New Voice-Controlled Bionic Hand Does What You Say

If you’ve ever seen a prosthetic hand, you know they can be complicated and expensive. A team at Indira Gandhi Delhi Technical University for Women has designed a simpler version that listens to your voice. The hand uses a “tendon-driven” system, which means thin strings act like the tendons in your body, pulling fingers closed when tiny motors tighten them. A small computer chip called an Arduino controls the motors, and a Bluetooth receiver lets you send voice commands from your phone.

The hand can perform four basic gestures: open hand, fist, pinch, and half-flexion. Just say “make a fist,” and the motors tug the strings in the right order. In tests, it took about 7-8 seconds to curl all fingers fully. That’s slower than a natural hand, but the motion was steady and repeated many times without losing tension or precision. It could also grab objects of different shapes and sizes, like a cup or a ball, without dropping them.

The biggest advantage is simplicity. Many advanced bionic hands use complex sensors and machine learning, which drives up cost. This design uses off-the-shelf parts and a basic programming board. That means it could be built cheaply and maintained easily, making hand assistance more accessible in developing countries where expensive prosthetics aren’t an option.

Of course, there are limits. The hand only follows pre-programmed voice commands—it can’t learn new grips on its own. And the 7-8 second response is too slow for fine, quick tasks like typing. Still, for everyday actions like holding a bag or shaking hands, it’s a promising step. The researchers plan to submit the paper to a journal, and next steps likely include speeding up the motors and adding more gestures.