Article

SMS-Controlled Mains Sockets

remote appliance control by GSM phone

Using a simple SMS message sent from your GSM phone, two mains powered loads may to be switched on and off independently, or programmed to do so at a specified time.Remote control by telephone and other telecommunication systems like transmitters/receivers are no new subjects to Elektor Electronics readers. Over a decade ago, we already published the design of a switching unit with seven outputs under the control of DTMF signals sent over the telephone network. Related items in the Elektor projects archive include a Personal Mini Web Server (September & October 2001) and the 535 ‘Lite Board which was capable of initiating control actions using SMS.

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Materials

020157-PCB.pdf

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Download Gerber file: 020157-1.zip

Component list

Resistors:
R1,R7,R8 = 150?
R2 = 1k?
R3,R4 = 1k?2
R5,R6 = 56?
Capacitors:
C1,C2,C8 = 100nF
C3-C7 = 1µF 16V radial
C9 = 100µF 16V radial
C10 = 220µF 25V radial
Semiconductors:
B1 = B80C1500 bridge rectifier in round case (80V piv, 1.5A peak)
D1 = LED, 3mm, yellow, low current
D2,D3 = 1N4148
D4,D5 = LED, 3mm, red, low current
IC1 = 78S05 (do not use 7805)
IC2 = MAX232
T1..T3 = BC 547B
T4,T5 = BD139
Miscellaneous:
Tr1 = mains transformer, 9 V / 3.6VA, short circuit resistant, e.g. Gerth # 387.09
Re1,Re2 = relay, 1 c/o contact, PCB mount, coil voltage 6V, contact rating 250V / 4A (Siemens V23057 B0001-A101)
K1,K2,K3 = 2-way PCB terminal block, lead pitch 7.5mm
K4 = 9-way sub-D socket, PCB mount, angled pins
K5 = 50-way PCB connector, straight, female, lead pitch 0.05” (Farnell # 672-348)
IEC mains appliance socket with fuse (15mA slow) and mains on/off switch
GSM Modem = WMOi3 (manufacturer: Wavecom; distributor: Unitronic)
GSM antenna with MMCX connector
2 mains sockets, panel mount, to BS1363
PCB, order code 020157-1
Suggested suppliers:
GSM modem
Unitronic AG, Mündelheimer Weg 9, D-40472 Düsseldorf, Germany.
Tel. (+49) 211 9511-0, fax. (+49) 211 9511-111
mail : info@unitronic.de, Website : www.unitronic.de
GSM antenna
IMS Connectors Systems GmbH, Obere Hauptstrasse 30, D-79840, Löfflingen, Germany.
Tel. (+49) 76 5490 10, fax (+49) 76 5490 1199.
Email: sales@imscs.com, Website: www.imscs.com