book

Raspberry Pi Cookbook, 3rd Edition

by Simon Monk

October 2019

Beginner to intermediate

608 pages

11h 41m

English

O'Reilly Media, Inc.

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Using This BookConventions Used in This BookUsing Code ExamplesO’Reilly Online LearningHow to Contact UsAcknowledgments
1.0. Introduction1.1. Selecting a Model of Raspberry Pi1.2. Connecting the System1.3. Enclosing a Raspberry Pi1.4. Selecting a Power Supply1.5. Selecting an Operating System1.6. Writing a microSD Card with NOOBS1.7. Installing an Operating System Without NOOBS1.8. Using PiBakery to Configure and Write an SD Card1.9. Using PiBakery to Configure a Headless Raspberry Pi1.10. Booting from a Real Hard Disk or USB Flash Drive1.11. Connecting a DVI or VGA Monitor1.12. Using a Composite Video Monitor/TV1.13. Adjusting the Picture Size on Your Monitor1.14. Maximizing Performance1.15. Changing Your Password1.16. Shutting Down Your Raspberry Pi1.17. Installing the Raspberry Pi Camera Module1.18. Using Bluetooth
2.0. Introduction2.1. Connecting to a Wired Network2.2. Finding Your IP Address2.3. Setting a Static IP Address2.4. Setting the Network Name of a Raspberry Pi2.5. Setting Up a Wireless Connection2.6. Connecting with a Console Lead2.7. Controlling the Pi Remotely with SSH2.8. Controlling the Pi Remotely with VNC2.9. Controlling the Pi Remotely Using RDP2.10. File Sharing on a Mac Network2.11. Using a Raspberry Pi for Network Attached Storage2.12. Network Printing
3.0. Introduction3.1. Browsing Files Graphically3.2. Copying Files onto a USB Flash Drive3.3. Starting a Terminal Session3.4. Navigating the Filesystem Using a Terminal3.5. Copying a File or Folder3.6. Renaming a File or Folder3.7. Editing a File3.8. Viewing the Contents of a File3.9. Creating a File Without Using an Editor3.10. Creating a Directory3.11. Deleting a File or Directory3.12. Performing Tasks with Superuser Privileges3.13. Understanding File Permissions3.14. Changing File Permissions3.15. Changing File Ownership3.16. Making a Screen Capture3.17. Installing Software with apt-get3.18. Removing Software Installed with apt-get3.19. Installing Python Packages with Pip3.20. Fetching Files from the Command Line3.21. Fetching Source Code with Git3.22. Fetching This Book’s Accompanying Code3.23. Running a Program or Script Automatically on Startup3.24. Running a Program or Script Automatically as a Service3.25. Running a Program or Script Automatically at Regular Intervals3.26. Finding Things3.27. Using the Command-Line History3.28. Monitoring Processor Activity3.29. Working with File Archives3.30. Listing Connected USB Devices3.31. Redirecting Output from the Command Line to a File3.32. Concatenating Files3.33. Using Pipes3.34. Hiding Output to the Terminal3.35. Running Programs in the Background3.36. Creating Command Aliases3.37. Setting the Date and Time3.38. Finding Out How Much Room You Have on the SD Card3.39. Find Out What Operating System Version You Are Running3.40. Updating Raspbian
4.0. Introduction4.1. Making a Media Center4.2. Using Office Software4.3. Making a Webcam Server4.4. Running a Vintage Game Console Emulator4.5. Running Minecraft: Pi Edition4.6. Raspberry Pi Radio Transmitter4.7. Editing Bitmap Images4.8. Editing Vector Images4.9. Internet Radio
5.0. Introduction5.1. Deciding Between Python 2 and Python 35.2. Editing Python Programs with Mu5.3. Using the Python Console5.4. Running Python Programs from the Terminal5.5. Assigning Names to Values (Variables)5.6. Displaying Output5.7. Reading User Input5.8. Arithmetic5.9. Creating Strings5.10. Concatenating (Joining) Strings5.11. Converting Numbers into Strings5.12. Converting Strings into Numbers5.13. Finding the Length of a String5.14. Finding the Position of One String Within Another5.15. Extracting Part of a String5.16. Replacing One String of Characters with Another Within a String5.17. Converting a String to Uppercase or Lowercase5.18. Running Commands Conditionally5.19. Comparing Values5.20. Logical Operators5.21. Repeating Instructions an Exact Number of Times5.22. Repeating Instructions Until Some Condition Changes5.23. Breaking Out of a Loop5.24. Defining a Function in Python
6.0. Introduction6.1. Creating a List6.2. Accessing Elements of a List6.3. Finding the Length of a List6.4. Adding Elements to a List6.5. Removing Elements from a List6.6. Creating a List by Parsing a String6.7. Iterating Over a List6.8. Enumerating a List6.9. Sorting a List6.10. Cutting Up a List6.11. Applying a Function to a List6.12. Creating a Dictionary6.13. Accessing a Dictionary6.14. Removing Entries from a Dictionary6.15. Iterating Over Dictionaries
7.0. Introduction7.1. Formatting Numbers7.2. Formatting Dates and Times7.3. Returning More Than One Value7.4. Defining a Class7.5. Defining a Method7.6. Inheritance7.7. Writing to a File7.8. Reading from a File7.9. Pickling7.10. Handling Exceptions7.11. Using Modules7.12. Random Numbers7.13. Making Web Requests from Python7.14. Command-Line Arguments in Python7.15. Running Linux Commands from Python7.16. Sending Email from Python7.17. Writing a Simple Web Server in Python7.18. Doing Nothing in Python7.19. Doing More Than One Thing at a Time7.20. Using Python with Minecraft: Pi Edition7.21. Parsing JSON7.22. Creating User Interfaces7.23. Using Regular Expressions to Search for Patterns in Text7.24. Using Regular Expressions to Validate Data Entry7.25. Using Regular Expressions for Web Scraping
8.0. Introduction8.1. Installing OpenCV8.2. Setting Up a USB Camera for Computer Vision8.3. Using a Raspberry Pi Camera Module for Computer Vision8.4. Counting Coins8.5. Face Detection8.6. Motion Detection8.7. Optical Character Recognition
9.0. Introduction9.1. Finding Your Way Around the GPIO Connector9.2. Keeping Your Raspberry Pi Safe When Using the GPIO Connector9.3. Setting Up I2C9.4. Using I2C Tools9.5. Setting Up SPI9.6. Installing PySerial for Access to the Serial Port from Python9.7. Installing Minicom to Test the Serial Port9.8. Using a Breadboard with Jumper Leads9.9. Using a Breadboard with a Pi Cobbler9.10. Using a Raspberry Squid9.11. Using a Raspberry Squid Button9.12. Converting 5V Signals to 3.3V with Two Resistors9.13. Converting 5V Signals to 3.3V with a Level Converter Module9.14. Powering a Raspberry Pi with Batteries9.15. Powering a Raspberry Pi with a LiPo Battery9.16. Getting Started with the Sense HAT9.17. Getting Started with the Explorer HAT Pro9.18. Getting Started with a RasPiRobot Board9.19. Using a Pi Plate Prototyping Board9.20. Making a HAT9.21. The Pi Zero and Pi Zero W

10.0. Introduction10.1. Connecting an LED10.2. Leaving the GPIO Pins in a Safe State10.3. Controlling the Brightness of an LED10.4. Switching a High-Power DC Device Using a Transistor10.5. Switching a High-Power Device Using a Relay10.6. Controlling High-Voltage AC Devices10.7. Controlling Hardware with Android and Bluetooth10.8. Making a User Interface to Turn Things On and Off10.9. Making a User Interface to Control PWM Power for LEDs and Motors10.10. Changing the Color of an RGB LED10.11. Using an Analog Meter as a Display
11.0. Introduction11.1. Controlling Servo Motors11.2. Controlling Servo Motors Precisely11.3. Controlling Multiple Servo Motors Precisely11.4. Controlling the Speed of a DC Motor11.5. Controlling the Direction of a DC Motor11.6. Using a Unipolar Stepper Motor11.7. Using a Bipolar Stepper Motor11.8. Using a Stepper Motor HAT to Drive a Bipolar Stepper Motor11.9. Using a RasPiRobot Board to Drive a Bipolar Stepper Motor11.10. Building a Simple Robot Rover
12.0. Introduction12.1. Connecting a Push Switch12.2. Toggling with a Push Switch12.3. Using a Two-Position Toggle or Slide Switch12.4. Using a Center-Off Toggle or Slide Switch12.5. Debouncing a Button Press12.6. Using an External Pull-Up Resistor12.7. Using a Rotary (Quadrature) Encoder12.8. Using a Keypad12.9. Detecting Movement12.10. Adding GPS to the Raspberry Pi12.11. Intercepting Keypresses12.12. Intercepting Mouse Movements12.13. Using a Real-Time Clock Module12.14. Giving the Raspberry Pi a Reset Button
13.0. Introduction13.1. Using Resistive Sensors13.2. Measuring Light13.3. Measuring Temperature with a Thermistor13.4. Detecting Methane13.5. Measuring CO2 Concentration13.6. Measuring a Voltage13.7. Reducing Voltages for Measurement13.8. Using Resistive Sensors with an ADC13.9. Measuring Temperature with an ADC13.10. Measuring the Raspberry Pi CPU Temperature13.11. Measuring Temperature, Humidity, and Pressure with a Sense HAT13.12. Measuring Temperature Using a Digital Sensor13.13. Measuring Acceleration with an MMA8452Q Module13.14. Finding Magnetic North with the Sense HAT13.15. Using the Inertial Management Unit of the Sense HAT13.16. Sensing a Magnet with a Reed Switch13.17. Sensing a Magnet with the Sense HAT13.18. Measuring Distance Using Ultrasound13.19. Measuring Distance Using a Time-of-Flight Sensor13.20. Capacitive Touch Sensing13.21. Reading Smart Cards with an RFID Reader/Writer13.22. Displaying Sensor Values13.23. Logging to a USB Flash Drive
14.0. Introduction14.1. Using a Four-Digit LED Display14.2. Displaying Messages on an I2C LED Matrix14.3. Using the Sense HAT LED Matrix Display14.4. Displaying Messages on an Alphanumeric LCD HAT14.5. Using an OLED Graphical Display14.6. Using Addressable RGB LED Strips14.7. Using the Pimoroni Unicorn HAT14.8. Using an ePaper Display
15.0. Introduction15.1. Connecting a Loudspeaker15.2. Controlling Where Sound Is Output15.3. Playing Sound from the Command Line15.4. Playing Sound from Python15.5. Using a USB Microphone15.6. Making a Buzzing Sound
16.0. Introduction16.1. Controlling GPIO Outputs Using a Web Interface16.2. Displaying Sensor Readings on a Web Page16.3. Getting Started with Node-RED16.4. Sending Email and Other Notifications with IFTTT16.5. Sending Tweets Using ThingSpeak16.6. CheerLights16.7. Sending Sensor Data to ThingSpeak16.8. Responding to Tweets Using Dweet and IFTTT
17.0. Introduction17.1. Making a Raspberry Pi into a Message Broker with Mosquitto17.2. Using Node-RED with an MQTT Server17.3. Flashing a Sonoff WiFi Smart Switch for MQTT Use17.4. Configuring a Sonoff WiFi Smart Switch17.5. Using Sonoff Web Switches with MQTT17.6. Using Flashed Sonoff Switches with Node-RED17.7. The Node-RED Dashboard17.8. Scheduled Events with Node-RED17.9. Publishing MQTT Messages from a Wemos D117.10. Using a Wemos D1 with Node-RED
18.0. Introduction18.1. Programming an Arduino from Raspberry Pi18.2. Communicating with an Arduino by Using the Serial Monitor18.3. Setting Up PyFirmata to Control an Arduino from a Raspberry Pi18.4. Writing Digital Outputs on an Arduino from a Raspberry Pi18.5. Using PyFirmata with TTL Serial18.6. Reading Arduino Digital Inputs Using PyFirmata18.7. Reading Arduino Analog Inputs Using PyFirmata18.8. Analog Outputs (PWM) with PyFirmata18.9. Controlling a Servo Using PyFirmata18.10. Using Small Arduino Boards with a Raspberry Pi18.11. Using Small WiFi-Enabled Arduino-Compatibles (ESP8266)
PartsPrototyping Equipment and KitsResistors and CapacitorsTransistors and DiodesIntegrated CircuitsOpto-ElectronicsModulesMiscellaneous
Raspberry Pi 4/3/2 model B, B+, A+, ZeroRaspberry Pi model B revision 2, ARaspberry Pi model B revision 1

Content preview from Raspberry Pi Cookbook, 3rd Edition

Chapter 14. Displays

14.0 Introduction

Although the Raspberry Pi can use a monitor or TV as a display, it is often nice to use a smaller, more specialized display with it. In this chapter, we explore a range of different displays that can be attached to a Raspberry Pi.

Some of the recipes require the use of a solderless breadboard and male-to-female jumper wires (see Recipe 9.8).

14.1 Using a Four-Digit LED Display

Note

Be sure to check out the accompanying video for this recipe at http://razzpisampler.oreilly.com.

Problem

You want to display a four-digit number in an old-fashioned, seven-segment LED display.

Solution

Attach an Inter-Integrated Circuit (I2C) LED module, such as the model shown in Figure 14-1, to a Raspberry Pi using female-to-female jumper wires.

To make this recipe, you will need the following:

Four female-to-female jumper wires (see “Prototyping Equipment and Kits”)
Adafruit 4×7-segment LED with I2C backpack (see “Modules”)

The connections between the Raspberry Pi and the module are as follows:

VCC (+) on the display to 5V on the Raspberry Pi general-purpose input/output (GPIO) connector
GND (-) on the display to GND on the Raspberry Pi GPIO connector
SDA (D) on the display to GPIO 2 (SDA) on the Raspberry Pi GPIO connector
SCL (C) on the display to GPIO 3 (SCL) on the Raspberry Pi GPIO ...