The Wristband That Knows What Your Fingers Are Doing
Smartwatches and fitness trackers are commonly found on people's wrists these days, which makes them a convenient platform for monitoring things like heart rate, activity levels, and sleep patterns. But one thing they can't tell you without additional sensors is what you're doing with your fingers. That capability is important for many applications, ranging from tracking athletic performance to controlling other devices, so William van den Bogert designed and built a custom bracelet that can recognize hand gestures by monitoring the movement of muscles and tendons beneath the skin.
The bracelet relies on a technique called force myography (FMG), which uses pressure sensors to detect changes in the shape of muscles and tendons as they move. When you make a fist, pinch your fingers together, or perform another gesture, the muscles and tendons in your forearm contract and shift in characteristic ways. Those movements cause subtle changes in pressure around...
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