ~ .1 change in the returned value.

So, if we were to set our "midpoint" at the middle of the pots rotational range, we would set our setpoint to .50. Our goal then is to rotate at maximum 90 degrees in either direction from this point. Theoretically, this should change the value by .1, but it has a small variation, so we have it set to where we manually control the "maximum" and "minimum" values of the pot.

None of these values we have set come up near the extreme values of rotation, which would either be "0" or "1".

We haven't thrown in any limitations to rotations in the program other than how far we can change the setpoint, but I will soon implement something.

[Ether]

Originally Posted by wildaburk3160

the PotentiometerGetNormalized.vi gets the voltage reading from the potentiometer and returns it as some sort of proportion of the total possible voltage

As I said, I am not familiar with PotentiometerGetNormalized... but for a 5-turn pot, 1/4 of a turn (90 degrees) would be (1/4)/5 = 0.05 of the total range.

[wildaburk3160]

Well, regardless of it's particular function, do you have any other ideas as to why this problem is occuring?

[Ether]

Originally Posted by wildaburk3160

Well, regardless of it's particular function, do you have any other ideas as to why this problem is occuring?

It's either hardware or software. Here's a good way to find out if it's software:

Originally Posted by Ether

I suggest you post your code for review.

[GeeTwo]

Originally Posted by Ether

It's either hardware or software. Here's a good way to find out if it's software:

And to help figure out if it's hardware, it would help if we understood just what hardware you're using, how it's connected, and how it's supposed to work. Including links to spec sheets would also be helpful!