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Raspberry Pi
Linux based ‘cut downmobile phone’
New Technology Old performance
SD Card boot and disk Debian image standard Python on board
and Scratch
Micro USB power – can power from laptop Optional
HDMI/AV output USB Keyboard + Mouse Ethernet PIO for VERY cheap/easy access to custom I/O
Mobile
Mobile Based Internet Access
Wifi
Wired Internet provider
Laptop
Mobile
Wireless
Access Point
Wireless Access Point
Wifi
Wired
3G
3G
Wireless access points have SSID (and encryption)
Pirate Box
Laptop
Wifi
LinuxBox
Wireless
Access Point
Filestore
Ad hoc, local wireless access SSID can be anything
Security risk... May not have encryption (very) local wireless file server
Wifi
Wifi Direct – new standard
Replacement for Bluetooth? Devices become Wireless Access Points, e.g.
printer scanner camera file store
Devices broadcast an SSID for connection Accessible from any wifi device
Laptop Smartphone Tablet Console
etc. Generally need to install an application/driver
Tablet
Smartphone
Classroom Area Networks
Laptop Wifi
(very) local Wireless Web Server n.b. Typically NO Internet Access May be called ‘Personal Area Networks’
LinuxBox
Wireless Access Point
Web Server
Application Server
Local Database
Clientside Software
Html 5 Browser based applications: jQuery Mobile (library)
Javascript+CSS library based on jQuery Cross platform
Application cache The application works offline
i.e. when the CLAN server is unavailable Local Storage
Allows persistent data on the client device, e.g.user idapplication data, e.g. answers to questions,
downloaded feedback, etc.
Client application is ‘installed’ from the Server
Serverside Software
Most Serverside technologies availabledotNET presently an issue
Windows is missing a ‘piece’ of the puzzle
Suitable are:LAMP - Apache / MySql / PHPRuby on RailsNode.jsPython Java and JSPGroovy on Grails
Proof of concept - Quiz
Nokia Internet Tablet Slow processor, low memory, linux based equivalent to Raspberry Pi (but available at the time )
Deliberately not ‘industry’ strength Local IP client address allocated by DHCP Domain name redirection
e.g. google.co.uk will load local web server pages Uses ‘dnsmasq’ – Linux software
Tablet
Smartphone
LaptopWifi
N810 Internet
Tablet
Wireless Access Point
webpy static files
webpy application
Sqlite Database
Html 5jQuery Mobile
Proof of concept - Quiz
jQuery Interface
Proof of concept - Quiz Sqlite persistence
jQuery Mobile widgets
Proof of concept - Quiz
Admin interface Extend Database
CLAN Benefits
Can be used anywhere (within range)Up a mountain, on a coach/ship/train/plane In schools with no wifi/internet/login In Hallam
Allows any server software, i.e.No need to ask IT Services But - no support from IT Services
Technical demonstrations, e.g.Ruby on RailsWireless Game server
Runs locally Runs only while switched on
On Campus ideas
‘Regular’ classes:Registering physical attendance at
seminar/lectureGiving immediate (anonymous) feedback
e.g. ‘traffic light cups’ ‘Throw away’ comprehension tests
Open days - Quick, easy access toCourse and/or module detailsTimetablePersonal/anonymous questionsRegistering interest
Off Campus ideas
Coach/field trip, e.g. reading objectives (class resources)choosing groupssubmitting findings reportgiving feedback
School/College visitsSame as Open Days
Take the data with you...
Potential for ‘anywhere’ setupe.g. Train Station, Students Union, Library,
etc. May allow ‘uncool’ access
Conference usage
Bring wireless network with youNo need to setup security logins on site
All setup can be done offsite and then moved
No need for even a power supply Allow registration by smartphone
Have to be physically present Database can be copied at end (or disposed
of) Reduce registration queues No need for a desk
Registration staff could walk around the registration area
While attendees chat/relax/network
What CLANs are unlikely to be
A way to access the internetCan be – but mostly pointless
Persistent environmentsSince not always availableBut can cross multiple sessionsNoSql databases could allow syncing to
internet Available from the internet
Just local (wifi) access onlyBut Ethernet is on board (model B RPi)
Issues Availability of Smartphones
Could share one e.g. guest access with ‘split’ screen or tabs
Only one connection – so no Internet access No email, blackboard, wikipedia, facebook, twitter,
etc. Could be a good thing
Html 5 Browser Becoming much more popular/available
Technical issues Susannah’s mobile didn’t work Wireless contention
Security But – raises awareness of ‘hijacking’ possibility
Performance
Next - Raspberry Pi CLAN Similar power to n810 Cheap
Runs linux (debian) Includes python as standard
Boots from an SD card Can have different images for different
purposes Swap card to swap class !?
Can power from a laptop HDMI output (if needed) But - some Wifi Driver issues – early days...
RPi Wifi USB
SD Card
Power lead
Total
£20/35 £15 ~£4 ~£2 £41/56
