speed controller

i was trying to use a speed controller for my VEX so that i could control better, faster, continuous rotation DC motors to drive fans, wheels (bottle cap shooter) and the wieredset thing happened. im not sure if this belongs in this fourm but when i had both the speed controller and the VEX controller on and nothing worked exept for the VEX controller, but if i turned the VEX controller off i could control the Speed controled motor with the VEX remote but everything else dint work. and when i did it the other way, the speed controller wouldnt work but everything else did. i tried using only one battery instead of two and that didnt work does anyone know how i could fix this? its been bugging me. i think i need some kind if Diode becuase there must be some kind of interfering signal. if anone could help it would be great my bottle cap shooter is almost mobile and panable… full auto too… i just need to make the motor go…

What speed controller(s) are you using. It might help get an answer.

I’ve had a lot of luck using RoboteQ and SyRen speed controllers with my Vex setup.

Check out my blog for details and search on speed controller

http://www.artoo-detoo.net/tag/speed-controller/

Chris

Is that link broken?

Also how did you connect power to the vex controller, and to the speed controller?

the NERDS made a T shirt cannon robot that uses the vex controller, and the motors and speed controllers from the FRC “big” robot. The power comes from a 12v non-spillable lead-acid battery, with the FRC type fuse panel. There is an 8 volt regulator which powers the vex controller. This system works just fine. They’ve also used the same setup for an underwater robot (with the motors connected to the speed controllers by a long cable).

try this?

http://www.artoo-detoo.net/

Yes, this link works, Thanks.

sorry about that. i change the link to point straight at the speed controller posts

http://www.artoo-detoo.net/tag/speed-controller

I’m powering the Vex from my main 12v batteries via a power distribution board that steps it down to the the required voltage. The speed controller has two input voltages, first, the one that controls it’s electronics, and the second, the voltage that will be fed to the motors. In my case both are 12v and come directly off the 12v battery system.

I was asking Schematicsman how he’s doing it…

but thanks for explaining your system too, sounds like the systems I’ve seen.