Elektor №3-4 (500) (2020).pdf

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lektor
Edition 2/2020 – March & April 2020
Edition 2/2020
|
March & April
|
www.elektormagazine.com
8-Page S
uppleme
nt:
Start-up
s at
productr
o
Fast Forw nica
ard 2019
magazine
The Elektor
LoRa Node
Versatile, long-range, 868-MHz remote control
with state feedback and STM32 Inside
ESP32 Doorbell
via Telegram
The Meadow F7 Board
“The UPS Man
Always Rings Once”
Andonstar AD407
Start-up Accelerator?
3-in-1 Oscilloscope
Analogue Electronics Design
The Elektor LoRa Node
Hexadoku
A great board for .NET developers
BASIC for the ESP32 and ESP8266
The Enviro+ RPi-HAT
Developer’s Zone
The Elektor ‘Intelekt’
Europe’s Most Successful
Joy-IT DMSO2D72 Portable
… and more
Chess Computer (1981)
ESP32 Doorbell via Telegram
How-To: Calculate the PSCC
Homebrew PC for the Electronics Lab
Locating Wayward Wires
Lab, Sweet Lab
The Meadow F7 Board
My First LoRaWAN
Elektor Magazine,
English edition
Edition 2/2020
Volume 46, No. 500
March & April 2020
Data Transmission
with Ease
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
In last November’s issue I hinted at our laboratory working on projects using
the LoRa radio protocol. This protocol allows data to be transmitted over
wide distances in a highly energy-efficient way. In the present issue you will
find two introductions to this exciting technology.
The Elektor LoRa Node
is a
flexible and configurable module that enables you to render your own projects
“LoRa compatible“. As an example application - also suitable of course for full
replication - we developed a remote control capable of switching an electric
appliance over distances of several hundred meters, with feedback on the
sender. As befits LoRa, such a node can be operated autonomously in the field
(using Li-Ion cells).
If you are keen to send sensor data to the Internet for access and use any-
where in the world you should take a look at the article
My First LoRaWAN.
Here we describe how to connect a board to the open “The Things Network“
with minimal effort. You can either use an existing gateway in your area, or
install your own inexpensive gateway which receives the sensor data over
LoRa.
Of course there are many more intriguing developments in the world of
microcontrollers. One of them is Artificial Intelligence, and you can count on
my colleagues and me to discover some innovations at the
Embedded World
exhibition, which we will report on later this year. Already available in our
online store is the MAix BiT Kit that permits entry-level explorations into the
fields of speech and image recognition, all programmable through the comfy
Arduino IDE! More about it in the next issues and of course up-to-date at
www.elektormagazine.com!
Jens Nickel
International Editor-in-Chief, Elektor Magazine
Memberships:
Please use London address
E-mail: service@elektor.com
www.elektor.com/memberships
Advertising & Sponsoring:
Margriet Debeij
Phone: +49 170 5505 396
E-mail: margriet.debeij@elektor.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.
The Circuit
International Editor-in-Chief:
Jens Nickel
Editor-in-Chief, English edition:
Jan Buiting
Membership Manager:
International Editorial Staff:
Denise Bodrone
Eric Bogers, Rolf Gerstendorf, Denis Meyer,
Dr Thomas Scherer, Clemens Valens
Laboratory Staff:
Mathias Claussen, Ton Giesberts,
Luc Lemmens, Clemens Valens, Jan Visser
Graphic Design & Prepress:
Publisher:
Giel Dols
Don Akkermans
© Elektor International Media b.v. 2020
Printed in the Netherlands
www.elektormagazine.com
March & April 2020
3
This Edition
Volume
47 – Edition 2/2020
No. 500
March & April 2020
6
Regulars
16 Interactive
Corrections & Updates || Questions &
Answers
18 Analogue Electronics Design
Case Study #1 — Section 2: Preamplifier
optimized for MEMS microphone
ESP32 Doorbell
via Telegram
34 Small Circuits Revival
Capita Selecta
from the Elektor Project
Suggestions Box
74 Steeped in Electronics
Ordering components from Ukraine and
Russia
78 Lab, Sweet Lab
A glimpse of The Holy Place —
no unauthorized entry
“The UPS Man
Always Rings Once”
84 How-To: Calculate the Prospective Short-
Circuit Current or PSCC
and choose the proper circuit breaker
29
Interview with
87 Peculiar Parts, the series
TMS1000 Series Microcontrollers
88 Starting Out in Electronics (2)
Easier than imagined!
Features
45 electronica Fast Forward 2020
Sign up for the Start-up Platform Powered
by Elektor
90 Developer’s Zone
Tips & Tricks, Best Practices and Other
Useful Information
104 Retronics: The Elektor ‘Intelekt’ Chess
Computer (1981)
Tiny Chess 86 ported to the Intel 8088
46 “A Strong Supporter of Open Internet”
Interview with Wienke Giezeman,
initiator of The Things Network
110 Beyond Electronics
PCB Art — Pushing the Limits of Industrial
Manufacturing
49 The Meadow F7 Board
A great board for .NET developers
120 Elektor Store
what’s available @ www.elektor.com
67 Raspberry Pi
Bash Command Cheat Sheet
68 Europe’s Most Successful
Start-up Accelerator?
HighTechXL, Eindhoven, The Netherlands
Wienke Giezeman
,
Initiator of
The Things Network
122 Hexadoku
The original Elektorized Sudoku
4
March & April 2020
www.elektormagazine.com
The Elektor
LoRa Node
Versatile, long-range,
868-MHz remote control
with state feedback
and STM32 Inside
The
Meadow F7
Board
lektor
26 BASIC for the ESP32 and ESP8266
Programming with Annex WiFi RDS
29 ESP32 Doorbell via Telegram
“The UPS Man Always Rings Once”
36 My First LoRaWAN
With Blue Pill, LoRa Breakout Board and
The Things Network
54 Practical ESP32 Multitasking (2)
Task priorities
60 Sigfox and the IoT (3)
First steps on the network
80 Optical Probe for Oscilloscopes
Measure brightness fluctuations of lighting
systems
82 The ’TABULA’ Project — An Update
Tangibles with user feedback
93 Locating Wayward Wires
Track and trace concealed and defective
cables with ease and certainty
100 Homebrew PC for the Electronics Lab
Tips on component choice and construction
A great board for .NET developers
71 Review: The Enviro+ RPi-HAT
49
productronica 2019 Start-up Guide
(8-Page Supplement)
112 Distrelec - Powering the Future
Education is the foundation for
innovation, and innovation needs
advocates.
114 They’re All Winners!
Start-ups @ productronica 2019
117 Fast Forward Award Finals
The FFA 2019 Jury report
Measure air quality with a Raspberry Pi and
the Enviro+ HAT
118 FFA 2019 Sponsors
Weller / Kurtz Ersa / Berstein / Almit
76 Review: Andonstar AD407
Better than its predecessor?
98 Review: Joy-IT DMSO2D72 Portable 3-in-
1 Oscilloscope
Next Edition
Elektor Magazine 3/2020
Weather Station 2020 • Experiments with AI • Nixie
Bargraph Thermometer 2.0 • Visualizing Sigfox Data •
E-Scooter Dismantled • Balancing Robot with Arduino
• Basic for ESP32: Applications • Triac Meets ATmega •
FreeRTOS and ESP32: Timers • Single-Chip ARM A7 and
M4 • Retronics • Small Circuits Revival • and more.
Elektor Magazine
edition 3/2020 covering May & June 2020 is published
around 7 May 2020. Delivery of printed copies to Elektor Gold Members is
subject to transport. Contents and articles subject to change.
Projects
46
6 The Elektor LoRa Node
Versatile, long-range, 868-MHz remote
control with state feedback and STM32 Inside
21 My IoT Button: A Button for the Web
Part 1: IoT architecture
www.elektormagazine.com
March & April 2020
5

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