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Capacitive Proximity Switch

Switching without wear

Capacitive Proximity Switch
People building their own self-balancing electric scooters face the problem of determining unconditionally whether the rider is standing on the platform or not. Mechanical solutions have not provided convincing answers. A purely electronic ‘rider detector’ exists already in the form of a capacitive proximity switch. Naturally this can also be adapted for other potential applications.
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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.

COMPONENT LIST
Resistors
(SMD 1206)
R1 = 1.5kOhm
R2,R3,R4 = 120Ohm
Capacitors
(SMD 1206, ceramic)
C1 = 100nF 25V
C2,C3 = 1µF 16V
C4 = 4.7µF 10V
Semiconductors
D1,D3 = BAT42W, Schottky, SOD-123
D2 = LED, red, 1206
IC1 = ATtiny25, SOIC-8, programmed, Elektor # 120505-41
IC2 = MCP1703-5, SOT-223
T1 = BSS138, SOT-23
Miscellaneous
K4 = 6-pin SMD pinheader (2x3), 0.1‘‘ pitch
PCB # 120505-1
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