Article
Capacitive Proximity Switch
Switching without wear
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.
Gerber file
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PCB
Component list
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
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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