Car Tilt Alarm
Protect your alloy wheels
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Materials
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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Extra info / Update
- trigger angle: 0–25°
- operating time adjustable 0–165 s;
- two activation modes: intermittent @ 0.5 Hz or continuous
- built-in installation aid.
Component list
R1 = SIL array 8x 4.7kOhm
R2,R3,R4 = 1kOhm
R5 = 330Ohm
R6 = 4.7kOhm
R7 = 10kOhm
Capacitors
C1 = 470µF 25V axial electrolytic
C2 = 100µF 25V axial electrolytic
C3, C6 = 100nF
C4, C5 = 15pF ceramic
Semiconductors
IC1 = PIC16F877-20/P, programmed
IC2 = 7805
IC3 = ULN2803A
IC4 = 4N25 or equivalent
D1 = 1N4001
D2–D9, D12–D15 = 1N4148
D10, D11 = LED, 3mm
Miscellaneous
X1 = 8MHz quartz crystal, low profile
JP1–JP4, JP5–JP8, JP9–JP12 : 8-way (2x4) DIL pinheader with jumpers
S1 = 4-way DIP switch block
RE1 = relay, 12V coil, miniature, 2RT
K1,K2,K5,K6 = 3-way SIL pinheader, lead pitch 2.54mm (0.1")
Support for on/off LED, colour and diameter to personal requirements
2-axis accelerometer module with ADXL322 (Lextronic France # ADXL322)
Fuse and in-line fuseholder for vehicles
Standoffs, screws, case, etc.
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