Skin patch lets users type and read messages through touch

Researchers have developed a soft, skin-like patch that enables users to type and receive text messages through touch, leveraging advances in stretchable electronics, gel-based sensors, and AI. Unlike conventional digital devices that detect only simple taps and swipes, this patch uses an iontronic sensor array embedded in a flexible, stretchable copper circuit layered with silicone to detect subtle pressure changes on the skin. The patch encodes ASCII characters by dividing each character into four two-bit segments, with each sensor registering presses that correspond to segment values. Feedback is provided via vibration patterns, where actuators vibrate a specific number of times to represent each segment, creating a tactile communication system aligned with the ASCII standard. To interpret touch inputs without requiring extensive data collection, the researchers developed a mathematical model simulating pressing behavior, capturing variations in force, duration, and press count. Demonstrations of the patch include typing the phrase “Go!” with tactile confirmation and controlling a racing game where presses steer the vehicle and vibration intensity indicates proximity