(Raspberry) Pi Day Extravaganza! Brought to you by: UMIEEE, IEEE GOLD, Visions Electronics Presenters: Troy Denton, Ahmad Byagowi Disclaimer Any opinions or viewpoints expressed do not necessarily reflect those of IEEE, IEEE GOLD, UMIEEE, or any of our sponsors Any software provided or mentioned is for
educational purposes only You break it, you buy it Just kidding, you already bought it The Agenda (1/2)
Introductions and parts hand-out SD Card flashing procedure, setup walk-through Raspberry Pi intro (while we flash SD cards) Hardware overview Software (OS) overview Community Support
Loading up the Desktop (GUI) Command line fun installing software for our workshop The Agenda (2/2)
Programming example 1 Hello World Break for Pie & demonstrations! Programming example 2 Blinking Lights
Programming example 3 - The MCP3001 SPI ADC Arduino interaction Various demos What is not covered In-depth linux material We will guide you through examples, however to do this topic justice would require a series of workshops
Programming techniques Will give insights and explanations relevant to examples only, again in the interests of time Circuit theory Again, insights relevant to the material covered today only Arduino use We will get a basic example working, but thats about it
What is not covered As much as I would like to teach all of this extra material, this is a Raspberry Pi event UMIEEE regularly throws workshops that cover these topics If questions stray too far from the prepared material, I will defer them to after the allotted
time (9:30) Will stay beyond 9:30 if there is interest Feedback is appreciated! Introductions Introductions get your parts! Presenters: Troy Denton, Ahmad Byagowi Honorable mentions:
Memory Express Visions Electronics UMIEEE IEEE GOLD The Raspberry Pi Foundation! ( http://raspberrypi.org) Setup
Setup Log on to the windows machine in front of you Password is ece Go to the following website: http://troydenton.ca/rpi.html Unzip the UMRPImg_4G.zip that is on your desktop If it is not there, download it from http://troydenton.ca/UMRPImg_4G.zip
Setup flashing the card Windows *nix Extract win32diskimager
Figure out /dev/ path for your SD card Right click win32diskimager, run as administrator dd bs=4M if=/path/to/
rpi.img of=/dev/ Browse to the extracted rpi.img file Setup flashing the card Windows
Select the proper device in the Device drop down. On lab machines this should be device E:/ or G:/ Click Write Be careful!!
*nix Figure out /dev/ path for your SD card dd bs=4M if=/path/to/ rpi.img of=/dev/ Raspberry Pi Intro
Raspberry Pi - Philosophy Raspberry Pi - Philosophy Raspberry Pi - Philosophy Raspberry Pi - Philosophy Raspberry pi - Philosophy
( )= Raspberry pi - Philosophy raspberrypi.org forums: Just shy of 60,000 members
http ://www.raspberrypi.org/archives/tag/educational-m anual http://www.adafruit.com/blog/category/raspberry-p i / The latest and greatest raspberry pi projects and tutorials Amazing online presence (stats as of 2013-03-13)
15,000,000 results for raspberry pi launched 2012 27,000,000 results for arduino launched 2005 Raspberry pi - Philosophy Raspberry Pi - Hardware A Pi-casso?
Raspberry Pi Hardware Coming Soon! Raspberry Pi Hardware Broadcom BCM2835 CPU core is an ARM11
GPU + CPU + RAM Raspberry Pi Hardware Broadcom BCM2835
CPU core is an ARM11 RAM: 256MB (Model B Rev1) 512 MB (Model B Rev2) CPU Speed: can technically go up to 1GHz Contains all logic for serial buses (USB, SPI, I2C) GPIO pins go _directly_ to the
CPU Raspberry Pi Hardware Broadcom BCM2835 CPU core is an ARM11 Can overclock it via software settings
CPU and GPU each have their own memory allocation where the memory split occurs is configurable in software GPU needs a minimum 16MB Raspberry Pi - Hardware
Digital inputs and outputs only! No analog! Raspberry Pi - Hardware JTAG header Display
connector Camera connector Raspberry Pi - Hardware USB to Ethernet Adapter
Raspberry Pi - Hardware Raspberry Pi - Software Designed with linux systems in mind, not necessarily required RISCOS Arch linux Fedora Occidentalis
Raspbian (our distro of choice) A slew of others. Raspberry Pi - Software Raspbian is what is known as the Operating System (OS) Similar to windows running on your home PC, the raspberry pi requires an operating system to work Raspbian is a special-purpose distribution based on Debian
(a variant of linux) The OS is what lets the raspberry pi not only run programs, but run multiple programs concurrently It accomplishes this with a scheduler in the OS Simply put, this makes programs take turns Only one program is actually executing at any one time Raspberry Pi - Software
The SD card contains: The OS All Programs on the Raspberry pi All permanent (nonvolatile) storage, in general Loading up the OS Loading up the OS Plug in the Network cable
Plug in your SD card Plug in your HDMI cable Plug in the USB hub Plug in mouse and keyboard from desktop computer Set monitor to hdmi (press this button twice ) Plug in usb power (act fast) The Raspberry pi automatically boots off of the SD card
Loading up the OS You should see the raspberry pi logo, and a bunch of computer jargon printing to the screen This is the linux kernel in action! When it is finished, you will be prompted to login. Username: pi Password: raspberry
Loading up the OS You are now at the system prompt Commands to try: ls ls a, ls l, Lists the files in the directory cd Move to directory
Enter cd without a directory to return home top This shows all of the programs running Loading up the OS Lets take full advantage of our SD card: type sudo raspi-config and hit enter This is a program you can use to configure the raspberry
pi Select expand_rootfs Loading up the OS Loading up the OS To load up the graphical desktop, type startx and hit enter LXDE is the Lightweight X Desktop Environment
In linux, you can use different programs to provide a graphical interface GNOME KDE LXDE XFCE Etc Many programs have been preinstalled, look
around! Loading up the OS Midori internet browser OpenOffice.org Open source alternative to Microsoft Office, compatible XBMC Xbox media Center Demo on this later
Roughly equivalent to a 300MHz Pentium 2 Loading up the OS When were done looking around, close your open programs (for performance purposes) Double click the LXTerminal icon on the desktop This will open a small terminal window Command line fun
installing software for our workshop Command line fun In the console window, enter the following: cd git clone git://github.com/doceme/py-spidev.git sudo apt-get install python-dev Will take a few minutes
cd py-spidev make sudo make install Command line fun What did we just do? cd Command used to change directories
git clone git://github.com/doceme/py-spidev.git Download sourcecode from a git repository sudo apt-get install python-dev Download and install development libraries from our package manager make
Compile the sourcecode that we got via git into usable programs sudo make install Install these programs into system directories Command line fun sudo nano /etc/modprobe.d/raspi-blacklist.conf Change the file so it looks like:
#blacklist spi-bcm2708 #blacklist i2c-bcm2708 Use arrow keys to move around Then hit CTRL+O to save, enter to confirm CTRL+X to exit Command line fun To enable the SPI drivers, we need to restart the
system sudo shutdown r now More on SPI later We are now done installing software! Programming example 1 Hello World Without further ado, lets fire up geany and write
our first program on the raspberry pi! For our purposes today, we will be coding in Python. Programming example 1 Hello World Log in, startx if you havnt already Open up geany (LXDE icon/start menu > programming > geany)
Enter: print Hello, World! print This is our first print Python example! Programming example 1 Hello World Save this as helloworld.py in your home directory
To run the program, we need to go back to our command window. (open if you havnt yet) Enter: cd Enter the command: python helloworld.py Congratulations, Youre a nerd now Break for pie! Programming example 2 blinking
lights Hello world is the first step in programming traditional computers Similarly, blinking an LED is the first step in the microcontroller world This is accomplished through the GPIO pins! GPIO: General Purpose Input Output Programming example 2 blinking
lights GPIO pins are special connections to the processor that can be controlled by code Instead of your program telling the raspberry pi to put words on the screen, you can tell the raspberry pi to turn a switch on or off Programming example 2 blinking lights
Each GPIO pin is either switched on, or off. We call a function to change its state. Hey! Turn it on! Programming example 2 blinking lights Each GPIO pin is either switched on, or off. We call a function to change its state.
Turn it off now! Programming example 2 blinking lights Enter, the breadboard: Programming example 2 blinking lights
Little to do with bread Programming example 2 blinking lights Rows of adjacent holes are connected together Programming example 2 blinking lights The outer strips are connected as well
Programming example 2 blinking lights Pin numbering: BCM style Programming example 2 blinking lights Pin numbering: BCM style
Programming example 2 blinking lights Pin numbering: Raspberry Pi header - NOT USING THIS! Just FYI 1 3 . . .
2 4 25 26 Programming example 2 blinking
lights Programming example 2 blinking lights Open up your terminal cd mkdir gpio cd gpio wget troydenton.ca/blink1.py
sudo python blink1.py Programming example 2 blinking lights While this is running, open the file in geany Programming example 2 blinking lights
Programming example 2 blinking lights wget troydenton.ca/blink2.py sudo python blink2.py Programming example 3 reading an input 0!
What do you see ?? voltage Similar to how we can tell the CPU to output a value, we can have the CPU read a value 5V
0V tim e Programming example 3 reading an input
1! What do you see ?? voltage Similar to how we can tell the CPU to output a value, we can have the CPU read a value 5V
0V tim e Programming example 3 reading an input
Programming example 3 reading an input Limitations of GPIO: When accessing via python, not at its fastest C is much faster but, not as easy for a workshop Max GPIO output speed (using python in raspbian) ~60 kHz by this measurement
Upwards of 80 observed Jitter issues Acceptable for real-time? Not likely! Max input speed slightly better ~111 kHz Programming example 3 reading
an input wget http://troydenton.ca/blink3.py sudo python blink3.py Intro to SPI SPI: Serial Peripheral Interface bus A loose standard used to transmit data serially Implementation is up to chip manufacturers
Many chips out there speak SPI EEPROMs (memory) Some Network interface ICs Analog to digital converters (MCP3001) In this section, we will use the MCP3001 to read an analog voltage into the raspberry pi Intro to SPI
Example from MCP3001 datasheet Analog input Digital Output Intro to SPI Example from MCP3001 datasheet Analog input
Digital Output Intro to SPI Example from MCP3001 datasheet Intro to SPI Installing SPI Libraries Run the following commands:
cd mkdir adc cd adc wget http://troydenton.ca/adc.py python adc.py Turn the potentiometer and watch the display change Arduino interaction The arduino is another embedded
platform/microcontroller Based on the Atmel AVR series of microprocessors Today we are going to use our embedded computer (Raspberry pi) to program our embedded computer (Arduino!) Because we can. Arduino interaction Plug your arduino into an open USB port on the
raspberry pi Open up the Arduino IDE by clicking start > Programming > Arduino IDE In the Arduino IDE, select Tools > Board, and select your model of Arduino If you do not know which, ask one of us and we will get it going for you Arduino interaction
Next, go to tools > Serial Port > /dev/ttyUSB0 Load up some example code by going to File > Example > Basics > DigitalReadSerial Arduino interaction Modify the code to look like this: Then, click the
button to upload the test code to the arduino Click to bring up the serial console Arduino interaction Make sure the Baud Rate is set to 9600 in the
serial console: You should see your test message printing once a second Demos and other installed software
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