Sweat-Powered Sticker Turns Drinking Cup Into a Health Sensor

A team of engineers at the University of California San Diego has developed an electronic sticker that can monitor a person’s vitamin C levels using the sweat from their fingertips — no blood draws, lab visits, or batteries required. The flexible sticker, which attaches to the outside of a drinking cup, collects trace amounts of sweat as a person grips the cup. Within minutes, the system harvests enough power from the sweat to analyze it for vitamin C and wirelessly sends the results to a nearby laptop. The device was published in Biosensors and Bioelectronics.