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Try looking for "third thumb". A DIY project where a guy got input from a toe to control a motorized second "thumb" on a hand. AFAIK no one ever made a project of it ... but ones feet are a vastly under utilized resource and could be re purposed quite readily. Eg why not control a virtual twiddler? Or indeed a "hand prosthetic".

I think a foot interface would be awesome for bulk operations like scrolling/panning/zooming. Think of a trackball but like a medicine ball that is heavy and carries some momentum. Pedals too i guess, but i like the big heavy ball idea. Probably be great for your feet too.

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