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Joystick control for differential/skid steering

I'm trying to build a cart with differential steering (aka skid steering) which uses a joystick for all the controls.  Basically, a 4 wheeled cart with a motor at each rear wheel where the difference in speed between the two motors determines if the cart is going straight forward, backward, turning left or right, etc, etc. 

So, I am hoping you guys can tell me what to buy in order to get everything working?  I don't even know what kind of speed controller or mixer (?) I need to make the joystick work.  

Hopefully you guys sell it?  Any help is appreciated!!

We do not carry any joysticks or controllers for an application like that. A well-stocked online robotics supply store should have everything that you need though. 

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