Intelligent Clap Switch
Manuel remote control with extras
Published in issue 340, January 2005
A clap switch circuit is a classic beginner’s project. Equipment can
be switched on and off by just clapping your hands. Add a tiny microcontroller and you can easily build-in some more useful features.
The microcontroller in this circuit makes it a simple job to add some useful
features that are not seen on other clap switch designs:
– Changeover relay contacts enable the unit to be wired in conjunction
with a manual changeover switch so that manual override of the switched
equipment is always possible.
– The unit is only responsive to a specific sequence of sounds i.e., two
claps within a defined time window.
– A safety feature masks the input for a given time window if misuse
(repeated commands) is detected (useful if children have discovered how it works).
Resistors:
R1,R6,R7 = 4kOhm7
R2 = 150kOhm
R3 = 22kOhm
R4 = 10kOhm
R5 = 150Ohm
P1 = 100kOhm preset H
Capacitors:
C1 = 220µ F 25V radial
C2 = 100nF
C3 = 1µF 16V
Semiconductors:
B1 = B80C1500 (round case, 80V piv, 1.5A)
D1,D2 = 1N4148
D3 = bicolour LED (red/green)
IC1 = 78L05
IC2 = PIC12F629CP, programmed, order code 030166-41
T1,T2,T3 = BC238 or BC547
Miscellaneous:
JP1 = 2-way pinheader with jumper
K1 = 2-way PCB terminal block, lead pitch 7.5mm
K2 = 3- way PCB terminal block, lead pitch 7.5mm
MIC1 = 2-terminal electret microphone capsule
Re1 = bistable relay, 2 x changeover (e.g., Schrack RT314F12)
Tr1 = mains transformer 1 x 6V, min. 2VA, short-circuit proof (e.g., Marschner VN30.15/10522 or Era 030-7340.0T; Conrad Electronics # 506141)
PCB, order code 030166-1
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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