How do you get Tank Drive working?

[Mark McLeod]

I'll assume you know the basics of LabVIEW programming - how to wire, how to get around the palettes.
You need to do two things:

1. Add another joystick for tank drive
2. Switch Arcade Drive to Tank Drive

First open/close the joystick:

• In Begin.vi copy the creation of Joystick 1 and paste it.
• Change the new joystick open to another USB port
• Give the new joystick a descriptive new name. e.g., "joystick 2"
• Wire the error output to the little Build Array box. It can be expanded to expose a new node for wiring.

• In Finish.vi copy the code for joystick 1 and paste it.
• Change the name to "joystick 2"

Next switch to Tank Drive:

• In Teleop.vi, in the inner case statement box select the False case.
• Remove the axis 1 (x) wire leading to the Arcade Drive
• Right-click on Arcade Drive, select Replace -> RobotDrive Palette -> Tank Drive
• Copy the Joystick Get and the unbundled axis box and paste it.
• Wire the new axis 2 (y) to the Left Axis Value node on Tank Drive
• Now the new joystick should be added to the Joystick Read vi if you wanted to maintain the style used here, but I'm going to fall back to a simple approach and just have you add it to the left side of the block diagram.
• Add a Joystick RefNum Registry Get.vi (the one that looks like the # Drive icon) on the far left.
• Add a constant to the "refnum name" input node and give it the name of your second joystick
• Wire the output JoystickDevRef through the two case statements to the Joystick Get you added.