Speed Camera Warning Device
Drive wisely!
Published in issue 383, November 2008
The little module described here lets you detect geographical points of interest (POIs) using the frames output from a GPS receiver module. These POIs might be restaurants, petrol stations, or —why not? — the positions of fixed speed cameras! The project was developed using Elektor's Flowcode and E-Blocks.
Resistors
(0.25W 5%)
R1,R8,R12 = 10kOhm
R2,R3,R7 = 220Ohm
R4 = 3kOhm3
R5 = NSL4960 (LDR)
R6 = 1kOhm
R9, R10 = 1kOhm8
R11 = 470Ohm
R13 = 15kOhm
R14 = 1kOhm5
R15, R16 = 27Ohm
R17 = 4kOhm7preset
R18 = 68Ohm
Capacitors
C5,C6,C7,C8 = 22pF
C1,C2 = 22µF 50V
C3,C4,C8-C12 = 100nF
C13 = 33nF
Semiconductors
D1 = LED, 3mm, green
D2 = LED, 3mm, bi-colour
T1 = BC547
IC1 = 7805
IC2 = PIC16F876A-I/SO, programmed, Elektor SHOP # 080615-41
IC3 = FT232BL
IC4 = 74HC241DW
IC5 = EM406A GPS receiver (Sparkfun, Lextronic)
IC6 = 24FC1025
Miscellaneous
X1 = 20MHz quartz crystal
X2 = 6MHz quartz crystal
LCD1 = LCD, general purpose, 2 lines,16 characters, with backlight
BZ1 = KPEG110 buzzer (Farnell)
K1 = cigarette lighter plug
K2 = USB-B socket
K3,K4 = 6-way SIL socket strip
S1 = switch, 1 pole, 2 positions
Enclosure, Hammond type 1591XXCBK (Farnell)
PCB, Elektor SHOP # 080615-1
Project software: free download from project web page
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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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