Elektor Electronics 2005-10

Elektor Electronics 2005-10, 2005

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October 2005
£3.70
www.elektor-electronics.co.uk
™xHRKCQIy451111zv,:!
Yes that's right, down
town, down under in
Sydney Australia. We are a bunch
of electronics enthusiasts who sell a great
range of goodies through our FREE 400 page
catalogue! (see below) Don't be frightened!
You can purchase on the Net from us 24/7/365
through our secure encrypted system. Post and
packing charges are modest and you can have
any of 8000 + unique products delivered to
your door within 7 - 10 days of your order.
Some specific products are shown below.
Performance Electronics for Cars Book
BS-5080 £6.35 + post & packing
Australia’s leading electronics magazine, Silicon Chip, has developed a range of projects
for performance cars. There are 16 projects in total, ranging from devices for remapping
fuel curves, to nitrous controllers, and more! The book includes all instructions,
components lists, colour pictures, and circuit layouts. There are also chapters on engine
management, advanced systems, DIY modifications, and more. Over 150 pages! All of
the projects described are available in kit form, exclusively from Jaycar. Check out our
website for all the details.
Here are just two....
Theremin Synthesiser Kit
KC-5295 £17.50 + post & packing
The Theremin is a weird musical instrument that was
invented early last century but is still used today. The Beach
Boys’ classic hit “Good Vibrations” featured a Theremin. By
moving your hand between the antenna and metal plate,
you create weird sound effects like in those scary movies!
Kit includes a machined, silk-screened, and pre drilled
case, circuit board, all electronic components,
and clear English instructions.
Universal Voltage Switch Kit
KC-5377 £8.70 + post and packing
This is a universal module which can be adapted to suit
a range of different applications. It will trip a relay when
a preset voltage is reached. It can be configured to trip
with a rising or falling voltage, so it is suitable for a
wide variety of voltage outputting devices eg., throttle
position sensor, air flow sensor, EGO sensor. It also
features adjustable hysteresis (the difference between
trigger on/off voltage), making it extremely versatile.
You could use it to trigger an extra fuel pump under
high boost, anti-lag wastegate shutoff, and much more.
Kit supplied with PCB, and all electronic components.
Smart Fuel Mixture Display
KC-5374 £8.15 + post & packing
This new ‘smart’ version has a few additional touches
such as, auto dimming for night driving, emergency
lean-out alarm, and better circuit protection. Another
great feature, is the ‘dancing’ display which operates
when the ECU is operating in closed loop. Closed
loop means that the air/fuel ratio is optimum for fuel
economy and emission performance. Kit supplied
with PCB and all electronic components.
•
Car must be fitted with air flow and EGO sensors
(standard on all EFI systems) for full functionality.
9VDC power supply
required (Maplin
#GS74R £9.99).
50MHz Frequency Meter Kit
with LCD Display
KC-5369 £20.30 + post & packing
If you want a great value frequency meter, then this project is
for you. It features autoranging operation for ease of use,
switching between its three ranges. High resolution of 0.1Hz
up to 150Hz, 1Hz between 150Hz and 16MHz, and 10Hz
above 16MHz. It can be powered by a 9V battery or
wall adaptor (not included) and the
case measures just 5 1/8” x 2 5/8” x
1”. Kit includes laser cut & silk
screened case, circuit board,
electronic components, & clear
English instructions.
Recommended box
UB2 £0.97 each
Recommended box
UB3 £0.97 each
Digital Fuel Mixture Display
KC-5300 £18.30 + post and packaging
Monitor your car’s air fuel ratio in real time on
a three-digit display as well as on the
programmable 10-LED bargraph. The kit will
indicate ratios between 11.8 & 20.6 for petrol
and 12.7 & 21.5 for propane/LPG. Features
include: lean and rich indication, fast 220ms
update time for bargraph, 440ms update time
for 3-digit display, 0-1V display for setting up
adjustments, dot or bar option for bargraph
and automatic display dimming for night
driving. All this in a case measuring just 3.25 x
2.12 x 1.22 in. Kit includes case with
silk-screened panel, PCBs, pre-programmed
PIC micro, 7-segment displays, red acrylic,
hook-up wire and all electronic components.
Electronic Components,
Sub-Assemblies & Electronic Kits
Power Products &
Accessories
Audio & Visual Equipment
& Accessories
Computer & Telecoms
Accessories
Burgular Alarms &
Surveillance Equipment
Lighting Products &
Accessories
Gadgets & Unique Gifts
Lead Acid Battery Zapper Kit
KC-5414 £11.75 + post and packing
This simple circuit is designed to produce bursts of high-energy
pulses to help reverse the effects of sulfation in "wet" lead acid
batteries. This is particularly useful when the battery has been
sitting for a period of time without use. Kit includes circuit board,
case, leads, electronic components, and clear English instructions.
Caution: Battery should be
disconnected from the
vehicle when using this project
Post and Packing Charges:
Order Value Cost
£20 - £49.99 £5
£50 - £99.99 £10
£100 - £199.99 £20
£200 - £499.99 £30
£500+ £40
Max weight 12lb (5kg) - heavier parcels
POA. Minimum order £20.
Log on to
www.jaycarelectronics.co.uk/elektor
for your FREE catalogue!
0800 032 7241
(Monday - Friday 09.00 to 17.30 GMT + 10 hours only).
For those who want to write:
100 Silverwater Rd Silverwater NSW 2128
Sydney AUSTRALIA
We
Stock...
 MikroElektronika
from Breadboarding Systems
Make PICmicro
®
development easy with the EasyPIC
3
-
only £99!
EasyPIC
3
Development Board features:
•
High quality development/experiment board with
built-in USB 2.0 high-speed programmer.
•
Programming software compatible with Windows
operating systems including 2000 and XP.
•
Comes with a PIC16F877A microcontroller but
compatible with virtually all 8, 14, 18, 28 and 40-
pin PICmicro
®
devices in the 10F, 12F, 16F and
18F families.
•
On-board I/O devices including switches, LEDs,
seven-segment displays, potentiometers and RS-
232 interface. Now also features USB and PS/2
keyboard interface connectors.
•
Provision for easy fitting of optional DS18S20
temperature sensor, and LCD and GLCD dis-
plays.
The new EasyPIC3 Development Board combines a
versatile development/experiment board with a built-in
USB programmer. With its wealth of on-board
I/O devices and support for virtually all 8, 14, 18, 28 and
40-pin PICmicro
®
microcontrollers in the 10F, 12F, 16F
and 18F families, we’re certain you won’t find a more ver-
satile high quality board at such a low price. The
EasyPIC3 Development Board is supplied with USB pro-
gramming/power cable, programming software and useful
example programs.
Also available are similar boards for the 8051, AVR and
dsPIC, each at the same great price of £99 including UK
delivery and VAT—please telephone or see our website
forfurther details.
•
All I/O lines available for off-board expansion.
•
Wide range of optional add-on boards available
including ADC, DAC, EEPROM, Compact Flash,
MMC/SD, Keypad, RTC, RS-485, CAN and IrDA.
Additional add-ons available soon.
•
Powered from your PC’s USB port or optional
mains adapter.
•
Supplied with example programs written in
assembly language, BASIC, C and Pascal.
•
Supplied with Microchip Technology’s MPLAB
development software and demonstration
versions of MikroElektronika’s mikroBASIC,
mikroC and mikroPascal compilers.
Learn about microcontrollers with our EasyPIC
3
StarterPack
-
just £149!
We’ve taken the EasyPIC3 Development Board and added a 16x2 character LCD display, 128x64 graphical LCD,
DS18S20 temperature sensor, RS-232 serial communications cable and our own easy-to-follow microcontroller
tutorial to form a complete and self-contained Starter Pack—everything you need to learn about and experiment
with microcontrollers! With this pack you will quickly become proficient in microcontroller programming and
interfacing. Please see our website for full list of covered topics.
Make programming easy too with
mikroBASIC
,
mikroC
and
mikroPascal
Threeincredibly easy-to-use yet powerful compilers for PICmicro
®
microcontrollers, each featuring a user-friendly
code editor, built-in tools and routines and source-level debugger. Supplied libraries facilitate rapid development
and include ADC, CAN, Compact Flash, EEPROM, Ethernet, Graphic LCD, I
2
C, LCD, 1-wire, PWM, RS-485,
sound, SPI, USART, USB routines and many more. mikroBASIC and mikroPascal—£99 each, mikroC—£149.
Call
0845 226 9451
or order online at
www.breadboarding.co.uk
All prices include UK delivery and VAT. Major credit and debit cards accepted. Secure online ordering.
10/2005 - elektor electronics
3
MICROCONTROLLER DEVELOPMENT TOOLS
e
lektor
Input threshold:
(almost) zero
For some mysterious reason we get
emails from readers timidly asking if
they can contribute to the magazine.
The answer is almost invariably, Yes,
we will only be too pleased to have a
look at what you are proposing in the
way of an article, be it a construction
project, a news item or a background
story. Our
Author Guidelines
may be
found on the
Service
page of our
website and the word is out that we
pay between 60 and 100 pounds per
published page depending on the
amount of re-engineering or editorial
work. In the case of projects, once
your proposal has been accepted for
publication (and that may take us
quite some time to decide, sorry) you
will be ‘handed over’ to one of our in-
house design engineers who will, I
have noticed on several occasions,
bend over backwards to turn your
humble idea into a full-blown DIY pro-
ject in Elektor style, possibly with a
PCB and software to download.
We are currently the only English-lan-
guage electronics magazine in the
world with a fully equipped in-house
design lab and 30 years consistency
in PCB design. I guess that’s the rea-
son why readers ask if they may con-
tribute to Elektor Electronics in the first
place: with the exception of Readers
Circuits (which are clearly identified
as such by a footer text) our articles
contain circuit diagrams and PCB
designs with uniform characteristics
often described as ‘Elektor style’.
Our design engineers will happily turn
an idea on the back of an envelope
into an Elektor PCB and the editorial
team is ready to correct, expand,
restructure and generally improve your
write-up to produce an article with
impact and appeal to tens of thousands
of readers. The only proviso is that your
idea is original and not overly spe-
cialised as that limits the number of
readers who will be interested. A pro-
totype plus a mention of what you actu-
ally do with your design will consider-
ably help your case. Over to you!
14 B
IOMETRICAL
I
MAGING
Biometry is likely to be used in the near future for passports and many
other applications related to security and identification. However, the
performance of biometry for many applications is not yet good
enough and a lot of research is required to obtain the necessary
improvements. In this article we provide some insight into the technol-
ogy used and we not only discuss how and why biometry works but
also why the systems sometimes fail.
20 Fingerprint as Password
Passwords have not shown themselves to be a foolproof form of
identification, and the trend is now towards biometric methods,
including fingerprints, becoming more widely used. We look
at how fingerprint sensors work and at the advantages
and disadvantages of the various techniques.
Jan Buiting
Editor
lectronics
leading the way
lectronics
CONTENTS
Volume 31
October 2005
no. 347
know-how
14
Biometrical Imaging
20
Fingerprint as Password
58
WiMAX Primer
32 Colossus Jr.
hands-on
32
Colossus Jr.
38
27C512 Emulator
54
Remote Control Operator
68
Mini Project: Flash Lock for PCs
72
Labtalk: the noiseless PC
74
Design Tips
Cascode stage
Pot as interrupt generator
There is another use for cryptography, which has more to
do with keeping things in the open. This other use, which
rightly belongs in this issue on All Things Security, is data
authentication: techniques for verifying that data has not
been tampered with.
technology
28
Fingerprint Sensors
48
Delphi for
Electronic Engineers (8)
64
TIRIS RFID Reader
info & market
6
Colophon
8
Mailbox
9
Corrections & Updates
10
News & New Products
82
Elektor SHOP
84
Sneak Preview
38 27C512 Emulator
infotainment
In this article, we work through the entire design process
for a CPLD project from start to finish using a practical
example. The result is a handy 27C512 EPROM emulator
that is useful for debugging microcontroller systems.
77
Retronics:
Elektor Time Standard (1988)
78
Quizz’away (13)
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