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Capacitive Pressure Sensing Based Key in PCB Technology for Industrial Applications

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4 Author(s)
Vracar, L. ; Fac. of Electron. Eng., Univ. of Nis, Nis, Serbia ; Prijic, A. ; Vuckovic, D. ; Prijic, Z.

This paper reports the design and manufacturing of a device suitable for use in command panels of industrial equipment in the place of mechanical buttons and switches. The device consists of a capacitive pressure sensor, low-cost microcontroller, current driver, and state indication LEDs. All components are embedded into multilayer printed circuit board using standard manufacturing steps. The device has user-programmable properties and it can behave either as a key or as a switch. An interconnection feature is provided in a sense that multiple devices can be organized into an array thus forming a keyboard. A simple two-wire communication interface for controlling the keyboard is described.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 5 )

Date of Publication:

May 2012

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