Product name:  Capacitive membrane keyboard

Range of Application

Capacitive touch-sensitive switches have the advantages of wearproof, temperature and humidity resistance, waterproof protection and low cost. It's widely used in mobile phones, VCD, DVD, car buttons, induction cooker, range hood, water heater, washing machine, microwave oven, MP3, MP4, DPF digital photo frame and CAR DVD, etc.

Working Principle,

The basic principle of the capacitive touch sensing button is shown in the figure. When the human body touches the electrode, a capacitor CF is formed between the sensing electrode and the large area, the inductive capacitance usually has a few pf up to tens of pf, because the human body is equivalent to a capacitor connected to the ground. Using this most basic principle, building related circuits external can detect whether there is a human body touching the electrode according to the change in the capacitance.