Thread: 4x4 software differential
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Unread 24-06-2002, 00:20
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Re: 4x4 software differential
Posted by nick reynolds.

Engineer on team #237, sie h2o bots, from watertown high ct.

Posted on 11/4/2000 10:14 PM MST


In Reply to: 4x4 software differential posted by James on 11/4/2000 1:27 PM MST:



James. You dont say how many motors you are using but assuming your using three ' 2 for driving and 1 for steering ' then it should be fairly easy.
One motor drives the right side, one the left side. The left wheels are connected by a chain or a thin 'V' belt so they run at the same speed. The right the same.
If you turn left then the right motors drive faster than the inside ones as the joy stick is moved in that direction, and vice versa. the third motor is reserved to help steer by rotation of the four wheels in unison.
One of the buttons on the joy stick could be used to operate the third motor for over steering or side ways driving?
The tricky part is to have the wheels turn while they are being steered at the same time but it can be done simply.
Soft ware should not be to much of the equation.
nick 237.


: I am trying to come up with a single joystick operated 4x4 base that the front wheels are steerable. I have tried tank style single joysitck and doesn't work well. So I need software 'differential.' Both motors going in the same direction, but at different speeds while turning proportional to the radius of the turn. The tighter the turn, the slower(to a point) the inside motor spins. Any thoughts?
: James Rallo


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