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SMS-Controlled Mains Sockets

remote appliance control by GSM phone

SMS-Controlled Mains Sockets
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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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R7,R8 = 150?
R2 = 1k?
R3,R4 = 1k?2
R5,R6 = 56?
C1,C2,C8 = 100nF
C3-C7 = 1µF 16V radial
C9 = 100µF 16V radial
C10 = 220µF 25V radial
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
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
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