electronic wheelchair...codigo joystick twoo motors

programming code to: electronic wheelchair, with joystick control front, back, a left side, a right side. using two engines, and a joystick.
similar function, to caterpillar, thanks for your help

codigo de programacion para :silla de ruedas electronica,controlar con joystick delante, atras ,un lado izquierdo,un lado derecho. usando dos motores, y un joystick.
similar funcion, a oruga, gracias por su ayuda

You might want to expand on this a little bit.

Are you looking to implement a complete electric wheelchair control system? In other words, do you already have a wheelchair platform (custom dual motor controller, motors, batteries, frame, wheels, etc) - and you want to know how to implement code to control this system?

Or - do you have an existing wheelchair that you want to control - that is, it already has all the needed controls (ie - it's a working electric wheelchair you found somewhere) - and you want to interface to it and control it?

If it is the former - where you have all custom hardware (of some nature) - then that can be done (show us what code you already have in that case - along with schematics or whatnot of the devices being controlled and the controller, etc).

If it is the latter - where you have a manufactured wheelchair - then you'll probably not get too far with it - not without a lot of hacking and other reverse engineering. This is because such chairs are highly individual, as well as very proprietary in nature - they are also very safety conscious. If you don't feed them just the right signals with the right timing - they go into a "shutdown error mode" to prevent the chair from moving. They do this so that the user, who is typically disabled, won't be injured or hurt in any manner due to a malfunction of the chair or controls.

thanks for the help cr0sh
I have an electric chair broken joystick .
I remove her completely electronic system , built a power circuit generating PWM pulses using two potentiometers , I want to control the speed and direction with the joystick potentiometers x, y .
later gradually back , left and right , but gradually , not as caterpillar, have made ​​the electric circuit , MOSFET PWM controlled by potentiometers and speed, have implemented reversal system , delete the original circuit of the chair, I built a new one, I just need help with the code for using the joistick , control the movements of the wheels , similar to a toy car controlled joystick.disculpas I do not speak or write English , just use google traslator .

Roboteq controller?