Capacitive keyboards

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A fully functional, plug-and-play capacitive keyboard consists of a printed circuit board equipped with capacitive sensors and the evaluation electronics. The elements are connected with conductive tracks. The capacitive sensors simulate the individual keys. The entire keyboard layout is thus represented by the number and arrangement of the sensors. After connecting the keyboard to a computer, the sensors generate a capacitive field. If the finger changes this field, the capacitance inevitably changes. This change is the grand position to generate and trigger a signal which is sent to the evaluation electronics.

The printed circuit board is covered by a decorative foil, which is graphically designed with user elements. The design can be largely freely determined by the customer. The top element of the structure is the actual user interface, which can be made of any non-conductive material. In practice, glass and plexiglass are mostly chosen. The thickness of the material can range up to 10mm.

Possible further operating effects are the partial engraving of the surface material or the backlighting by LED in different colours.

Manufacturer: Gett

Documents

• Datasheet