BBC Micro:bit in Practice
Description
Key Features
Explore hardware programming and leverage the power of the BBC Micro:bit and MicroPython
Build real-life creative projects step by step with each chapter increasing in complexity and interactivity
Learn the features of the Micro:bit and how to interface it with electronic components through circuits and code examples
Book DescriptionThis book is a one-stop guide for learning BBC Micro:bit with MicroPython, exploring many hardware components and programming techniques to provide detailed insights into developing practical applications with the Micro:bit. It will also show you how hardware components can be manipulated using a combination of Micro:bit and MicroPython for developing practical projects. BBC Micro:bit in Practice will help you gain a holistic understanding of the BBC Micro:bit platform and MicroPython programming, guiding you through mini projects aimed at developing practical knowledge of circuit design and writing programs. You'll learn how to write programs for working with built-in LEDs and buttons, interfacing external LEDs, buttons, motors, buzzers, and much more. You'll also work with built-in radio, speakers, accelerometer, and a compass. You'll dive into concepts related to the Micro:bit filesystem, interfacing external displays, and working with libraries in detail before exploring sewable circuits and wearable technology. After reading this Micro:bit book, you'll understand how to apply principles in electronics and MicroPython to create interesting real-life projects from scratch.What you will learn
Explore the essentials of the BBC Micro:bit, its hardware specifications, and versions
Program built-in and external LEDs and buttons
Program external LED-based displays, buzzers, and stepper motors
Use analog input and pulse width modulation to drive a servo motor
Detect gestures with internal sensors such as accelerometer, compass, and magnetometer
Work on projects with built-in features such as music, speech, radio, and filesystem
Explore the advanced features of the Micro:bit
Who this book is forThis book is for anyone who wants to use the combination of MicroPython and the BBC Micro:bit for building exciting real-life projects. Engineers, researchers, hobbyists, and technology instructors working in areas such as embedded systems, electronics, software development, IoT, robotics, teaching, and training will find this book useful for building projects. Prior experience with building basic electronic circuits and any programming language, not necessarily MicroPython, will be helpful.
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Persons
Ashwin Pajankar is an author, a YouTuber, and an instructor. He graduated from the International Institute of Information Technology, Hyderabad, with an MTech in Computer Science and Engineering. He has been writing programs for over two and a half decades. He is proficient in Linux, Unix shell scripting, C, C++, Java, JavaScript, Python, PowerShell, Golang, HTML, and assembly language. He has worked on single-board computers such as Raspberry Pi and Banana Pro. He is also proficient with microcontroller boards such as Arduino and the BBC Micro:bit. He is currently self-employed and teaches on Udemy and YouTube. He also organizes programming boot camps for working professionals and software companies.Sharma Abhishek :
Abhishek Sharma completed his BE in Electronics Engineering from Jiwaji University, Gwalior, India, and his PhD in engineering from the University of Genoa, Italy. He is presently working as an assistant professor in the Department of Electronics and Communication Engineering at the LNM Institute of Information and Technology, Jaipur, India. He is the coordinator of the ARM University Partner Program, Texas Instruments Lab, and Intel Intelligent Lab at the LNM Institute of Information and Technology and the center lead of LNMIIT-Center of Smart Technology (L-CST). His research interests are real-time systems and emerging technologies.Saini Sandeep :
Sandeep Saini works as an assistant professor in the Department of Electronics and Communication Engineering at the LNM Institute of Information and Technology, Jaipur, India. He has taught robotics and electronics subjects at the university level in India and abroad for over a decade. He has taught more than 8,000 students online and offline during this time. He received a BTech and MS in Electronics and Communication Engineering from the International Institute of Information Technology, Hyderabad, India. He received his PhD from Malaviya National Institute of Technology (MNIT), Jaipur, India. He has written 6 books and published 35 peer-reviewed journals and conference papers.
Content
Introduction to the BBC Micro:bit
Setting Up the Micro:bit and Using Code Editors
Python Programming Essentials
Advanced Python
Built-in LED Matrix Display and Push Buttons
Interfacing External LEDs
Programming External Push Buttons, Buzzers, and Stepper Motors
Exploring the Filesystem
Working with Analog Input and PWM
Working with Acceleration and Direction
Working with NeoPixels and a MAX7219 Display
Producing Music and Speech
Networking and Radio
Advanced Features of the Micro:bit
Wearable Computing and More Programming Environments
1
Introduction to the BBC Micro:bit
I certainly hope that you have read the preface and the table of contents, which provide a fair idea about our journey into the amazing world of the BBC Micro:bit (also written as Micro:bit or Micro Bit). This introductory chapter will warm you up for the upcoming exciting journey into the vast world of the Micro:bit. The road ahead is full of interesting concepts and projects. It is always a good idea to prepare well for the journey ahead, and this chapter will accomplish that.
We will explore the following topics in this chapter:
- The history of the Micro:bit
- The specifications of Micro:bit V1 and Micro:bit V2
- Powering up the Micro:bit
- Breakout boards
- Fritzing to create circuit diagrams
Let's get started!
Technical requirements
We will need the following hardware for this chapter:
- BBC Micro:bit V1 or V2
- A computer with Windows, macOS, or Linux
- A BBC Micro:bit edge connector
- A Micro-USB to USB cable
- An internet connection
- A mobile power bank
- Kitronik Mi:power
The history of the Micro:bit
It is important to know the history of the BBC Micro:bit. The British Broadcasting Corporation (BBC) is the United Kingdom's public broadcaster. It is also the world's oldest and biggest broadcaster. BBC has always been pioneering in creating programs for outreach in science and technology to improve the public understanding of science. Its programs include various documentaries and television series.
One such interesting television series was The Computer Programme. It was broadcast on BBC Two and used a home computer, the BBC Micro, conceptualized by the BBC and developed by Acorn Computers. The TV series was a part of the BBC Computer Literacy Project. The BBC Micro had six different models, which were all based on the famous MOS Technology 6502 8-bit microprocessor. It is a simplified and faster version of the Motorola 6800 microprocessor. The 6502 is a very popular microprocessor, and variants of it were used in popular video game consoles and computers such as Atari 2600, Apple II, Nintendo Entertainment System (popularly known as NES or Famicom), Commodore 64, and, of course, the BBC Micro. The BBC Micro was very successful, and it made a great impact in the computer education sector, leaving a great legacy behind.
In 2012, with the release of Raspberry Pi, a new era was ushered into the world of computing and education. Through the Computer Literacy Project, the BBC sought to build upon the legacy of the BBC Micro after the great success of Raspberry Pi. It onboarded many partners from industry, such as Microsoft, and academia, such as Lancaster University. The first version (now referred to as the Micro:bit V1) was launched in July 2015 and was available for general sale in March 2016. The BBC also gave hundreds of thousands of Micro:bits to school children in the UK as a part of science education outreach. After the Micro:bit successfully launched, the BBC formed a not-for-profit organization known as the Microbit Foundation.
Note
For more details, you can visit the home page of the Microbit Foundation at https://microbit.org/.
In October 2020, the Microbit Foundation released the second version of the Micro:bit. V2 has got better specifications than V1 at the same price. We will explore the specifications of V1 and V2 side by side in the following section.
The specifications of Micro:bit V1 and Micro:bit V2
The following table compares the features of the BBC Micro:bit V1 and V2 side by side (source: https://microbit.org/):
BBC Micro:bit
V1
V2
Processor
Nordic nRF51822
Nordic nRF52833
Flash memory
256 KB
512 KB
RAM
16 KB
128 KB
Speed
16 MHz
64 MHz
Bluetooth
Bluetooth 4.0
Bluetooth 5.1 with Bluetooth Low Energy (BLE)
Radio communication
2.4 GHz radio (80 channels)
2.4 GHz radio (80 channels)
Buttons
Two programmable (A and B) and one system (reset)
Two programmable (A and B) and one system (power/reset)
On/off switch
None
Press and hold the rear power button
Touchpad
None
Touch-sensitive logo
Microphone
None
Onboard Knowles SPU0410LR5H-QB-7 MEMS microphone (with LED indicator)
Display
5x5 programmable LED matrix (25 LEDs in total)
5x5 programmable LED matrix (25 LEDs in total)
Speaker
None
Onboard JIANGSU HUANENG MLT-8530 (up to 80 dB)
Motion sensor and compass
LSM303AGR
LSM303AGR
Temperature sensor
On-board temperature sensor
On-core NRF52
Edge connector
25 pins
25 pins
Table 1.1 - Comparison of the features of BBC Micro:bit V1 and V2
The processors used in both versions are a special type of processor known as a System on Chip (also abbreviated as SoC or SOC). An SoC is an Integrated Circuit (IC) that has all or most components of a complete working computer system. A typical SoC has a processor, flash memory, and RAM. Both versions employ Advanced RISC Machines (ARM) processors. The ARM uses Reduced Instruction Set Computer (RISC) instruction architecture. The V1 uses Nordic nRF51822 SoC (https://www.nordicsemi.com/Products/nRF51822), and the V2 uses Nordic nRF52833 (https://www.nordicsemi.com/products/nrf52833). The Random Access Memory (RAM) is used to execute the programs. The flash memory is used to store the programs, and it is reprogrammable.
The following diagram shows the front faces of V2 and V1 side by side:
Figure 1.1 - Hardware features on the fronts of V2 and V1 (courtesy: ©Micro:bit Educational Foundation/microbit.org)
The following diagram shows the rear of the V2...
