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Introduction to Raspberry Pi and Linux

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A workshop I conducted to introduce the basics of setting up the Raspberry Pi using Raspbian, learning basic Linux commands and the use of GPIO pins. The code and schematics used in this presentation can be found in this Github repository https://github.com/yeokm1/intro-to-rpi .

Published in: Devices & Hardware
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Introduction to Raspberry Pi and Linux

  1. 1. Introduction to Raspberry Pi and Linux workshop By: Yeo Kheng Meng (yeokm1@gmail.com) https://github.com/yeokm1/intro-to-rpi At SUTD 14 March 2015
  2. 2. Components check • Raspberry Pi Model B • Micro-SD card • Micro-USB cable ( with power adapter) • Small Breadboard • LED • Push button • 220-ohm Resistor • 4 male-female jumper wires • LAN cable
  3. 3. Download SSH client • Windows: Download Putty • Linux/Mac: Includes SSH client by default
  4. 4. About me • Year 4 NUS Computer Science student • My Hardware projects with Arduino and Raspberry Pi
  5. 5. What is a Raspberry Pi (RPi)? • “The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. It is a capable little device that enables people of all ages to explore computing, and to learn how to program in languages like Scratch and Python. It’s capable of doing everything you’d expect a desktop computer to do, from browsing the internet and playing high-definition video, to making spreadsheets, word-processing, and playing games.” http://www.raspberrypi.org/help/what-is-a-raspberry-pi/
  6. 6. Common Rpi types today Model A+ Model B+ 2 Model B 700Mhz single-core ARMv6 256MB Ram 1 USB port No Ethernet port 700Mhz single-core ARMv6 512MB RAM 4 USB ports Ethernet port 900Mhz quad-core ARMv7 1024MB Ram 4 USB ports Ethernet port Power use: Source: http://raspi.tv/2015/raspberry-pi2-power-and-performance-measurement
  7. 7. Arduino vs Raspberry Pi Specs Arduino Uno Raspberry Pi Model B+ CPU type Microcontroller Microprocessor Operating System None Linux (usually Raspbian) Speed 16 Mhz 700 Mhz RAM 2KB 512MB GPU/Display None VideoCore IV GPU Disk 32KB Depends on SD card GPIO pins 14 digital pins (includes 6 analog) 26 digital pins Other connectivity None USB, Ethernet, HDMI, audio Power consumption 0.25W 3.5W
  8. 8. What is an Operating System (OS)? • An operating system (OS) is software that manages computer hardware and software resources and provides common services for computer programs. • Source: http://en.wikipedia.org/wiki/Operating_system • My definition: • A giant piece of software that gives programs you download/write hardware features in a standardised manner. • Closed-source vs open-source • Closed: Windows, Mac OS X • Open: Linux, FreeBSD, FreeDOS • Unix(-like) vs non-Unix • Unix: Linux, Mac OS X • Non-Unix: Windows
  9. 9. Powering up your Raspberry Pi • Connect the following first • SD card • HDMI cable • Keyboard/mouse • Connect this last • Micro-USB cable
  10. 10. First boot/Setup with raspi-config
  11. 11. Enlarge root partition
  12. 12. Boot desktop options
  13. 13. Select graphical option
  14. 14. Internationalisation options
  15. 15. Change timezone
  16. 16. Select Asia/Singapore timezone
  17. 17. Change keyboard layout
  18. 18. Change to English (US) layout • We don’t want the default UK layout 1. -> Generic 105-key (intl) PC 2. -> Other 3. -> English (US) 4. -> English (US) 5. -> The default keyboard layout 6. -> No compose key 7. -> “Yes” to terminate X server
  19. 19. Enable camera (optional)
  20. 20. Advanced Options
  21. 21. Enable SSH (remote access)
  22. 22. Reboot when complete
  23. 23. Initial setup complete!
  24. 24. SSH connection and terminal • Use “ifconfig” to get IP address • ifconfig • Look under “eth0” • Windows • Putty: Hostname: x.x.x.x, Port: 22 • Mac/Linux • Open terminal • ssh pi@x.x.x.x
  25. 25. Raspbian default username/password • Username: pi • Password: raspberry
  26. 26. Unix basics • Show directory contents: • (Do this after every command below to see what has changed) • ls or ls -l • Make directory: • mkdir lesson • Change directory: • cd lesson • Create an empty file: • touch myfile • Edit file with nano: • nano myfile • Type something random inside the text editor then press Ctrl+X to save and quit. • View file quickly: • cat myfile • Copy file • cp myfile myfile2 • Remove file: • rm myfile • Move file • mv myfile2 myfile
  27. 27. Other useful commands Command Purpose man Get information about a particular command. Eg: man ls ifconfig Get network information like IP address adduser Create user passwd Change password uname –a, uname -r Show OS information history Shows past commands you ran chmod Change permissions of a file/directory
  28. 28. Multi-user environment: Root vs non-root vs sudo • root (privileges) • One administrative user that can do anything • Most Linux distributions have root by default except for Ubuntu, Raspbian • Required for hardware access, package installation etc • non-root • Only restricted to activities in home (~) directory • sudo • Command to let certain non-root users temporarily get root privileges • Prepend in front of command that needs root • Eg: sudo apt-get install java
  29. 29. Package management • Install software from online repositories • Maintains dependencies for you • All these software come as packages • Firefox, nano, sudo
  30. 30. Using a package manager -installing htop • Always run before package installation • Update local repository index • sudo apt-get update • Upgrade all out-of-date packages • sudo apt-get upgrade • Install htop • sudo apt-get install htop • Htop: • Process information viewer like Windows Task Manager *Skip this slide if no internet connection
  31. 31. Header pins • 26 Digital-only General Purpose Input Output pins • Includes i2C and SPI • 3.3V logic levels • No analog-digital-converter • Use external ADC like MCP3008
  32. 32. Using the GPIO pins • Python programming language • LED • Button
  33. 33. Before handling GPIO • Always shut down the Rpi • sudo poweroff • Side note: Unlike the Arduino, Rpi needs to be shutdown properly before pulling the power.
  34. 34. LED and Button Connection
  35. 35. LED code 1. Open command line text editor: nano gpio.py 2. Type the code on the left 3. Quit nano with Ctrl+X 4. Run code: sudo python gpio.py Result: LED should blink at 1 second intervals Watch your indentation. Python is indentation-sensitive
  36. 36. LED and button code 1 1. Quit the previous program using Ctrl+C 2. Modify your previous code: nano gpio.py 3. Run again: sudo python gpio.py Now try pressing the button a few times. What do you notice? Why?
  37. 37. LED and button code 2 (Debouncing) Does it work properly now?
  38. 38. Now lets use the process viewer • Keep the previous code running • Open another terminal or SSH connection • Run the process viewer • htop • If you did not install htop: “ps aux | grep python” • What do you notice about Python’s CPU usage? Why?
  39. 39. LED and button code 3 (Avoid high CPU consumption) What is Python’s CPU usage now?
  40. 40. Camera hardware connection 1. Lift up the top connector
  41. 41. Camera hardware connection 2. Insert the Flexible Flat Cable (FFC), note the position of the blue strip.
  42. 42. Camera hardware connection 3. Lock the connector back
  43. 43. Python camera code
  44. 44. Some useful addons • Cobbler • Case • USB-TTL cable
  45. 45. 3.3V USB-TTL cable • An alternative way of interacting with your Rpi without keyboard and HDMI screen • https://www.adafruit.com/product/954 • Windows 1. Check COM number n from Device Manager 2. Putty, Serial COMn, Speed 115200 • Mac/Linux 1. Install screen 2. Linux: screen /dev/ttyUSB0 115200 3. Mac: screen /dev/tty.usbserial 115200
  46. 46. Sharing SD cards between Rpi 2 and others • May not always be swappable • Some distributions like Arch Linux have ARMv7 specific packages • No issue with Raspbian as of now
  47. 47. Further reading • GPIO interrupts • Other RPi operating systems like Arch Linux ARM • Read-only file system if you need unsafe poweroff • Mini-UPS for unsafe power off
  48. 48. Q&A

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