Motorcycle Theft Alarm
with dual sensors, tamper protection and remote control
Published in issue 314, October 2002
This alarm system uses two PIC16F84 processors and is relatively easy to build and install. The cost is very low compared to ready-made systems, while its effectiveness leaves nothing to be desired!Recently we have seen in the media that there has been a substantial increase in the number of motorcycle and scooter thefts. Large gangs operate together and steal certain makes on order. High up on the list of these criminals are the exclusive models of Ducati and Harley-Davidson, but the more expensive BMWs are also targeted, as is the £20,000 Honda Goldwing. Mind you, it’s not the case that owners of less expensive machines are immune from theft, since many are stolen in that category as well. It is a sad state of affairs, but nevertheless true.
Transmitter
Capacitors:
C1 = 100nF
Semiconductors:
D1 = IR LED, e.g., CQW13 (Conrad Electronics # 184551-89)
IC1 = PIC16F84-04/SO, programmed, order code 000191-41
Miscellaneous:
JP1 = 2-way pinheader with jumper
K1 = 5-way pinheader
S1 = miniature pushbutton
X1 = 3-pin 4-MHz ceramic
resonator
BT1,BT2 = 1.5V button cell with PCB mount holder 16×1.6 mm (e.g., CR1616)
Enclosure: Teko 11121 (Conrad Electronics # 543287)
PCB: see under ‘alarm’
COMPONENTS LIST
Alarm
Resistors:
R1 = 47kΩ
R2 = LDR
R4,R4 = 10kΩ
R5 = 220kΩ
R6 = 4kΩ7
R7 = 1kΩ
P1,P2 = 10kΩ
Capacitors:
C1,C2,C3,C5,C6 = 100nF
C4 = 100µF 16V radial
Semiconductors:
D1 = 1N4001
D2,D3 = 1N4148
T1 = BC547
T2 = BUK101
IC1 = LM393
IC2 = 78L05
IC3 = PIC16F84-04/P, programmed, order code 000191-42
IC4 = SFH5110-36
Miscellaneous:
K1,K2,K3 = 2-way PCB terminal block, lead pitch 5mm
RE1 = 12V relay, 2 make contacts, 8A, (e.g., Schrack RT424012)
S1,S2 = mercury tilt switch (Conrad Electronics # 700452)
BZ1 = 12V siren, e.g., Alecto
X1 = piezo element (Conrad Electronics # 712930)
X2 = 3-pin 4-MHz resonator
F1 = fuse, 8A(T) (slow), with holder
F2 = fuse, 250 mA(T) (slow), with holder
PCB (alarm & transmitter): order code 000191-1
Disk, IC source code files, order code 000191-11 or Free Download
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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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