Mecanum drive problems

[vhcook]

Originally Posted by cmcmaho

We are also having problems getting the mecanum drive to work. We are using the based Labview Holonimic VI. We are using a Logitech Extreme 3D Pro single joystick with X Y and Axis 3 Throttle. In reading this post we did confirm that we have it set to Mecanum - Cartesian.

Only two of the 4 wheels spin. We are using Talons. Does not seem to be an electrical issue and appears to be a code problem.

Please help
Thanks

I'm going to start with the easy question: Which two wheels are moving?

Are your PWM cables plugged into the same ports you specified in Begin.VI?

What color are the LEDs on your Talons when you try to drive forward?

[cmcmaho]

Hello and thank you for the quick reply
We worked on the bot some more this evening and detrimined that our CRio is the problem. We were getting only two wheels to run at any given time. We could switch around the pwm cables and get different wheels to run but only two at any given time. After a process if elimination we switched out the crio base unit and it worked.
We have two of the wheels on the left side going the wrong direction but we think we can correct this by switching the pwm settings around ?
Thanks very much

[Greg McKaskle]

That doesn't seem likely to be the problem. I suspect that the issue was resolved when you rewired or will show up again.

Do you have power plugged into the digital sidecar? Without power, the unit will often be able to drive a few speed controllers, but not four.

Greg McKaskle

[vhcook]

Originally Posted by cmcmaho

We have two of the wheels on the left side going the wrong direction but we think we can correct this by switching the pwm settings around ?
Thanks very much

The easiest way to fix this is to go into begin.vi and use the invert settings on the 4 Wheel Drive Open.

[cmcmaho]

Originally Posted by vhcook

The easiest way to fix this is to go into begin.vi and use the invert settings on the 4 Wheel Drive Open.

We seemed to have had our problem fixed, all 4 wheels ran after we tried another crio. But after I deployed the same program with minor changes to the non drive teliop system (adding some spikes), as soon as I enabled it it would run all wheels full speed for a second and then stop and I could not controll it. But if you enable it with the joystick moved ahead it will run however you want it to until you let go then it will lock up again. I uploaded three programms (one completely new one) and nothing worked. I think we had this problem last year. Any ideas?
Thanks!

[Alan Anderson]

Please tell us what the speed controller LEDs are doing when the problem occurs. Also describe the four green LEDs on the Digital Sidecar (three power indicators and the Robot Signal Light).

What you describe is vaguely consistent with the Digital Sidecar not receiving 12 volt power properly.