Victor Kremin and Ruslan Bachunskiy
Cypress Semiconductor

Capacitance sensing systems can be used in applications that are exposed to rain or water. Such applications include automotive applications, outdoor equipment, ATMs, public access systems, portable devices such as cell phones, PDAs, and kitchen and bathroom applications. This Application Note discusses using capacitance sensing on systems that must continue operating under moisture, rain or water drops. The proposed technique prevents false touch detection even when the sense area is covered completely with water.