Encoder programming help needed.

[burde1jb]

Hey CD! So our lead programmer graduated and his understudy moved back to Germany...

So working on a summer bot left us with very little LabView know-how. I'm coming to you as I have exhausted other sources and I will lay them out as we go.

Here's what we would like to do. We have the AndyMark Hall Effect Encoder on the back of a PG71 with RS775 motor attached. This is then attached to a 16 tooth gear which runs an 84 tooth gear (5.25:1 gear reduction). That 84 tooth gear spins our turret on our t-shirt cannon robot. Yes, this is basically our version of Shockwave. Mad props to Team 254.

Okay, we would like to use the encoder to enable us to push a button, have the motor spin just enough to move to the next barrel to help us get to the next shot. So the disc is 14 inches in diameter. There are 10 barrels all together, so we want the disc to move 14 * pi / 10 inches.

I've attached pictures of our Begin.VI and Teleop.VI

When this code was deployed, the motor would only spin on holding the button down and would not stop when it got to the next barrel. In fact, when the button was suppressed, the turret just kept spinning until we let go of the button. We checked the PWMs to be sure we were not mixing up which button did what.

So here is what we modeled the code and our work after:
Wiring
Block Diagram
Other sources

TL;DR Want a 14 in diameter plate to be moved 1/10th of the way on the press of a button. 84:16 and 71:1 gear reduction with 7 pulses per revolution. Robot runs motor while holding down button and does not stop until we let go of the button.

I'm thinking we did something wrong with the DistancePerCount in Begin.VI or Distance in the Teleop.VI. I'm just not sure where we went wrong.

Any help would be appreciated. Many thanks from Team 4327. Please take a look.