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