One-key Keyboard

This research introduces the One-key Keyboard, a wearable text entry solution designed to resolve the inherent trade-off between wearability and usability. Traditional wearable keyboards often sacrifice input performance by drastically reducing the number of keys, leading to increased Keystrokes per Character (KSPC) and steep learning curves. In contrast, this project employs a novel minimization strategy by reducing key pitch rather than the key count. The system features a single physical input area (70mm x 35mm) printed with a full 10x5 QWERTY layout, utilizing fingertip position sensing to identify specific character inputs during keying events. Empirical evaluations through multi-session performance tests demonstrate that users can achieve significant typing speeds, reaching up to 24.5 WPM with manageable error rates. By maintaining a familiar layout within a highly compact form factor, this work offers a compelling balance of social acceptance, input efficiency, and learnability for the next generation of wearable computing environments.