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Simple Capacitive Touch Sensor

Simple Capacitive Touch Sensor
Capacitive switches have clear advantages compared to other types of touch switches (for example 50 Hz or 60 Hz detection or resistance detection), but are often more complex to implement. Manufacturers such as Microchip have in the past designed specialist ICs for this purpose. However, it is still possible to design a reliable capacitive detector and/or switch using only a limited number of standard components.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1,R2,R6 = 10k
R3,R5 = 100k
R4 = 47k
C1,C2 = 470pF
C3,C4,C5 = 100nF
D1 = 1N4148
IC1 = 4093
IC2 = LM339D
K1,K2 = 2-way pinheader
PCB, ref. 080175-1 from www.thepcbshop.com
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