Pressure Text Entry for Mobile Devices
David McCallum, Edward Mak, Pourang Irani, Sriram Subramanian · 2008
The PressureText Device • Has 12 force sensitive buttons • Buttons can detect 1024 distinct levels of force • Detects forces between 0 and 1.5 N • Push lightly to get the first letter on a key, and harder to get each successive letter • Release slowly to move to the previous letter • Release quickly to type the current letter MultiTap • Lets users cycle through the letters on each key by pressing it multiple times • Is commonly seen on mobile devices, especially cell phones • Allows typing with fewer buttons, but the speed is significantly slower than a standard keyboard layout