Capacitive keyboards

We develop, produce and sell input systems based on a capacitive active principle under the incorporated trade mark CapiSwitch®, CapiSense®, CapiTakt® (CapiTact®) and CapiTop®.

Capacitiv keyboard
  • no movable wear parts, so no mechanical abrasion of the contacts and consequently an extremely high duration of life
  • excellent cleanability of the closed operating interface, which is normally
    made of glass, plastic or other nonconductive materials
  • very good resistance against chemicals and cleaning supplies
  • high mechanical strain possible
  • high design freedom because multicoloured printing on the back possible
  • only very low up to no operating force necessary at data input
    (similar characteristics like sensor)
  • support of the feed back through audible, tactile and/or optical signals possible
  • apart from punctual buttons, locators can also
    be integrated in the form of slide- and wheel controllers

The sensor surface of the switch-key consists of one or more electrical conductive areas, which feature a solid but unkown capacity to the earth potential or to each other. The unkown capacity is compared with a reference capacitor, whose capacity is known. It creates a counter value, which stands for a basis value for the not active sensor.
If a conductive object, for example a finger, touches the dieelectrical field of the sensor, the capacity changes. This effects that by the reference capacitor a changed counter value is calculated.
Depending on the adjustable hysteresis value (selector shaft) the evaluation electronics establishe the “pushing” and also disengaging of the sensor.
Special filter technologies and algorithms abort faults effectively, which can result from negative environmental influences like wetness and temperature.

  • CapiSense®: capacitive active principle of the input systems with integration of wheel and slider
  • CapiTakt®/CapiTact®: capacitive active principle of the input systems with tactile feedback at activity of the keypad
    (for example vibration through electrical impulse)
  • CapiSwitch®: capacitive active principle of the input systems with additional switch
  • CapiTop®: capacitive active principle of the input systems in combination with further input technologies (for example short stroke keyboard)

CapiSwitch®-prototype for demonstration of the capacitive technologies in the keyboard areas:


  • integrated slider
  • integrated wheel
  • 7 single buttons  (incl. company logo)
  • touch surface by LEDs lighted from the back
  • The touch condition of the sensors is signalized optically through the change of the backlights. The lighting duration and intensity (per PWM) can be adjusted individually for each LED or button. The direction of rotation at the wheel and the up and down movement of the slider are also shown through illuminated fields.
  • The analysis of the position of slider and wheel is effected through a TWI-serial interface.
  • The buttons can be evaluated over the TWI-serial interface or assigned directly over the LED-outlet to the further electronic. In case of corresponding upstream protective circuit a directive control of a relay or an optical coupler is possible without the customer needing an additional controller for the TWI-communication.
  • The responsivity can be triggered separately for each sensor. Therefore an adjustment to different material thickness of the front control panel is possible (up to 4 mm acryl glass or 7 mm real glass). The first break of the sensors is adapted dynamically to the environmental conditions, so that even with contaminations of the front control panel the operation of the sensors is possible. In addition to that, a maximal activation time can be defined. If the finger persists longer on the sensor, this one is falling automatically back and can be activated again only after dissolving of the finger
  • According to the requirement, the sensors can be fixed on the circuit board of the evaluation unit or mounted flexibly as membrane circuits
  • The aluminium enclosure is based on the standard profile Alu-Optima of our program
  • Article number: GHS-DEMO.0001
    This is just a sample to show the different type-in technologies. It is not for sale, but of course we develop a system due to your wishes and requirements.

    Please do not hesitate to ask us


Capacitive single pushbutton:

More information about capacitive single pushbutto CAPW01, that works on the capacitive principle of action and behind each electrically non-conductive surface (for example glass, acrylic glass, wood, plastic) can be glued,
can you find here ->

Capacitive single pushbutton

Capacitive input system:

More information about the capacitive input system CAPOSD,
where you can configure as desired up to six sensor surfaces
can you find here ->

CAPOSD - capacitive input system

Standard controller with capacitive sensor foil

This standard controller could be used to evaluate any customized capacitive
sensor foils. It is able to evaluate 16 buttons or a 4 channel slider and 12
buttons or one wheel and 10 buttons.  Optional easy to cut a sensor foil
with 1 - 16 keys available. More information you can find here ->

Standard controller with capacitive sensor foil

Glass processing by Wöhr

We realize your (glass)-input system in any form and function
and optics.

Our possibilities and our offer in this field include almost all about optical and technical glass processing.

Be inspired by ->


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