01
The control
How a movement a person already has becomes a hand that follows. How it differs from EMG, and what remains to be tested.
The history
The first hand, and the one we build now
The line below reads from the bottom. It starts with the hand that was built, and it ends at the top, with the work of today.
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2026 · now
A new version of the prototype
We are building the new version of the prototype. The app and the kit are the work of this year. The control already runs in the app, where a person can explore opening, closing, and grip selection.
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Working
The control
The control logic runs, and the app lets a person explore opening, closing, and grip selection.
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Working
The app
Built, and it runs with no kit. It is free, and the App Store listing opens with the release.
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In development
The kit
The contact fork design is recorded. Physical fit and the complete assembly still need testing.
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In development
The hand
Work continues on the mechanics the control moves. It is not for sale yet.
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Working
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Before 2026
The first hand was built, and it held a grip
An earlier hand was designed, built, and tested. It ran on video, and it held four grips: pinch, point, forceps, and fist.
The mechanics used cheap motors, and the design of the mechanics was weak. The concept held. The build did not, and that is the reason for the new version.
02
The Deterica Kit
A kit designed to read residual-limb rotation through a contact fork, and a free app with a virtual hand. Both have separate release dates.
03
Why this exists
It began with my father. What I found in the market, and why I set out to build the thing I could not buy.