Programming Logitech Extreme 3D Pro

[Alan Anderson]

There is a function in LabVIEW called "In Range and Coerce". You can use the value of the throttle knob as the "maximum" input of the function, and use its negation as the "minimum" input if you want. The coerced output will follow the function's input, but will be limited to always be no lower than the minimum and no higher than the maximum.

[SuperS_5]

Originally Posted by Alan Anderson

There is a function in LabVIEW called "In Range and Coerce". You can use the value of the throttle knob as the "maximum" input of the function, and use its negation as the "minimum" input if you want. The coerced output will follow the function's input, but will be limited to always be no lower than the minimum and no higher than the maximum.

This will work, but well make a hard limit. The other solution post a few times makes a soft limit, applying the limit linearly across the whole a axis. There are reasons to use either. Your drivers may have an opinion on which way you pick.

[nickcvet89]

Thanks for the help so far, I was thinking would we be able to wire a potentiometer to a bread board and use that instead of trying to use a joystick for this function? If possible how would I program it to interact with the motor?

[SuperS_5]

Originally Posted by nickcvet89

Thanks for the help so far, I was thinking would we be able to wire a potentiometer to a bread board and use that instead of trying to use a joystick for this function? If possible how would I program it to interact with the motor?

I am not sure if you mean on the robot or driver station. If you meant the driver station, this wouldn't be very easy, and a joystick would make much more sense.
If on the robot, then it is a bit easier, but I still don't recommend it. It would add complexity to the robot wiring/programming, (depending upon how it would be used) weight, and not be adjustable during a match. Again, I suggest sticking to your original idea of a joystick axis. If you want something more difficult to modify while in use, you could always use a custom dashboard with a throttle slider on it.

[Alan Anderson]

Originally Posted by nickcvet89

Thanks for the help so far, I was thinking would we be able to wire a potentiometer to a bread board and use that instead of trying to use a joystick for this function? If possible how would I program it to interact with the motor?

The Cypress board will work for connecting a potentiometer to the Driver Station. In the simple "compatible" mode, you can read up to four analog inputs and use the returned value to govern your motor speed.

You don't even have to use a physical potentiometer if you don't want to. The Driver Station has an I/O tab that lets you set the value of a virtual analog input, which the robot can read as if it were a real analog value.

[SuperS_5]

Originally Posted by Alan Anderson

You don't even have to use a physical potentiometer if you don't want to. The Driver Station has an I/O tab that lets you set the value of a virtual analog input, which the robot can read as if it were a real analog value.

Thanks for mentioning this, I had completely forgotten about those.