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Raspberry Pi USER MANUAL

With a Raspberry Pi you can learn to code, build your own web server, create interesting and amazing projects and even build a robot. This book will help you through the entire Raspberry Pi experience, from buying your first RPi to getting it up and running and beyond. We look at how the Raspberry Pi works and guide you through the inner workings of the powerful operating system. Read on and learn how to unlock the potential of the amazing Raspberry Pi… Master your tech @ www.pclpublications.com…

Raspberry Pi USER MANUAL

Get Started with the Raspberry Pi

Your journey with this amazing little computer begins here. Say hello to the Raspberry Pi; learn how it works, what kind of operating system it has, what you need to get it up and running and much more. This is your first step into the world of the Raspberry Pi. In this section, you’ll discover what makes the Raspberry Pi such a fabulous little computer and project board. There are in-depth guides to the hardware, operating system, what you’ll need to begin with and enjoying the software the Pi has to offer from your computer’s desktop. Now let’s see what this amazing computer has to offer.…

Get Started with the Raspberry Pi

Say Hello to Raspberry Pi

The Raspberry Pi is a British built low cost computer that enables everybody to learn computing, start programming and explore basic electronics. It’s the size of a credit card but capable of running a full operating system and doing everything a desktop does. More importantly, with the Raspberry Pi you install your own operating system, connect all your devices and create your own programs using languages like Scratch and Python. There’s no case so you can hook up electronic circuits to the pins and control them to get input and output, so you can hack together electronic projects at home. Setting up a Raspberry Pi is pretty simple, and throughout this book we’ll take you step-by-step from unboxing your Raspberry Pi to setting it up and getting started. There are…

Say Hello to Raspberry Pi

Get to Know the Raspberry Pi 3

40 GPIO Pins The GPIO (General Purpose Input Output) pins can be accessed directly on the Raspberry Pi. These are used in projects to connect the Raspberry Pi to electronic circuits and control electric devices. Some can be turned on and off while the Raspberry Pi is running. ARM-Powered At the heart of the Raspberry Pi 3 is a Broadcom BCM2837 System on Chip (SoC). It contains a powerful 1.2GHz 64-bit quad-core ARM Cortex-A53 CPU. This is 50-60 percent faster than the Raspberry Pi 2 and ten times as fast as the original Raspberry Pi. DSI The Display Interface (DSI) can be used to connect a display directly to the Raspberry Pi board. SD Card Slot Instead of a hard drive you use an SD Card with the Raspberry Pi.…

Get to Know the Raspberry Pi 3

Up Close with the Raspberry Pi 4 Model B

FASTER AND CONNECTED There’s a lot to like about the Raspberry Pi 4: Up to 8GB of on-board memory, a faster quad-core CPU, support for dual 4K displays via a pair of micro-HDMI ports, and more. Let’s take a look at the Pi 4, and see what it’s got under-the-hood. Improved GPU With a VideoCore 6 GPU, the Pi 4 is capable of 4K resolutions at 60FPS (Frames per Second), and thanks to some tweaks to the video codes in both Raspberry Pi OS and the version of VLC packaged with Raspberry Pi OS, the Pi 4 is now a pretty decent media device. Improved Processing The 1.5GHz, 64-bit quad-core ARM Cortex-A72 CPU, is the driving force behind the Pi 4’s improved performance. Thanks to this CPU, you’re able to…

Up Close with the Raspberry Pi 4 Model B

Raspberry Pi 5 In Depth

HAT & GPIO Interface The Raspberry Pi is made with expansion in mind. External peripherals and items are often attached here. ‘HAT’ stands for Hardware Attached on Top’, which is where many things connected to the Pi sit, and GPIO is ‘General Purpose In/Out’, which refers to the data flow from and to the Pi. Powerful CPU The Raspberry Pi 5 is powered by a 64-bit quad-core Arm Cortex-A76 processor running at 2.4GHz, giving a performance boost of between two and three times what the Raspberry Pi 4 could achieve. It also has a Broadcom VideoCore VII GPU. Power Button With previous Raspberry Pi models, to turn it off and turn it on again you had to pull the power lead out or switch it off at the mains. At…

Raspberry Pi 5 In Depth

The Raspberry Pi 5 and Beyond

The Raspberry Pi 5 has totally changed the game! There are two versions, one with 4GB and one with 8GB of RAM. The processor is a quadcore Arm Cortex-A76 running at 2.4GHz, which is faster than the chip in the Raspberry Pi 4. And guess what? There’s a power button on the board! No more fiddling with the mains or pulling the power lead out of the USB-C socket. Just press a button and you’re good to go. The button is on the front of the computer, opposite the Ethernet and USB ports. So, if you have an old Raspberry Pi 4 case, you’ll need to get a new one that’s specifically designed for the Pi 5. The Raspberry Pi Foundation already sells them, and other companies will probably make…

The Raspberry Pi 5 and Beyond

Up Close with Pi 500

FASTER AND CONNECTED There’s a lot to like about the Pi 500: with a modified Raspberry Pi 5 under the hood, up to 8GB of on-board memory, a faster quad-core CPU, support for dual 4K displays via a pair of micro-HDMI ports, and more. Let’s take a look at the Pi 500, and see what it’s got under-the-hood. Regional Keyboard The Pi 500’s keyboard is available in the following regions: UK, and US. 1x USB 2.0 Port The inclusion of this legacy USB 2.0 port adds further compatibility with storage devices. 2x USB 3.0 Ports There are two fast USB 3.0 ports available on the rear of the Pi 500, so you can attach projects, as well as game controllers and other such devices. microSD Card Slot The microSD Card…

Up Close with Pi 500

The Pi 400 – Up Close

Inside the Pi 400 is a modified Raspberry Pi 4. It’s longer, spanning the width of the keyboard, with a large heatsink to dissipate enough heat for the overclocked processor. The Pi 4’s communication ports are spaced along the back of the Pi 400 keyboard, minus a second USB 2.0 port and a 3.5mm audio jack. 40-Pin GPIO The slightly recessed GPIO port is directly connected to the Pi 400 board inside the keyboard. This means you can still attach the usual Raspberry Pi HATs and other devices as you would a bare-metal Raspberry Pi. What’s Inside? This internal view shows the placement of the Pi board. microSD Card Slot The microSD Card Slot is where you’ll insert the card that contains the Raspberry Pi OS – or any other…

The Pi 400 – Up Close

Ten Pi 500 & Pi 400 Projects

EVERYONE LOVES PI We’ve put together ten possible projects that you could use your Pi 500 or your classic 400 with; that will entertain and keep you busy while helping you learn more about coding, the Pi and computing. RETRO COMPUTING With the Pi 400 being very similar to that of the great home computers of the 80s, we thought we’d start these ideas with a simple retro-themed project. Fuse is a ZX Spectrum emulator that’s available for the Raspberry Pi. Install it, and you can enjoy some of the greatest games ever created. STREAM PC GAMES It’s possible to stream any game installed on your powerful gaming PC to a Raspberry Pi. All you need is to ensure that your home network is up to scratch – use Ethernet…

Ten Pi 500 & Pi 400 Projects

The Pi Pico 2 – Up Close

The Pi Pico 2 may be small, but it packs a decent punch. With it you can expand your electronics projects, and incorporate a whole new level of functionality that you weren’t able to before with the traditional Raspberry Pi units. micro-USB B Port The Pi Pico’s micro-USB B provides both power, as well as communications between the Pico and a Raspberry Pi or other computer. Here you’ll be able to upload programs and projects on to your Pico. Boot Selection Switch The small button labelled BOOTSEL, Boot Selection, will switch the Pico between two start-up states enabling you to access the Pico as a storage device on your computer or Raspberry Pi. Memory & Storage The Pico 2 comes with 520KB on-chip SRAM memory, as well as 4MB Flash…

The Pi Pico 2 – Up Close

Pico Power: The Tiny Microcontroller

The Pico is something entirely different from the Raspberry Pi Foundation’s usual releases. Whereas the Raspberry Pi, now on version 4, is a small computer, and even the Compute Module and the Pi 400 are still just computers, the Pico is actually a microcontroller. A microcontroller is a processing unit that’s designed to work with programmable peripherals, and has input and output modules alongside a small amount of memory and storage capabilities. The processors are often scaled down, compared to the processor on a Raspberry Pi, or even inside your desktop computer, but powerful enough to complete basic tasks. Examples of a microcontroller in action can be found inside a washing machine, or traffic lights. A washing machine has no need for a quad-core processor, 8GB of memory, and the…

Pico Power: The Tiny Microcontroller

The Pico and MicroPython

The Pico uses MicroPython or C/C++ code in order to communicate with the devices it will be attached to. The code will, when uploaded to the Pico, run a specific set of instructions depending on the electronics that are soldered to the Pico. For example, in MicroPython, with an LED attached to the Pico, you would initialise and import the Pin and Timer modules, tell the Pico which GPIO the LED is attached to, then setup a routine that will use the Timer function to send a signal to the LED – let’s say every couple of seconds. The end result would be a blinking LED, which goes on and off every two seconds. Naturally, the more complex the electronics attached to the Pico are, then the more complex the…

The Pico and MicroPython

Pico Examples and How To

When you flash the Pico with the latest MicroPython the Pico will enter a wait state, waiting for instructions from you through MicroPython. You can easily start to upload a pre-created Python file, a. py file, on to the Pico’s storage, however, you can start to ‘talk’ to the Pico immediately via REPL. REPL, pronounced ‘ripple’, stands for Read, Evaluate, Print, Loop. Read means that MicroPython is waiting for you to enter code; Evaluate will interpret the code and begin to execute it; Print displays the results of the last executed line of code; Loop returns to the start, prompting you for more code. You can access the Pico via the command line, through a tool called Minicom, but since we’ve already got Thonny up and running, it makes sense…

Pico Examples and How To

Other SBCs to Use

An SBC, or Single-Board Computer, is a complete computer system that’s built on a single piece of circuit board; consisting of memory, storage and input and output ports. The Raspberry Pi is a prime example of a modern SBC, and the one that has easily become the most popular available in an increasingly crowded marketplace. However, there are a number of other SBCs available that vary in size, capacity, performance, price and expandability. Some of them are x86-based, which means they’re basically very small PCs on which you can install Windows 10; others utilise different makes of processor or microprocessors and offer a varied number of operating systems that will work on them, such as Android or Linux. While the Raspberry Pi is the SBC that offers some of the…

Other SBCs to Use

Raspberry Pi OS: The Complete Operating System

POWERING THE PI The Raspberry Pi OS OS has been powering the Raspberry Pi since its release back in 2013. At its core, Raspberry Pi OS is a Linux operating system, based on the hugely popular Debian flavour of Linux. Mike Thompson and Peter Green created Raspberry Pi OS in 2012, to work on the low-performance ARM CPUs found in the early Pi models. Toward the end of 2014, Raspberry Pi OS was further improved to work on the then new model Pi, the Raspberry Pi 2; utilising the 3.18 Linux kernel while still having Debian 7 (codenamed Wheezy) as the base. Mid-way through 2015, Raspberry Pi OS started using Debian 8 (Jessie) as the base, with kernels 4.1, 4.4, and 4.9. Kernel 4.9 was also used from 2017’s Raspberry…

Raspberry Pi OS: The Complete Operating System

Which Pi is Right for Me?

THE POWER OF PI With many different versions across four generations of models, the Raspberry Pi is certainly a busy little board. But while each Pi offers something slightly different, for the newcomer it’s a confusing medley of hardware specifications and model numbers. Which, Raspberry Pi hardware, then is going to be best for you? Naturally, that questions depends greatly on what it is you want to do with your Raspberry Pi. If you have a particular project in mind, such as a home media centre server, then you’d probably opt for the more powerful and hardware-capable model of Raspberry Pi. If you want to setup a wireless security camera project, using the Raspberry Pi as the core hardware, then perhaps the Pi Zero W would be a better fit.…

Which Pi is Right for Me?

Inital Kit You’ll Need and How to Set it Up

ASK AROUND The kit list required to set up a Raspberry Pi is pretty basic: keyboard, mouse, HDMI monitor, SD Card and an optional case. Many of these items you’ll already have, but don’t rush out and buy those you don’t. Ask around to see if anybody you know has spares. STEP 1 The most important thing you need is an SD Card. These are the storage cards commonly found in digital cameras. All modern Raspberry Pi boards, including the Raspberry Pi 3 and Pi Zero, use Micro SD cards but the older boards may use a larger SD Card. STEP 2 The SD Card plugs into the SD Card socket. On the Raspberry Pi 4, 3, and Pi Zero, you push the card in and pull it out. On…

Inital Kit You’ll Need and How to Set it Up

Set Up Raspberry Pi Using macOS

GETTING TO KNOW NOOBS The easiest way to get up and running is to use NOOBS, a software program created by the Raspberry Pi Foundation. You can buy a NOOBS SD Card from Raspberry Pi but it’s easy to make your own with an old unused SD Card (8GB recommended). STEP 1 We’re going to use a utility called SD Card Formatter 5 to erase the SD Card with correct formatting. You can download this app from https://www.sdcard.org/downloads/formatter_4/. Click Download SD Formatter for Mac and Accept. Click the SDFormatter.pkg file in your Downloads folder and follow the instructions to install the app. STEP 2 Use an SD Card of at least 8GB capacity to install the operating system on your Raspberry Pi. The card needs to be formatted, which will…

Set Up Raspberry Pi Using macOS

Set Up Raspberry Pi Using a Windows PC

SETTING UP WITH NOOBS NOOBS (New Out Of Box Software) is a program used to make setting up a Raspberry Pi simple. You can buy SD Cards with NOOBS preinstalled, but here we’ll look at how to format your SD Card and install NOOBS using a Windows computer. STEP 1 We’re going to use a utility called SD Card Formatter to erase the SD Card with correct formatting. You can download this app from https://www.sdcard.org/downloads/formatter/eula_windows/index.html. Click the Accept button to start the download of the latest version of the software. Extract the software, and double-click the executable to install and run the app. STEP 2 We’re going to use an 8GB SD Card to install the operating system on our Raspberry Pi. The card needs to be formatted, which will…

Set Up Raspberry Pi Using a Windows PC

Explore The Raspberry Pi OS

The Raspberry Pi OS operating system is a Linux distribution that comes pre-packed with a fantastic collection of programs and apps to help you get the most from your Pi. Raspberry Pi OS enables the Raspberry Pi to become a fully functioning desktop computer, and with it, you can code in the latest version of Python, C++ and more. There’s even an entire office suite for free, called LibreOffice, that’s Microsoft Office compatible if you install the Full Desktop version of Raspberry Pi OS. Raspberry Pi OS allows you to connect to your existing home network, surf the Internet, play music and videos, edit documents, send emails and much more. With a few simple tricks you can easily install more free software that, for instance enables you to edit images…

Explore The Raspberry Pi OS

Take a Tour of PIXEL

PIXEL PIXEL stands for “Pi Improved Xwindow Environment, Lightweight”. It’s a lightning fast and energy saving desktop that looks good too. It contains almost everything you’ll ever need to work with the Pi. THE DESKTOP The PIXEL interface is a module that’s installed on top of the core OS. It has seen some improvements over the years, and with the release of the Pi 4 and Raspberry Pi OS Buster, it now looks like this. THE PROGRAMS The programs that come pre-installed with Raspberry Pi OS are easily located by clicking on the Raspberry Pi logo in the upper left corner of the desktop. Once there, you can select from the sub-menu categories, followed by the program name. PRODUCTIVITY You’ll notice that within the Main menu, there’s a category named…

Take a Tour of PIXEL

Exploring the Command Line

USING TERMINAL Despite its graphical PIXEL interface, Raspberry Pi OS is a Linux operating system and this means you’ll spend a lot of time working with text commands. Using the command line is an important part of learning to use a Raspberry Pi computer. STEP 1 By default the Raspberry Pi boots directly into the PIXEL interface. Here you use a visual metaphor, files, buttons and so on, to make changes to your computer. The command line is where you control a computer by entering text commands. Click Terminal in the Menu bar to view the console. STEP 2 You can enter commands into the Terminal to make changes to the computer. This works alongside the PIXEL interface. Enter: mkdir Desktop/testfolder and press return. Notice a new folder appears below the…

Exploring the Command Line

Setting Up a Static IP Address

DHCP RESERVATION Now that you’ve set up your Raspberry Pi and connected it to the network, you should take time to fix its IP address. This will make it a lot easier for you to connect to the Raspberry Pi from a Mac or Windows computer and share files. STEP 1 When you connect your Raspberry Pi to a network, the router (or modem/router) assigns it a number, known as its IP (Internet Protocol) address. This is a block of four digits and the first three are usually 192.168.0. After that is a digit for each electronic device. STEP 2 The router typically takes the first address, so it is usually found at 192.168.0.1. That number is reserved for the router. Often you’ll find this number on your router marked…

Setting Up a Static IP Address

Connecting to the Pi Remotely

REMOTE CONTROL The Raspberry Pi is easy to set up and use in projects around the home and, surprisingly, many of these projects don’t need a keyboard, mouse or a monitor; these are known as Headless devices. VNC lets you control a Headless Pi from another computer. STEP 1 You will first need to ensure that your Pi is connected to a keyboard, mouse and monitor, and is connected to your Wi-Fi router, before you attempt to connect to it remotely. Start by clicking on the Raspberry Pi menu, then scroll down to Preferences > Raspberry Pi Configuration. STEP 2 With the Raspberry Pi Configuration window open, click on the Interfaces tab, and ensure that the VNC option is Enabled. Click on the radio button next to Enabled to activate,…

Connecting to the Pi Remotely

Using APT to Install and Remove Programs

ADVANCED PACKAGING TOOL Add/Remove Software is great for finding and installing software but most of the time you manage apps on a Raspberry Pi using a program called APT (Advanced Packaging Tool) using the apt command. STEP 1 To manage the apps on your Raspberry Pi you’ll need to use a tool included with Raspberry Pi OS called APT (Advanced Packaging Tool). APT is a command line tool so you need to either start your Raspberry Pi in the command line or click on the Terminal icon. STEP 2 The command used to control packages in Raspberry Pi OS is apt Type apt into the terminal and press Return to get a description of what the app does. The instructions tell us that the “most frequently used commands are update…

Using APT to Install and Remove Programs

Get More from the Terminal App

CUSTOM TERMINAL The Terminal gives you access to the command line, where the real power of the Linux OS lies. Getting used to the Terminal is key to mastering the Pi and your projects. STEP 1 Start Terminal by clicking the Terminal icon in the Application Launch Bar. You can also start Terminal by pressing Control-Alt-T or choosing Menu > Accessories > Terminal. Terminal emulates the old style video terminals from before desktop interfaces; so by default it displays bright (mostly green) on a black background. STEP 2 The first thing most people overlook is the ability to run multiple terminals at once in different tabs. Choose File > New Tab (Shift-Control-T) to create a new tab. Navigating multiple directories simultaneously can be a challenge in Terminal and tabs makes…

Get More from the Terminal App

Using the File Manager

VIEWING AND MOVING FILES You can move, manage and delete files using the Command Line but like all modern operating systems Raspberry Pi OS has a program to help you manage your files. Discover how to use the File Manager app. STEP 1 Raspberry Pi OS includes a great file management program called “File Manager PCManFM” or just “File Manager” for short. Click on the FileManager PCManFM icon in the Launch Bar or choose Menu > Accessories > File Manager. STEP 2 File Manager displays the folders in your Home folder (this should match your user name, ‘Pi’ by default). By default you should have Desktop, Documents, Downloads, Music, Pictures, Public, python_games, Scratch and folders. Double-click any folder to open it and view its contents. Click the Parent Folder icon…

Using the File Manager

Edit Images with GIMP

GETTO KNOW GIMP Your Raspberry Pi can display images with its built-in Image View app but for any image editing you’ll need GIMP (GNU Image Manipulation Program). GIMP is a powerful software package for photo editing and is a great tool to install on your Raspberry Pi. STEP 1 Open terminal and enter: sudo apt install gimp to download and install the GIMP package. An alert will appear saying: “after this operation, 117 MB of additional disk space will be used. Do you want to continue [Y/n]?” Enter: y and press Return. GIMP will now be installed in Raspberry Pi OS. GIMP is a lot larger than most programs you’ll install, so the installation takes longer. STEP 2 When the installation has completed you will find GIMP under Menu >…

Edit Images with GIMP

Python On The Raspberry Pi

Being able to code is part of making not just the Raspberry Pi, but all the connected devices that can access the Internet, do what you want them to. The Raspberry Pi is a perfect coding base that comes pre-installed with the latest version of one of the world’s most popular programming languages, Python. Python is a powerful yet easy to understand programming language that enables you to do anything, from displaying simple messages on the screen to producing action-packed arcade games. In this section of the book, you will learn how to get Python working and how to code your first Python program. Learning the tricks, hacks and fixes of Python will enable you to create something brilliant that can be shared with everyone who owns a Raspberry Pi.…

Python On The Raspberry Pi

Starting Python for the First Time

STARTING PYTHON For those using the Pi 4 and new Raspberry Pi OS, drop into a Terminal and enter: sudo apt-get install idle3. Older versions of Raspberry Pi OS already have the official Python IDLE pre-installed. STEP 1 With the Raspberry Pi OS desktop loaded, click on the Menu button followed by Programming > Python 3 (IDLE). This will open the Python 3 Shell. Windows and Mac users can find the Python 3 IDLE Shell from within the Windows Start button menu and via Finder. STEP 2 The Shell is where you can enter code and see the responses and output of code you’ve programmed into Python. This is a kind of sandbox, where you’re able to try out some simple code and processes. STEP 3 For example, in the Shell…

Starting Python for the First Time

Your First Code

PLAYING WITH PYTHON With most languages, computer or human, it’s all about remembering and applying the right words to the right situation. You’re not born knowing these words, so you need to learn them. STEP 1 If you’ve closed Python 3 IDLE, reopen it in whichever operating system version you prefer. In the Shell, enter the familiar following: STEP 2 Just as predicted, the word Hello appears in the Shell as blue text, indicating output from a string. It’s fairly straightforward and doesn’t require too much explanation. Now try: STEP 3 You can see that instead of the number 4, the output is the 2+2 you asked to be printed to the screen. The quotation marks are defining what’s being outputted to the IDLE Shell; to print the total of…

Your First Code

Saving and Executing Your Code

EDITING CODE You will eventually reach a point where you have to move on from inputting single lines of code into the Shell. Instead, the IDLE Editor will allow you to save and execute your Python code. STEP 1 First, open the Python IDLE Shell and when it’s up, click on File > New File. This will open a new window with Untitled as its name. This is the Python IDLE Editor and within it you can enter the code needed to create your future programs. STEP 2 The IDLE Editor is, for all intents and purposes, a simple text editor with Python features, colour coding and so on; much in the same vein as Sublime. You enter code as you would within the Shell, so taking an example from…

Saving and Executing Your Code

Executing Code from the Command Line

COMMAND THE CODE Using the code we created in the previous tutorial, the one we named hello.py, let’s see how you can run code that was made in the GUI at the command line level. STEP 1 Python, in Linux, comes with two possible ways of executing code via the command line. One of the ways is with Python 2, whilst the other uses the Python 3 libraries and so on. First though, drop into the command line or Terminal on your operating system. STEP 2 Just as before, we’re using a Raspberry Pi: Windows users will need to click the Start button and search for CMD, then click the Command Line returned search; and macOS users can get access to their command line by clicking Go > Utilities >…

Executing Code from the Command Line

Numbers and Expressions

IT’S ALL MATHS, MAN You can get some really impressive results with the mathematical powers of Python; as with most, if not all, programming languages, maths is the driving force behind the code. STEP 1 Open up the GUI version of Python 3, as mentioned you can use either the Shell or the Editor. For the time being, you’re going to use the Shell just to warm our maths muscle, which we believe is a small gland located at the back of the brain (or not). STEP 2 In the Shell enter the following: You can see that Python can handle some quite large numbers. STEP 3 You can use all the usual mathematical operations: divide, multiply, brackets and so on. Practise with a few, for example: STEP 4 You’ve…

Numbers and Expressions

#COMMENTS! Programmers use a method of keeping their code readable by commenting on certain sections. If a variable is used, the programmer comments on what it’s supposed to do, for example. It’s just good practise. STEP 1 Start by creating a new instance of the IDLE Editor (File > New File) and create a simple variable and print command: Save the file and execute the code. STEP 2 Running the code will return the line: The value of A is, 10 into the IDLE Shell window, which is what we expected. Now, add some of the types of comments you’d normally see within code: STEP 3 Resave the code and execute it. You can see that the output in the IDLE Shell is still the same as before, despite the…

Working with Variables

VARIOUS VARIABLES You’ll be working with the Python 3 IDLE Shell in this tutorial. If you haven’t already, open Python 3 or close down the previous IDLE Shell to clear up any old code. STEP 1 In some programming languages you’re required to use a dollar sign to denote a string, which is a variable made up of multiple characters, such as a name of a person. In Python this isn’t necessary. For example, in the Shell enter: name=”David Hayward” (or use your own name, unless you’re also called David Hayward). STEP 2 You can check the type of variable in use by issuing the type () command, placing the name of the variable inside the brackets. In our example, this would be: type (name). Add a new string variable:…

Working with Variables

USER FRIENDLY The type of input you want from the user will depend greatly on the type of program you’re coding. For example, a game may ask for a character’s name, whereas a database can ask for personal details. STEP 1 If it’s not already, open the Python 3 IDLE Shell, and start a New File in the Editor. Let’s begin with something really simple, enter: STEP 2 Save and execute the code, and as you already no doubt suspected, in the IDLE Shell the program will ask for your first name, storing it as the variable firstname, followed by your surname; also stored in its own variable (surname). STEP 3 Now that we have the user’s name stored in a couple of variables we can call them up whenever…

Creating Functions

FUNKY FUNCTIONS A function is a command that you enter into Python to do something. It’s a little piece of self-contained code that takes data, works on it and then returns the result. STEP 1 It’s not just data that a function works on. They can do all manner of useful things in Python, such as sort data, change items from one format to another and check the length or type of items. Basically, a function is a short word that’s followed by brackets. For example, len(), list() or type(). STEP 2 A function takes data, usually a variable, works on it depending on what the function is programmed to do and returns the end value. The data being worked on goes inside the brackets, so if you wanted to…

Creating Functions

Conditions and Loops

TRUE CONDITIONS Keeping conditions simple to begin with makes learning to program a more enjoyable experience. Let’s start then by checking if something is TRUE, then doing something else if it isn’t. STEP 1 Let’s create a new Python program that will ask the user to input a word, then check it to see if it’s a four-letter word or not. Start with File > New File, and begin with the input variable: STEP 2 Now we can create a new variable, then use the len function and pass the word variable through it to get the total number of letters the user has just entered: STEP 3 Now you can use an if statement to check if the word_length variable is equal to four and print a friendly conformation…

Conditions and Loops

MASTERING MODULES Think of modules as an extension that’s imported into your Python code to enhance and extend its capabilities. There are countless modules available and as we’ve seen, you can even make your own. STEP 1 Although good, the built-in functions within Python are limited. The use of modules, however, allows us to make more sophisticated programs. As you are aware, modules are Python scripts that are imported, such as import math. STEP 2 Some modules, especially on the Raspberry Pi, are included by default, the Math module being a prime example. Sadly, other modules aren’t always available. A good example on non-Pi platforms is the Pygame module, which contains many functions to help create games. Try: import pygame. STEP 3 The result is an error in the IDLE…

DEBUGGING Errors in code are called bugs and are perfectly normal. They can often be easily rectified with a little patience. The important thing is to keep looking, experimenting and testing. Eventually your code will be bug free. STEP 1 Code isn’t as fluid as the written word, no matter how good the programming language is. Python is certainly easier than most languages but even it is prone to some annoying bugs. The most common are typos by the user and whilst easy to find in simple dozen-line code, imagine having to debug multi-thousand line code. STEP 2 The most common of errors is the typo, as we’ve mentioned. The typos are often at the command level: mistyping the print command for example. However, they also occur when you have…

Python Graphics

GOING GRAPHICAL You can draw simple graphics, lines, squares and so on, or you can use one of the many Python modules available, to bring out some spectacular effects. STEP 1 One of the best graphical modules to begin learning Python graphics is Turtle. The Turtle module is, as the name suggests, based on the turtle robots used in many schools, that can be programmed to draw something on a large piece of paper on the floor. The Turtle module can be imported with: import turtle. STEP 2 Let’s begin by drawing a simple circle. Start a New File, then enter the following code: As usual press F5 to save the code and execute it. A new window will now open up and the ‘Turtle’ will draw a circle. STEP…

Python Graphics

Mastering Linux On Pi

The Raspberry Pi OS is Linux based, which is an incredibly powerful operating system that drives many supercomputers, web servers and even top-end military hardware. Get to grips with Linux, and you will not just master the Pi but also the power behind the Internet. In this section, you will discover how the OS works, how the filesystem is built and how you can list, move, create and delete files and folders. To truly be able to master the Raspberry Pi, you will need to be familiar with the OS and its inner-workings. The more adept you become at Linux, the better your projects will be, and the more power you’ll have over them and how they interact with the digital world to which they’re connected.…

Mastering Linux On Pi

Using the Filesystem

GETTING AROUND To drop into the Terminal, click on the fourth icon from the left along the top of the Raspberry Pi desktop, the one with a right-facing arrow and an underscore. This is the shell, or Terminal. STEP 1 First, you’re going to look at directories and the directory path. A directory is the same thing as a folder, however in Linux it’s always called a directory. These are placed inside each other using a “/” character. So when you see /home/pi it means the pi directory is inside the home directory. Enter: clear and press return to clean the screen. Now enter: pwd. This stands for Print Working Directory and displays /home/pi. STEP 2 When you log in to your Raspberry Pi, you don’t start at the base…

Using the Filesystem

Listing and Moving Files

LOOKING AT FILES Operating systems are built on files and folders, or directories if you prefer. While you’re used to viewing your own files, most operating systems keep other files out of sight. In Raspberry Pi OS, you have access to every file in the system. STEP 1 We’ve already looked at “ls”, which lists the files in the working directory, but you are more likely to use a command like “ls –l”. The bit after the command (the ‘-lah’) is known as the argument. This is an option that modifies the behaviour of the command. STEP 2 The “-l” argument lists files and directories in long format. Each file and directory is now on a single line, and before each file is a lot of text. First you’ll see…

Listing and Moving Files

Creating and Deleting Files

CREATING FILES Once you learn to recognise the files and directories that make up Raspberry Pi OS OS, it’s time to discover how to make your own. Knowing how to make, edit and delete files and directories is essential if you want to make your own projects. STEP 1 We’re going to create a file using a command called Touch. Touch is an interesting command that reaches out to a file, or directory, and updates it (this changes the system time as if you’d just opened the file). You can see Touch in access using “ls –l” and checking the time next to a directory (such as Scratch). STEP 2 Now enter: touch Scratch and ls –l again and notice that the time has changed. It now matches the current time.…

Creating and Deleting Files

Create and Remove Directories

MANAGING FILES AND DIRECTORIES Now that you know how to create files, you’ll want to learn how to make directories, which are the same thing as folders, as well as move items around. If you are more used to working with a desktop interface, this can take a bit of getting used to. STEP 1 Enter: ls to quickly view all the directories currently in in the home location. Directories are created using the “mkdir” command (make directory). Enter: mkdir testdir to create a new directory in your home directory. Enter: ls again to see it. STEP 2 The “mkdir” command is different to touch, in that it doesn’t update the timestamp if you use it with a directory that already exists. Enter: mkdir testdir again and you’ll get the…

Create and Remove Directories

Copying, Moving and Renaming Files

USING THE MOVE COMMAND In Linux, renaming a file is simply moving it from one name to another and copying a file is moving it without deleting the original. Don’t panic, it’s quite easy to master. STEP 1 Before we can move anything around, we need to have a few test items in our home directory. Enter: touch testfile and mkdir testdir to create a test file and test directory in your home directory. Enter: ls to check that they are both present. STEP 2 Files and directories are moved using the mv command. This is different to the commands we’ve looked at so far because it has two arguments (remember Linux command line is command, option, argument). The first argument is the source (the file or directory to be…

Copying, Moving and Renaming Files

Using the Man Pages

HEY, MAN! The man pages are one of the best features of Linux, and as a built-in tool it’s invaluable for both beginner and senior level Linux administrators. Let’s see how it works STEP 1 Linux has a built-in manual, known as man for short. Using the man command you can obtain information on all the Linux commands we’ve talked about. Simply enter: man and the name of the command you want to learn more about. Start by entering: man ls in the command line. STEP 2 The man pages are a bit more detailed than you might be used to. First you have a name, which tells you what the command is called; in this case “list directory contents” and then the synopsis shows you how it works. In…

Using the Man Pages

Editing Text Files

THE JOY OF TEXT You will come across a lot of text files in Linux and to be able to edit or create a text file, you need a good text editor. Linux has many but here are some in action on the Raspberry Pi. STEP 1 The first text editor for the Raspberry Pi is the default desktop environment app: Leafpad. To use, you can either double-click an existing text file or click the Raspberry Pi menu icon (in the top left of the desktop) and from the Accessories menu, choose Text Editor. STEP 2 From the Terminal there are even more options, although using the correct command, you can launch any of the desktop apps via the Terminal. One of the simplest, and a classic text editor that’s…

Editing Text Files

Getting to Know Users

WHAT IS A USER? An important part of using Linux is the concept of users and understanding which user you are and which group you belong to. Like all modern computers, you can have multiple user accounts with each having different levels of access. STEP 1 The first thing you need to do is get a concept of which user you are. Enter: whoami into the command line and press return. It should say “pi” (unless you set up your account name differently during setup). The “whoami” command might seem a bit simplistic, but it comes in very handy sometimes. STEP 2 When you are working in Linux, from time to time a ‘Permission denied’ error will occur, typically when you try to create, edit or execute (run) a file…

Getting to Know Users

Ownership and Permissions

OWNER AND PRIVILEGE Each user account in Linux is an owner of a section of the filesystem: their Home area. Within this area, they do what they like (within reason), as they have owner privileges. Elsewhere though, they usually just have read-only privileges. STEP 1 If you followed the previous tutorial you should now have two accounts on your Raspberry Pi. One called “pi” and the other with a name (Lucy in our case). An essential aspect of Linux is the idea of file and directory ownership; who owns, and has access, to what. You need a test file so enter: touch testfile. STEP 2 Now enter: ls –l and let’s have a good look at the default permissions file. Our testfile.txt files starts with the text “-rw-r--r—“. Start with the…

Ownership and Permissions

Useful System and Disk Commands

LOTS OF LINUX Linux is a huge and versatile command line language and there are hundreds of commands you can learn and use. Here are a few that can help you get more from your Raspberry Pi. STEP 1 The Raspberry Pi is a great little computer, so let’s start by getting some information. Enter: cat/proc/cpuinfo to view some details on your Raspberry Pi processors. If you have a Raspberry Pi 3 you will see four processors, along with the model name and other info. STEP 2 Remember that cat is used to list the contents of a text file, which is what cpuinfo is. There are other text files with system info available. Try “cat /proc/meminfo” to get information about your memory, “cat /proc/partitions” for information about your SD…

Useful System and Disk Commands

Managing Programs and Processes

PROGRAMS AND PROCESSES Linux has a trick up its sleeve when it comes to being able to manage programs and processes. When Windows closes a program, the allocated memory often isn’t freed up again. However, Linux is far more streamlined. STEP 1 As you get into Linux you’ll start to hear more about processes and another thing called the “kernel”. The kernel sits beneath the software and hardware. It passes instructions to the hardware running processes, which takes up memory, and when the process is finished it closes it and reclaims the memory. STEP 2 You’re probably used to thinking in terms of programs and most OS’s tend to keep processes out of sight. In Linux on the other hand, you’re right in at the deep end. A process is…

Managing Programs and Processes

Input, Output and Pipes

IN, OUT, LINUX ALL ABOUT Everything on a computer is about input and output. You input things into the computer (press keys, move the mouse) and it makes calculations and outputs content (changes the display, makes a noise, for example). STEP 1 When you enter commands into Linux (in the command line), you are using standard input and output. This is so obvious that most people don’t even think about it. You enter commands using the keyboard (that’s input) and it responds to the screen (output). This is the regular way of doing it, which is why it’s “standard input and output” (often called “stdin” and “stdout” for short). STEP 2 As far as the computer is concerned, input and output can be to and from a whole range of…

Input, Output and Pipes

Command Line Quick Reference

TOP 10 COMMANDS These may not be the most common commands used by everyone but they will certainly feature frequently for many users of Linux and the command line. cd The ‘cd’ command is one of the commands you will use the most at the command line in Linux. It allows you to change your working directory. You use it to move around within the hierarchy of your file system. You can also use chdir. ls The ‘ls’ command shows you the files in your current directory. Used with certain options, it lets you see file sizes, when files where created and file permissions. For example, ls ~ shows you the files that are in your home directory. cp The ‘cp’ command is used to make copies of files and…

Command Line Quick Reference

Raspberry Pi Projects

The Raspberry Pi is all about projects. We’ve seen the Pi attached to a satellite taking high-resolution images of the Earth, as well as by scientists monitoring habitats in some of the most extreme places on the planet. And enthusiasts the world over have used a Raspberry Pi as the driving force of their unique projects. Want to use the Pi to see where the International Space Station is? How about creating a retro coding system, or a media centre, or even connecting to a Bulletin Board System? You’ll find these projects and more in this section. Where next is up to you. Let your imagination fly with the Raspberry Pi.…

Raspberry Pi Projects

Creating a Loading Screen

LOAD”” Back in the 80s, in the 8-bit home computing era, loading screens were often used to display the cover of a game as it loaded from tape. The image would load itself in, usually one-line-at-a-time, then proceed to colour itself in while the loading raster bars danced around in the borders of the screen. Loading screens were a part of the package and often the buy-in for the whole game as an experience. Some loading screens featured animations, or a countdown for time remaining as the game loads, while others even went so far as to include some kind of playable game. The point being: a loading screen is not just an artistic part of computing history, but an introduction to the program that’s about to be run. While…

Creating a Loading Screen

Tracking the ISS with Pi

TO BOLDLY GO… Indeed, the ISS is something most of us consider as a worthy example of what can happen when we work together. NASA, among other agencies, uses a wealth of Python code onboard the ISS to help automate routines, alongside its function as an in-between link to translate code from one language to another, and then into a human-readable format. If you’re considering a career in space, then learning Python is a must-have skill. While we’re not able to fill you in on all the details regarding the code the ISS utilises, we can look at a fun Python script that will track the ISS, display the number of astronauts on board, and update the station’s current latitude and longitude every five seconds, while also displaying your current…

Tracking the ISS with Pi

Text Animations

THE FINAL COUNTDOWN Let’s begin with some example code that will display a large countdown from ten, then clear the screen and display a message. The code itself is quite simple, but lengthy. You will need to start by importing the OS and Time modules, then start creating functions that display the numbers (see image below) and so on to 10. It’ll take some time, but it’s worth it in the end. Of course, you can always take a different approach and design the numbers yourself. The next step of the process is to initialise the code settings and start the countdown: And finally, we can add a display for the message: The code in its entirety can be viewed from within our Code Repository: https://pclpublications.com/exclusives, where you’re free to…

Text Animations

THE GOLDEN ERA OF CODE While it may seem a little counterproductive to learn how to code in a language that’s virtually obsolete, there are some surprising benefits to getting your hands dirty with a bit of retro coding. Firstly, learning old code will help you build the structure of code as, regardless of whether it is a language that was developed yesterday, or forty years ago, code still demands strict discipline to work correctly. Secondly, everyday coding elements, such as loops, sub routines and so on, are a great visual aid to learn in older code, especially BASIC. Lastly, it’s simply good fun. GOING BASIC The easiest retro language to play around with is, without doubt, BASIC. Developed back in the mid-sixties, BASIC (Beginner’s All-Purpose Symbolic Instruction Code) is…

Using Text Files for Animation

ASCII ANIMATION Let’s assume you wanted to create an animated ASCII Happy Birthday Python script, with the words Happy and Birthday alternating in appearance. Here’s how it’s done. STEP 1 First we need to create some ASCII-like text, head over to http://patorjk.com/software/taag. This is an online Text to ASCII generator, created by Patrick Gillespie. Start by entering Happy into the text box, the result will be displayed in the main window. You can change the font with the drop-down menu to the side of the text box; we’ve opted for Big. STEP 2 Now, on your computer create a folder in your Python code directory (call it Test, for now) and open either Leafpad for the Raspberry Pi or, if you’re using Windows 10, then Notepad. Click on the Select…

Using Text Files for Animation

Pi Projects: Desktop Pi

COMPUTER PI First and foremost, the Raspberry Pi is a computer. It has an operating system, built-in productivity apps, the ability to connect to both a home network and the Internet (either wirelessly or through Ethernet), and you can connect a mouse, keyboard, and monitor. It stands to reason, then, that it makes for a remarkably cheap desktop computer. The obvious advantage of using the Raspberry Pi as a desktop computer though, is the fact that it’s so cheap. For around £100 you could easily purchase the Pi, monitor, keyboard and mouse, providing you with a fully-functional computer capable of doing most, if not all, of the things you would do on a computer that costs ten times that amount. However, there are ways in which you can further enhance…

Pi Projects: Desktop Pi

Pi Projects: BBS Client

WARGAMES If you’re old enough to recall, or have since watched, the excellent movie Wargames, then you’ll be roughly familiar with the way in which a Bulletin Board System works; and if you haven’t watched Wargames, then we recommend you get hold of it. In the movie, the young protagonist spends his days at the keyboard of his early 80s computer, using his modem to dial into remote systems. Once inside these remote systems, he then goes about traversing the remote host’s file system looking for anything interesting. The movie plot aside, this, essentially, is how a BBS works. It’s a remote computer that runs specialist BBS server software with a mix of content either pre-installed, or added by the system admin (sysadmin or sysop). A user of the BBS…

Pi Projects: BBS Client

Pi Projects: Weather Station

IT’S RAINING PI, HALLELUJAH! Weather stations have been available to the project-minded public since long before the Raspberry Pi entered the scene, but thanks to the Pi’s unique specifications, a new generation of weather station has emerged; and they’re really quite remarkable. As with a lot of Raspberry Pi projects, the market has become flooded with various hardware, kits, and HATs that will enable you to set up a simple, or complex, weather station. The more experienced weather station and Raspberry Pi user will probably lean toward buying in the components individually, as opposed to an entire kit, but for the rest of us the kit-form versions are an excellent start to a project that can quickly grow over time. WHY? With our smart devices connected to everything around us…

Pi Projects: Weather Station

Stream Digital TV with Raspberry Pi

TV HAT In this tutorial, we’re using the Raspberry Pi TV HAT as sold by The Pi Hut (https://thepihut.com/products/raspberry-pi-tv-hat?variant=13539182673982). It’s a Sony CXD2880 TV Tuner supporting DVB-T and 2nd-gen DVB-T2 standards. STEP 1 The Raspberry Pi TV HAT is compatible with the Pi Zero, Pi 3 A+ and B+ models. The kit comes with everything you need to connect the HAT to your RPi, including spacers, screws and the 40-pin header. Begin by opening the box and spreading the contents out on a clear area. STEP 2 Start by connecting the 40-pin header to the 40-pin GPIO on top of your Raspberry Pi. Now take the spacers and screws and fit them to the corresponding holes in the corners of the main Raspberry Pi and the TV HAT; use three…

Stream Digital TV with Raspberry Pi

The Best AI Coding Tools For Raspberry Pi

Modern artificial intelligence (AI) coding tools go much further than checking your syntax, and helping you debug your programs. AI tools can analyse your entire code, offer suggestions of what to do next, work out where your program should go next and more. Don’t expect them to replace a good coder – they won’t write your code for you. But clever use of AI tools can greatly reduce the time it takes to complete your programs, by identifying problems so you can nip them in the bud and producing coding solutions that would take a human coder hours to write. But what are these tools? GITHUB COPILOT From free, https://github.com/features/copilot If you’re scratching your head wondering what to do next with your program, you can ask GitHub Copilot a question.…

The Best AI Coding Tools For Raspberry Pi

Common Raspberry Pi Problems

TROUBLESHOOTING YOUR RPI The Raspberry Pi is a surprisingly stable bit of kit, but there is always the chance of encountering problems. If you’re really stuck there are apps available which can help diagnose problems on the RPi. RED POWER LED IS BLINKING A blinking red power LED indicates problems with the power supply. On model A and B, it is hard-wired to the 3.3V power supply rail. If it is blinking, it means the 5V power supply is dropping out. Use a different power supply. On the model B+ and also the A+, the circuit has been improved to give a much more reliable warning of poor power quality. The red power LED is wired to an APX803 supervisor which kicks in when the 5V power supply drops below…

Common Raspberry Pi Problems

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