About the article

Speed Camera Warning Device

Drive wisely!

Speed Camera Warning Device
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.
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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
(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
C5,C6,C7,C8 = 22pF
C1,C2 = 22µF 50V
C3,C4,C8-C12 = 100nF
C13 = 33nF
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
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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