We geared our robot for speed…maybe to much. We need to slow the response of our joysticks to the drive motors to keep us from spinning out. We are using talons and labview. Any help?
Here’s a simple option that might work well for you: in the wire between the joystick axis and the Robot Drive function, insert a cube function.
Right-click the wire. From the popup menu, choose Insert -> Numeric Palette -> Expression Node (it’s a rectangle saying EXPR). You’ll get a small orange box with right-pointing arrows on either end. Click the blank space between the arrows and type xxx.
Now, small motions of the joystick will give you very small changes in the motor control value. Medium motions of the joystick will give you smallish changes in the motor value. But full travel of the joystick will still give you full power.
You could modify the response curve of your joystick to emphasize the low end more
Like this:
Or your could cut the top speed by multiplying the joystick axis by a percentage, like .75, before feeding it to the Motor Output.
“Spinning out” and “need to slow the response” sounds like you geared your drivetrain for too much acceleration.
If that’s the case, take a look at the “slew rate limiting” in Eric VanWyk’s article here: http://thinktank.wpi.edu/article/140
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