Remote Control by Mobile Phone
Receive back: confirmation and GPS position data
Published in issue 383, November 2008
Remote control using mobile phones and SMS (Text Messaging) is in great demand but many systems on sale suffer from imperfections. The ingenious new design combines powerful capabilities with low technical overheads. It has programmable AC mains switching outlets plus status reports by text message and alarm-activated delivery of GPS data. The project featured in this article employs readily available mobile phones for the GSM receiver and data output function (at no cost at all if you use discarded handsets).
Resistors
R1,R3,R5,R7,R9,R11 = 1kohm5
R2,R4 = 10kohm
R6,R8,R10 = 1kohm
R12 = see text
R13,R14,R15 = 1Ohm/volt, 2W (see text)
Capacitors
C1 = 220µF 35V
C2, C11 = 100nF
C3 = 3µF3 50V
C4,C5,C6,C7,C8 = 1µF 16V
C9,C10 = 22pF
C12,C13,C14 = 0.1µF/ampère (see text)
Semiconductors
D1 = P6KE30A, TVS (30V / 600W)
D2, D3 = SB320 or 1N5820 (Schottky; 3A / 20V)
D4 = LED, red, low current, 3mm
D5 = LED, green, low current, 3mm
D6-D9 = LED, yellow, low current, 3mm
D10,D11,D12= 1N4148
T1,T2,T3 = BC337 (TO92 case)
IC1 = L78S05CV (TO220 case)
IC2 = MAX232CPE+ (DIP16 case)
IC3 = ATMEGA8-16PU, DIP28 case, programmed, Elektor SHOP # 080324-41
OC1 = PC817X2J000F, optocoupler, DIP4 case
Inductor
L1 = 40µH 2A (e.g. EPCOS)
Miscellaneous
X1 = 8-MHz quartz crystal (HC49 case)
RE1,RE2,RE3 = HRS4E-S (DC 5V)
K1 = DC adapter socket, PCB mounting
K2 = 2-way PCB screw terminal block, lead pitch 5mm
K3-K5 = 2-way pinheader, lead pitch 2.54mm
K6 = 9-way sub-D plug (male), PCB mount
K7 = 6-way mini-DIN socket, PCB mount
K8 = 6-way SIL pinheader, lead pitch 2.54mm
JP1,JP2,JP3 = 2-way SIL pinheader, lead pitch 2.54mm
S1 = MCRH2AF-10R 10-way DIP rotary encoder
S2 = MCDS02 2-way DIL switch
S3 = FSM4JH single-pole pushbutton, PCB mount
F1 = auto-resetting PTC fuse, 30V, sustain current 1.1A, activation current 2.2A, e.g. Multifuse MF-R110-0-99 (Bourns) or Polyfuse 30R110 (Littlefuse) or Polyswitch RUEF110 (Tyco), ES-LP30-110 (ESKA) = PFRA 110 (Reichelt.de)
P1-P8 = 1mm dia. solder pin
IC sockets for IC2 (DIL16), IC3 (DIL28), OC1 (DIL6 used as DIL4)
Heatsink for IC1 (U profile, 25x15x20 mm, 17K/W, slotted hole)
M3 screw, 10 mm, with nut (for securing heatsink)
Blue transparent enclosure, 150x80x50 mm (LxWxH), e.g. Conrad Electronics # 522498
PCB, Elektor Shop # 080324-1 or kit incl. PCB, # 080324-71
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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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