Elektor Electronic (UK) 03-04 2017.pdf

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Edition 2/2017
|
March & April 2017
www.elektormagazine.com
RGBDigit Clock
OBD2 Handheld
with Raspberry Pi
and new diagnose software
AVR Playground
Improves the way
to do Arduino
colorful
7-segment display
Android on your Rpi part 1
• Starter Kits and Development Boards •
Swiss Pi Extensions •
Truly Random-Number Generator
• Debugging and
Decoding Digital Communication using the SmartScope •
RFID starter
kit for the Arduino Uno
• RGBDigit Clock •
IoT Gateway and Wireless Nodes
• Lead-acid Battery Activator 0-30V • NEC-style Remote Control Signals
with Elektor Uno R4 •
OBD2 Handheld using a Raspberry Pi
• Ethernet on
the Android I/O Board •
AVR Playground
• Retronics: made in Belgium
•
Walabot – a 3D Sensor for your Smartphone
• Dock for BBC micro:bit •
Build Your Own Theremin • Gnublin 2 Linux Board •
PWM Motor Control
• Sensors Make Sense part 3 •
Review: STEMlab125-10
• Q&A Electric
Motors •
Active Differential Probe v2
• MicroPython • Peculiar Parts
BBC micro:bit Dock
More I/O and easy access
Elektor Magazine
Edition 2/2017
Volume 43, No. 482
March & April 2017
ISSN 1757-0875
(UK / US / ROW distribution)
www.elektor.com
www.elektormagazine.com
Elektor Magazine, English edition
is published 6 times a year by
Elektor International Media
78 York Street
London W1H 1DP
United Kingdom
Phone: (+44) (0)20 7692 8344
Head Office:
Elektor International Media b.v.
PO Box 11
NL-6114-ZG Susteren
The Netherlands
Phone: (+31) 46 4389444
Fax: (+31) 46 4370161
Order must be
Based on discussions and correspondence with electronics engineers these past 2
5
years I
estimate that roughly �½√2 (70.7 per cent) of them never start reading here as the Pub-
lishers like to think. Instead, after removing the plastic wrapper and binning the address
sheet, they dash off straight to a page showing an intricate or novel piece of technology,
say, an RGBDigit Clock, something OBD, a Theremin, or a 1960’s tubed oscilloscope.
That’s pages 6, 26, 46, 82 — and yes I admit I am also in the 70.7 % group.
As of this edition our French- and German language magazines are also on two-monthly
publication at 132 pages per issue. This has permitted the joint lab/editorial/layout team
to do a soft reset aiming at synchronizing the production scheme of articles and projects.
Rather than forcing some existing material into the rigid Learn/Design/Share structure it
was decided to enhance the article layout and abandon the fixed order and page allot-
ments of the L/D/S sections.
Engineers can’t do without labelling and classification though and consequently the page
headers
e-Labs Project
and
HomeLab Project
have been retained and stronger than before
emphasize the distinction between reader-contributed material on the one hand and tried
and tested stuff developed and approved by our Labs. This distinction apparently has
escaped many of you despite some of my feeble attempts here to elucidate, trigger and
control. One notable section also honored with a page header block is
Retronics,
which
now happily disrupts the flow of pages on new-fangled stuff rather than sit modestly at
the back of the magazine always close to Hexadoku, another fireside favorite.
Signing off with this edition my valued colleague and former Elektor Netherlands Editor
Harry Baggen is retiring after 38 years with the company. Many of you will know Harry
not only from his magnificent audio projects like high-end amplifiers and loudspeakers,
but also from technical correspondence and advice at which he excelled. The same for his
Memberships:
Please use London address
E-mail: service@elektor.com
www.elektor.com/memberships
Advertising & Sponsoring:
Johan Dijk
Phone: +31 6 15894245
E-mail: johan.dijk@eimworld.com
www.elektor.com/advertising
Advertising rates and terms available on
request.
Copyright Notice
The circuits described in this magazine are for domes-
tic and educational use only. All drawings, photographs,
printed circuit board layouts, programmed integrated
circuits, disks, CD-ROMs, DVDs, software carriers, and
article texts published in our books and magazines
(other than third-party advertisements) are copyright
Elektor International Media b.v. and may not be repro-
duced or transmitted in any form or by any means,
including photocopying, scanning and recording, in
whole or in part without prior written permission from
the Publisher. Such written permission must also be
obtained before any part of this publication is stored
in a retrieval system of any nature. Patent protection
may exist in respect of circuits, devices, components
etc. described in this magazine. The Publisher does
not accept responsibility for failing to identify such
patent(s) or other protection. The Publisher disclaims
any responsibility for the safe and proper function
of reader-assembled projects based upon or from
schematics, descriptions or information published in or
in relation with Elektor magazine.
writing of hundreds of articles in a manner best described as
S/N
> 60 dB.
Happy reading,
Jan Buiting, Editor-in-Chief
The Circuit
Editor-in-Chief:
Deputy Editors:
Translators:
Jan Buiting
Thijs Beckers, Clemens Valens
David Ashton, Jan Buiting, Martin Cooke,
Ken Cox, Arthur deBeun, Andrew Emmerson,
Tony Marsden, Mark Owen, Julian Rivers
Membership Manager:
Raoul Morreau
Denis Meyer, Jens Nickel
Laboratory Staff:
Ton Giesberts, Luc Lemmens,
Clemens Valens, Jan Visser
Graphic Design & Prepress:
Giel Dols
Publisher:
Don Akkermans
International Editorial Staff:
Thijs Beckers, Mariline Thiebaut-Brodier
© Elektor International Media b.v. 2017
www.eimworld.com
Printed in the Netherlands
www.elektormagazine.com
March & April 2017
3
This Edition
Volume 43 – Edition 2/2017
No. 482
March & April 2017
6
26
Regulars
11 The Elektor Community
31 Elektor Labs Pipeline
62 HomeLab Helicopter
82 Retronics: Made in Belgium
Bilingually, naturally
88 Q&A: Electric Motors
A first acquaintance
96 Peculiar Parts, the series
Bubble Memory
128 Elektor STORE
130 Hexadoku
OBD2 Handheld using a
Raspberry Pi
With new diagnostic software
The Pi-OBD-HAT is an off the shelf
add-on board for the Raspberry Pi
which converts the tiny computer
into a dedicated OBD2 diagnostic
tool. One disadvantage was the
need of a terminal program
running on a PC for
control. A much
more convenient
and neater solution
is provided
by the HHGui
OBD2 diagnostic
software.
Features
12 Starter Kits and Development Boards
A brief round-up
58 Debugging and
Decoding Digital Communication
using the SmartScope
64 Review: STEMlab125-10
The little brother of the original Red Pitaya
108 RFID starter kit for the Arduino Uno
Temperature sensing
and door entry system
112 Designing loudspeaker boxes
Free programs for speaker box calculations
23 How to Produce
NEC-style Remote Control Signals
Exclusively for the Elektor Uno R4
26 OBD2 Handheld using a Raspberry Pi
Projects
6 RGBDigit Clock
A colorful 7-segment display for your data
With new diagnostic software
32 Swiss Pi Extensions
Hardware extensions
42 Ethernet on the Android I/O Board
Using a USR-TCP232-T module
18 IoT Gateway and Wireless Nodes
Part 1: The hardware
46 Build Your Own Theremin
Using JFETs instead of vacuum tubes
4
March & April 2017
www.elektormagazine.com
A colorful
7-segment display
for your data
RGBDigit
Clock
magazine
90 Dock for BBC micro:bit
“Base to micro:bit,
you are cleared to dock.”
97 PWM motor control
With added duty cycle boost
100 Sensors Make Sense (3)
For Arduino and more
106 Active Differential Probe v2
Now USB-powered
114 Gnublin 2 Linux Board
A build-it-yourself alternative
to the Raspberry Pi
118 MicroPython
Python for small systems
120 Lead-acid Battery Activator 0-30V
Also shows the battery quality
Next Editions
AVR Playground
Elektor Magazine 3/2017
Improves the way to do Arduino
The board presented in this article is a hybrid of
an Arduino Uno and a traditional microcontroller
development board, intended for ‘doing Arduino’
without bad connections and loose wires (although it
doesn’t disallow it).
50
Studio Mic Preamp • Li-Ion charger • Spycam detector
• Outside Lighting System • L-Board — a T-Board alter-
native • nWatch • 4-Channel Remote Control with XBee
• IoT Gateway and Wireless Nodes — Part 2: Software •
and much more.
Elektor Magazine edition 3/2017 covering May and June is
published on 13 April 2017. Delivery of printed copies to Elektor
Gold Members is subject to transport.
Elektor Business Magazine 1/2017
Embedded, Microcontrollers & Tools
50 AVR Playground
Improves the way to do Arduino
66 Truly Random-Number Generator
Meets NIST standard
with cheap components
90
74 Walabot –
a 3D Sensor for your Smartphone
Also sees through walls
76 Android on your Raspberry Pi (1)
Using GPIO Pins
for measurement and control functions
Hubs Become Central to the IoT (Altera/Intel) • Server
Based Solutions for Self-Organizing Networks (Artesyn)
• From Makers to Market using 96Boards (Arrow); In-
dustry Predictions for 2017 (ByteSnap) • WaWision (em-
bedded projects) • Infographics • from the Garage up to
Industrial Production (Loetronic) • LPCXpert (NXP) • Net-
work Engine SoC (Renesas) • The Business Case for Com-
mercial Embedded Linux (Wind River) • Talking Heads •
A Desktop Prototyping Tool for Custom PCBs (Voltera) •
and more.
Elektor Business Magazine edition 1/2017, special edition for
Embedded World Nürnberg, is published on 1 March 2017.
Content and article titles subject to change.
www.elektormagazine.com
March & April 2017
5

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