Acknowledgments...xvi Introduction... xvii Primer Project 1: Blinking an LED Project 2: Pushbutton LED Flashlight...

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1 Contents Acknowledgments...xvi Introduction... xvii Primer... 2 LEDs Project 1: Blinking an LED Project 2: Pushbutton LED Flashlight Project 3: LED Dimmer Switch Project 4: A Graphical User Interface for a Multicolor LED...61 Project 5: Rainbow Light Strip displays Project 6: An LCD Reminder Project 7: Mini Weather Forecaster Project 8: Pong with a Sense HAT sensors Project 9: All-in-One Weather Sensor Station Project 10: Intruder Alarm with Notifications Project 11: Gas and Smoke Alarm Project 12: Temperature and Humidity Data Logger vi Contents

2 Cameras Project 13: Burglar Detector with Photo Capture Project 14: Home Surveillance Camera web applications Project 15: Building Your First Website Project 16: Connecting Your Electronics to the Web Project 17: Internet of Things Control Center with Node-RED Games and Toys Project 18: digital drum set Project 19: Make a Game in Scratch: Hungry Monkey Project 20: Wi-Fi Remote-Controlled Robot Raspberry Pi GPIO Pin Guide Decoding Resistor Values vii Contents

3 Contents in Detail Acknowledgments...xvi Introduction...xvii Who Is This Book For?... xvii About This Book... xiii What Do You Need for This Book?... xiii Organization of This Book...xix Primer...2 Getting started with the Raspberry Pi... 3 Uses for the Raspberry Pi... 4 Differentiating Between Boards... 5 Getting to Know the Raspberry Pi and Its Accessories... 6 Project Component List... 9 Uploading the Operating System...10 Downloading NOOBS...10 Formatting a microsd card on Windows or macos Formatting a microsd card on Linux...12 Loading Raspbian onto the microsd Card...14 Setting Up Your Raspberry Pi as a Desktop Computer...14 Connecting your Raspberry Pi...14 Booting Up Your Pi for the First Time...16 Desktop Tour...18 Shutting Down, Rebooting, and Logging Off Getting Started with Python Python 3 Integrated Development Environment Basic Python Instructions The Python Editor Your First Python Program Making a Simple Calculator...31 viii Contents in Detail

4 LEDs Project 1: Blinking an LED Introducing the GPIO pins Introducing LEDs Finding the Right Resistor Wiring the Circuit...41 Writing the Script Entering the Script Running the Script Taking It Further Project 2: Pushbutton LED Flashlight Introducing Switches and Buttons Wiring the Circuit Writing the Script Taking It Further...51 Project 3: LED Dimmer Switch...52 Introducing Potentiometers Reading Analog Signals with Raspberry Pi Analog-to-Digital Converters Pulse-Width Modulation Wiring the Circuit Writing the Script Entering the Script Running the Script Taking It Further Project 4: A Graphical User Interface for a Multicolor LED Introducing RGB LEDs Wiring the Circuit ix Contents in Detail

5 Writing the Script Controlling the Intensity and Closing the Window Designing the User Interface with Tkinter Running the Script Taking It Further Project 5: Rainbow Light Strip Introducing the WS2812B Addressable RGB LED Strip Introducing the Logic Level Converter Wiring the Circuit Writing the Script Installing the WS281X Library Enabling SPI Communication Entering the Script Running the Script...81 Taking It Further displays Project 6: An LCD Reminder Introducing the Liquid Crystal Display Soldering the Headers The LCD Module Pinout Wiring Your Circuit Writing the Script Installing the Python Library for a Character LCD Displaying a Character Message Adding Other Functionality...91 Scrolling a Reminder Message Running the Script Taking It Further Project 7: Mini Weather Forecaster Introducing the OLED Display Using the OpenWeatherMap API Understanding JSON Syntax Making an API Request x Contents in Detail

6 Wiring the Circuit Writing the Script Installing the Library for the OLED Display Enabling I 2 C Communication Entering the Script Running the script Taking It Further Project 8: Pong with a Sense HAT Introducing Pong Introducing the Raspberry Pi Sense HAT Mounting the Board Using the Sense HAT Emulator Working with Sense HAT Functions and Controls Controlling the LED Matrix Reading Data from the Joystick Writing the Script Entering the Script Running the Script Taking It Further sensors Project 9: All-in-One Weather Sensor Station The Sense HAT as a Weather Station The Temperature Sensor The Humidity Sensor The Barometric Pressure Sensor Reading Temperature, Humidity, and Pressure Building a User Interface for Your Readings Writing the Script Creating the User Interface Automatically Updating the Readings Running the Script Taking It Further xi Contents in Detail

7 Project 10: Intruder Alarm with Notifications Introducing the PIR Motion Sensor Sending an with Python Finding Your SMTP Server Details The -Sending Script Running the -Sending Script Wiring the Circuit Writing the Script Taking it Further Project 11: Gas and Smoke Alarm Introducing the MQ-2 Gas and Smoke Sensor Introducing the Piezo Buzzer Wiring the Circuit Writing the Script Setting the Threshold Value Running the Script Taking It Further Project 12: Temperature and Humidity Data Logger Introducing the DHT22 Sensor Wiring the Circuit Writing the Script Installing the DHT22 Library Entering the Script Creating, Writing, and Closing.txt files Running the Script Taking It Further Cameras Project 13: Burglar Detector with Photo Capture Introducing the Raspberry Pi Camera Module v Building the Burglar Detector Enabling the Camera Connecting the Camera Wiring the Circuit xii Contents in Detail

8 Writing the Script Entering the Script Running the Script Taking It Further Project 14: Home Surveillance Camera Recording Video to a File Writing the Script Entering the Script Running the Script Taking It Further web applications Project 15: Building Your First Website Setting Up the Project Files Setting Up an HTML Web Page Setting Up the Basic Content Adding the Title, Headings, and Paragraphs Seeing Your Web Page Adding Links, Images, and Buttons Styling Your Page with CSS Embedding a Style Sheet Styling Your HTML Content Styling the Header Styling the title Class Styling the Headings, Paragraphs, and Links Styling the Button Taking It Further Project 16: Connecting Your Electronics to the Web Introducing Web Servers Introducing the Relay Module Relay Pinout Relay Usage Project Overview Wiring the Circuit Preparing Your Pi to Run a Web Server Installing Flask Organizing Your Files xiii Contents in Detail

9 Writing the ScriptS Creating the Web Server Writing the HTML File Writing the CSS File Launching Your Web Server Taking It Further Project 17: Internet of Things Control Center with Node-RED Introducing Node-RED Installing the DHT22 Nodes Getting Started with Node-RED Wiring the Circuit Creating the Flow Creating the Dashboard User Interface Wiring the Nodes Running Your Application Taking It Further Games and Toys Project 18: digital drum set Preparing the Audio Configuring the Audio Getting the Audio Sample Files Wiring the Circuit Writing the Script Taking It Further Project 19: Make a Game in Scratch: Hungry Monkey Introducing Scratch Wiring the Circuit Building the Script Creating the Sprites and Choosing the Stage Background Editing the Sprites Adding Controls to the Monkey Sprite Testing Your Script Creating the Countdown Timer Counting and Displaying the Score xiv Contents in Detail

10 Making the Bananas Fall from the Sky Adding the Rotten Bananas Playing the Game Taking It Further Project 20: Wi-Fi Remote-Controlled Robot Project Outline Preparing the Raspberry Pi Wiring the Circuit Wiring the DC Motors to MotoZero Controlling the Motors with MotoZero Writing the Application Finding the Raspberry Pi IP Address Creating the Node-RED Flow Entering the Script Running the Application Powering Up the Robot Taking It Further Raspberry Pi GPIO Pin Guide Decoding Resistor Values xv Contents in Detail