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Originally Posted by sanddrag
I'm just trying to envision how such a thing would even work. What would actuate the locking mechanism on the rollers?
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Simple. Add a slotted plate on the axle which turns with the omniwheel and normally lets the small sidewheels spin freely. Rotate the plate a few degrees relative to the hub and the edges of the slots touch the sidewheels, keeping them from spinning. I think a servo with appropriate leverage might have enough oomph to act as an effective brake; all you need is a rotating connection for three wires.
Or maybe I'm all wet -- I'm a programmer by training and inclination, so my mechanical ideas are sometimes rather, um,
loosely constrained by physical reality.