Intro to Raspberry Pi Brad Luyster Brad. Luyster@gmail. com
Before We Start ● Windows Users – – Navigate to “Raspberry Pi Boot Camp” – ● Go to http: //files. lvl 1. org from your web browser Download all the files, then Install Real. Term, Win 32 Disk. Imager and Putty (Keep the. img file for later) Linux/Mac Users – Go to http: //files. lvl 1. org from your web browser – Download “ 2013 -07 -26 -wheezy-raspbian. img” – Install Picocom (Or know how to use screen to open a serial port) – Know how to use “dd” and “ssh”
What is the Raspberry Pi? ! 35 ! $ w Wo
Raspberry Pi I/O
Raspberry Pi I/O http: //elinux. org/RPi_Hardware http: //elinux. org/RPi_Verified. Peripherals http: //elinux. org/Rpi_Low-level_peripherals
Raspberry Pi I/O
Raspberry Pi OS ● Raspberry Pi is a full blown computer ● Runs Linux – ● Windows Licensing restrictions make that a nonstarter You're going to learn how to use Linux, yay!
Pi Project Inspiration
Running your Pi ● Software – Windows ● ● – Linux/Mac ● ● Win 32 Disk. Imager Real. Term Picocom Hardware – SD Card – USB Cable – Serial Adapter
Pi OS Choices ● Raspbian ● Arch. Arm ● Pi. Dora
Installing the Image ● Windows – ● Extract Image file to SD Card using Win 32 Disk. Imager (Select Image file and SD Drive) Linux – Use “dd bs=4 M if=[IMAGE FILE] of=/dev/sd[DRIVE]” – Be very careful to select the correct “of” drive.
Connect the Serial ● Black to GND ● White to TXD ● Green to RXD ● RED IS DISCONNECTED
Logging in to Pi ● Username is “pi” ● Password is “raspberry” ● You are now at a Linux Console
Linux Console Basics ● “ls”: List files in the current directory ● “cd”: Change Directory ● “cp”: Copy File ● “mkdir”: Make Directory ● “nano”: Open Text File Editor
Config ● On first boot, run “sudo raspi-config” ● Sudo – Super User Do – ● ● Needed to do risky things on Linux Expand Filesystem is the most important thing to do here Reboot Afterward
Hello World! ● Grab and LED, and a 560 ohm Resistor (Green, Blue, Brown) ● Resistor to GND ● Short LED leg to resistor ● Long LED leg to #4
Hello World ● ● ● At the console, type “sudo python” and press enter to open python “import RPi. GPIO as GPIO” to import the GPIO module “GPIO. setmode(GPIO. BCM)” to set board pin numbering ● “GPIO. setup(4, GPIO. OUT)” ● “GPIO. output(4, GPIO. HIGH)” to turn LED on ● “GPIO. output(4, GPIO. LOW)” to turn LED off
More Advanced “Hello World” import RPi. GPIO as GPIO import time GPIO. setmode(GPIO. BCM) GPIO. setup(4, GPIO. OUT) while(1): GPIO. output(4, GPIO. HIGH) time. sleep(1)
Inputs ● ● Put switch in breadboard. Connect 10 k resistor (Brown Black Red) between 3. 3 v and switch ● Connect other side of switch to GND ● Connect side with resistor to #17
Polled Inputs import RPi. GPIO as GPIO. setmode(GPIO. BCM) GPIO. setup(4, GPIO. OUT) GPIO. setup(17, GPIO. IN) while(1): if GPIO. input(17) == GPIO. LOW: GPIO. output(4, GPIO. HIGH)
Interrupt Inputs import RPi. GPIO as GPIO. setmode(GPIO. BCM) GPIO. setup(4, GPIO. OUT) GPIO. setup(17, GPIO. IN) def my_callback(channel): print("Switch Pressed!")
Debounced Interrupts import RPi. GPIO as GPIO. setmode(GPIO. BCM) GPIO. setup(4, GPIO. OUT) GPIO. setup(17, GPIO. IN) def my_callback(channel): print("Switch Pressed!")
Networked Pi ● Plug in your network cable ● Type “ifconfig” to get network interface config ● Note the “inet addr” for “eth 0”
Networked Pi ● “sudo apt-get update” ● “sudo apt-get upgrade” ● Upgrades all software packages ● “sudo apt-get install [package]” to install new – Try it now! “sudo apt-get install sl”
Resources ● Buy a Pi – – RS Electronics – ● Element 14 *** MCM Electronics *** Buy Pi Stuff – – ● *** MCM Electronics *** Adafruit Learn – Learn. adafruit. com – Raspberrypi. org – Elinux. org – LVL 1!
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