PowerPoint Presentation

Raspberry Pi

A Slice For Education

http://www.raspberrypi.org

Who Am I ?

My Name is Kris Findlay. Also known in the community as Azmodie.

I have been using the Open Source Linux operating system for over 10 years.

IT Manager for Animation Company(makers of oscar nominated The Illusionist 2010)

I am also the Webmaster for The Software Society and The UK Adhesions Society (Charity) which are both implemented, hosted and developed with open source software. ( currently Django, apache, nginx, mysql )

Email address : azmodie@gmail.com or kris.findlay@gmail.comIdenti.ca/Twitter : azmodieGoogle Plus : http://gplus.to/azmodieLinkedIn : Kris Findlay

Agenda

A Little history

More device specifics

What a Raspberry Pi can do for you ?

Other Emerging Embeded Platforms

Development Options

Possible live/video demo.

Questions

A Little history

The Raspberry Pi was created by the Raspberry Pi Foundation to inspire a new generation of children to become programmers.Foundation trustee Eben Upton, a lecturer at Cambridge at the time, saw that the skillset of applicants to CS courses had been steadily decreasing for a number of years. This is mostly due to the way that education has been geared more towards using office applications and less onunderstandingthe hardware.

The Debian images available have lots of tools for both kids and adults alike. so almost any age 4-50+ can enjoy learning about programming and electronics.

More device specifics

Model A256Mb RAM1 x USBno Ethernet

Model B256Mb RAM2 x USB1 x Ethernet

Both models have a700MHz Armv6 (Arm11)Quad-Core Graphics chip

Diagram of Model B

What a RaspberryPi can do for you

Xbmc @ Full 1080p HD

Linux desktop - just add keyboard and mouse.

Linux low powered server (fileserver etc..)

Attach webcam and monitoring software

Interface with electronics from leds,solenoids,switches,mosfets etc..

Almost anything else you can imagine

Other Emerging Embeded Platforms

VIAAPC is powered by a VIA WonderMedia 8750 800 MHz ARM11 processor, 512MB of DDR3 memory, and 2GB of flash storage. The chip supports 1080p HD video playback, H.264 video encoding, and OpenGL ES 2.0 graphics.

Android Mk802 A10 AllWinner Mini Computer
The little computer looks like a portable storage device, but it has a 1.5 GHz Allwiner A10 processor, 512MB(1Gb spotted) of RAM, and 4GB of storage. It ships with Google Android 4.0 software

Beagle Board (1GHZ ARM 7) and Beagle bone (720MHz ARM 7) also PandaBoard (all ~$80-$180)

Development Options

Python (Quick2wire),C(WiringPi), Bash,Basic,etc..

Scratch
Geared to students and non-developers

Various OtherLinuxenvironmentsincluding
Aros (Linuxbased port), Arch, Debian, Gentoo etc..

Many open-source libraries being ported to arm.

Cross-compilertool-chainsavailable.
(both soft and hard float)

Scratch

The MIT program Scratch is designed to provide an accessible way for kids to learn about coding.

The program's interface makes it easy to build and change software by dragging and dropping commands and changing variable values through simple menus.

The version installed on the Pi comes loaded with a simple car-racing game. Users can add and remove commands from the game, then press play and immediately see the effect of those changes - for instance, tweaking how cars handle or adjusting the animation for car crashes.

Scratch Example

Quick2Wire (Python GPIO)

quick2wire have released a python api tosafelyaccessthe gpio pins from user land. eg. anyone in the gpio group.as wellas allowing clean import and export of pins.

Heres the code that drives an LED:

from quick2wire.gpio import Pinfrom time import sleep

out_pin = Pin(12, Pin.Out) for i in range(0, 10): out_pin.value = 1 sleep(1) out_pin.value = 0 sleep(1)out_pin.unexport()

http://quick2wire.com/https://github.com/quick2wire/quick2wire-python-apihttps://github.com/quick2wire/quick2wire-gpio-admin

My Raspberry Pi Demo

My demo focuses on input and output from python script through the gpio pins to some simple electronics components.

This simple demo takes input from a switch whichilluminatesa red led to confirm it was pressed.

using the quick2wire api for python.when the switch is pressed a counter is increased by 1 until it reaches 16 at which point it will reset counter to 0.

the corospoding value of counter at any one time is then convirted to binary value and displayed on the 4 green and yellow leds.

eg. counter = 3 bin outpit = 0011 led pin = 0011

My Raspberry Pi Demo

My Raspberry Pi Demo

#!/usr/bin/python3

import timeimport stringfrom quick2wire.gpio import Pin

# import pins for outputout_pin1 = Pin(11, Pin.Out)out_pin2 = Pin(13, Pin.Out)out_pin3 = Pin(15, Pin.Out)out_pin4 = Pin(16, Pin.Out)

# import pins for inputin_pin = Pin(7, Pin.In)

# init countcount = 0

try:while True:# get input value of button
mybutton = in_pin.value
if mybutton == False:
count = count + 1
# reset at 16
if count == 16:
count = 0

rpi-count.py @ https://github.com/azmodie/rpi-scripts

# outputs binary reprisentation to 4 leds# that matches count. binvalue = bin(i)[2:].zfill(4) out_pin4.value = binvalue[-1] out_pin3.value = binvalue[-2] out_pin2.value = binvalue[-3] out_pin1.value = binvalue[-4] time.sleep(.2)
# trap ctrl+c to cleanly unexport pinsexcept KeyboardInterrupt: out_pin1.unexport() out_pin2.unexport() out_pin3.unexport() out_pin4.unexport() in_pin.unexport()

expEYESProject

The expEYES (experiments for Young Engineers and Scientists) aims to provide a low cost platform for experimentation and education in electronics and physics.

The device has 12 bit Analog I/O, Digital I/O, time interval measurements, & other features accessible from Python. It is packaged with a number of accessories & software which can be used to perform a large number of experiments.

For example, the device can be used to studyelectromagnetic induction, the conductivity ofwater,to measure gravity by time of flight,alongside manyother applications. Itaims toenable anybody todevelop new experiments.

http://expeyes.in/articles/54/expeyes-meets-raspberry-pi

Links to More Details / Projects

A coffee machine controlled by Raspberry Pihttp://moccapi.blogspot.co.uk/

Solinoid based glockenspielhttp://www.thebox.myzen.co.uk/Raspberry/Buffer_Board.html

Simple Guide to the RPi GPIO Header and Pinshttp://www.raspberrypi-spy.co.uk/2012/06/simple-guide-to-the-rpi-gpio-header-and-pins/

Raspberry Pi Driving a Relay using GPIOhttp://www.susa.net/wordpress/2012/06/raspberry-pi-relay-using-gpio/

Hardware Ladder Gamehttp://www.raspberrypi.org/archives/1488

Speach Recognitionhttps://sites.google.com/site/observing/Home/speech-recognition-with-the-raspberry-pi

Ideas for model railwayshttp://www.raspberrypi.org/phpBB3/viewtopic.php?f=37&t=5993

Contact Details & Any Questions ?

Email address : azmodie@gmail.com / kris.findlay@gmail.comTwitter : azmodie
Facebook : azmodieLinkedIn : Kris Findlay