With this smart switch you can turn mains-powered devices on and off easily and conveniently. Applications such as TVs, radios, basement and outside lights and the like come to mind. Thanks to various sensor options this can also be done automatically or with a delay. In addition, this circuit also helps to save energy.
Resistors
R1-R4 = 100kOhm (SMD 1206)
R5 = 100kOhm (SMD 0805)
R6,R9 = 22kOhm (SMD 0805)
R7 = 100Ohm (through-hole)
R8 = 1kOhm (SMD 0805)
Inductors
L1 = 47µH, e.g. Panasonic ELJFA470JF (1210 suppressor coil, min. 80mA)
Capacitors
C1,C6,C9,C10 = 100nF (SMD 0805)
C2,C5 = 10n (SMD 0805)
C3,C4 = 220nF 275VAC X2
C7 = 100µF 35V radial
C8 = 10µF 35V radial
Semiconductors
D1-D8 = TS4148
D9 = 24V 1.5W zener diode
D10 = LED 0805
T1 = MMBF170
IC1 = PIC10F206T-I/OT
IC2 = L78L05ABD
Miscellaneous
Re1 = 24VDC relay, SPST, Multicomp type HRS4-S DC24V
K1 = 5-way SIL pinheader
K2 = 3-way PCB screw terminal block, lead pitch 7.5mm
With the Twilight and IR switch, components R2, R4, C4, D5 and D7 are omitted
Twilight switch
R10 = LDR FW200, Conrad Electronics # 183580
R11 = 1k
P1 = 250k
C11 = 10µF 63V
C12 = 100nF
IR switch
IC3 = IR switch, TSOP1738
C13 = 100nF
Countdown switch (R1,R3 and C3 omitted)
S1 = pushbutton, 1 make contact (see text)
R12,R13 = 5kOhm6 1W
Informative articles
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