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Raspberry Pi, RISC OS, Raspbianand the Big Picture
Gordon Taylor
www.energypolicy.co.uk 2012-10-25
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www.energypolicy.co.uk 2
RISC OS at 1920 x 1080
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www.energypolicy.co.uk 3
RISC OS
• A fast and lightweight platform, requiring little RAM
• Runs paid-for software, from small businesses
• Runs open-source software, from the community
• Can drive paid-for hardware expansions
• Can drive open-source hardware projects
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www.energypolicy.co.uk 4
RISC OS
• Is proven in schools, both UK and overseas
• Is particularly suitable for Primary schools
• The usual interface is Graphical – with Icons
• For textual programming, BBC Basic is included
• For graphical programming, Scratch can be added
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www.energypolicy.co.uk 5
Raspbian at 1920 x 1080
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Raspbian (Linux)
• Is proven in universities, both UK and overseas
• Yet can also be used in schools and at home
• For Primary, it can start with a Graphical interface
• For graphical programming, there is Scratch
• For textual programming, Python – and many more
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www.energypolicy.co.uk 7
Raspbian (Linux)
• Over 10,000 apps can be downloaded for free
• Linux can be used on x86 PCs at home or at work
• (K)Ubuntu Linux is very similar to Raspbian
• Both are based on Debian Linux
• Linux is available for every processor & platform
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Data Computing, Physical Computing
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Data Computing
• This uses only the keyboard and screen + printer
• Major apps are word processing and spreadsheets
• Others include 'painting', 'drawing' and CAD
• All these are available for RISC OS and Raspian
• They already run fast enough and will be faster
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www.energypolicy.co.uk 10
Media Computing
• This uses a remote control and a TV screen
• The Media Player can be a Pi running Raspbmc
• It has power enough for HD video and audio
• The Media Server can be a Pi running SqueezePlug
• It consumes only 3-5 W, for 'always-on' operation
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www.energypolicy.co.uk 11
Physical Computing
• Physical computing interacts with the real world
• Thus the inputs are from sensors e.g. temperature
• And the outputs are via actuators e.g. motors
• Most such systems are 'embedded' in devices
• Some run continuously, so low power is important
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Physical Computing
• Is taught as 'Measurement and Control'
• All measurements should be calibrated
• Most controls are 'closed loop', with 'feedback'
• For stability, the feedback must be negative
• Such control loops operate also in natural systems
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Control in Natural Systems
• Human body temperature – usually stable at 37 C
• Global average temperature - rising
• Polar temperatures – rising faster
• Rising temperatures are due to positive feedbacks
• Such temperature rises are almost irreversible
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Control in Primary SchoolsPi with e.g. Data Harvest FlowGo Interface
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Control in Primary SchoolsData Harvest FlowGo controlling Lighthouse
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Control in Secondary SchoolsPi with e.g. Fen Logic GertBoard
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Control in Secondary SchoolsPi Control of Dual H-Bridge with Software PWM
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Control in IndustryPi with e.g. Heber X10i
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Control in IndustryHeber control for 'A Good Cup of Tea'
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The Big Picture
• ARM processors are the most numerous worldwide
• They are dominant in smartphones and tablets
• With higher energy efficiency than x86 processors
• This is crucial for battery-powered devices
• And becoming more so for mains-powered devices
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The Big PictureARM 'big-LITTLE' can extend battery life by up to 70%
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The Big Picture
ARM servers have ~ 10x energy efficiency of x86
Each Calxeda EnergyCore takes 5 W, idles at 0.5 W
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The Big Picture
• Pi's can replace Wintel PCs in schools and homes
• This will save money for schools and parents
• So it will save money for the UK economy
• The Pi is a better platform for learning and doing
• So it will increase income for the UK economy
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And Finally..Comments and questions: