About the article

Motorcycle Theft Alarm

with dual sensors, tamper protection and remote control

Motorcycle Theft Alarm
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.
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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
C1 = 100nF
D1 = IR LED, e.g., CQW13 (Conrad Electronics # 184551-89)
IC1 = PIC16F84-04/SO, programmed, order code 000191-41
JP1 = 2-way pinheader with jumper
K1 = 5-way pinheader
S1 = miniature pushbutton
X1 = 3-pin 4-MHz ceramic
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’
R1 = 47k?
R2 = LDR
R4,R4 = 10k?
R5 = 220k?
R6 = 4k?7
R7 = 1k?
P1,P2 = 10k?
C1,C2,C3,C5,C6 = 100nF
C4 = 100µF 16V radial
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
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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