The_MagPi_issue_9.pdf

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I I n n d d u u s s t t r r i i e e s s

RaspberryPiisatrademarkofTheRaspberryPiFoundation.

ThismagazinewascreatedusingaRaspberryPicomputer.

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WelcometoIssueNine,

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Thismonthweareverypleasedtopresentaninterviewwithengineer

andfounderofAdafruitIndustries,LimorFried.Shehasbeenan

encouragementtomany,providingtutorials,answeringquestionsand

supplyingpartstobuildallsortsofinterestingprojects.

Thisissuealsocontainshardwarearticles,setupinstructionsforRISCOS

andArchLinuxoperatingsystems,andourregularprogrammingarticles

onScratch,PythonandC.

AshStone

ChiefEditorofTheMagPi

MagPi team

Ash Stone-ChiefEditor/Administrator

Tim 'meltwater' Cox-Writer/PageDesigns/Admin .

Chris 'tzj' Stagg-Writer/Photographer/PageDesigns

Colin Deady-Writer/PageDesigns

Jason 'Jaseman' Davies-Website/PageDesigns

Matt '0the0judge0'-Website/Administrator

Aaron Shaw-Writer/PageDesigns/Graphics

Ian McAlpine-Writer/PageDesigns/Graphics

Sam Marshall-PageDesigns/Graphics

W. H. Bell-Writer/PageDesigns

Bryan Butler-PageDesigns/Graphics

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Mark Robson-Proof-reading

Alex Baker-Proof-reading

Richard Wenner-Proof-reading

Steve Drew-Proof-reading

Chosp-Proof-reading

Benjamin Donald-Wilson-Proof-reading

Mike Richards-Proof-reading

Guest writers

Alex Eames

Eric PTAK

Norman Dunbar

Pete Nowosad

Ross Taylor

Simon Walters

Cover: LimorFried,engineerandfounderofAdafruitIndustries.

Contents

04 An interview with Limor Fried from Adafruit

FounderandengineerofAdafruitIndustriesLimorFriedtalkstotheMagPi.

08 WebIOPi - Raspberry Pi REST framework

LearnhowtocontroltheRaspberryPi'sGPIOinterfacefromawebbrowser.

12 Backing up your Raspberry Pi

BackupyourSDcardwithoptionalcompressionandDVDarchiving.

15 Win some more Raspberry Pi goodies

ThismonththereisanopportunitytowinaGertboard.

16 Quick2Wire's I/O interface board for the Raspberry Pi

Areviewofthekitandtheassembledboard.

18 An introduction to RISCOS

AbasicintroductiontotheRISCOSoperatingsystem,fromSDcardinstallationtothedesktop.

20 Installing & configuring Arch Linux

LearnhowtoinstallArchLinux,abarebonesrollingLinuxdistributionontheRaspberryPi.

22 An introduction to Vala programming

WritingcodeinaVala,ahighlevelC#stylelanguage.

24 This month's Raspberry Pi events

Findoutwhatisonthismonth.

26 The C Cave - structs, histograms and data analysis

Learnhowtobuildmorecomplicateddatastructuresandprograms.

32 Scratch Patch - controlling the GPIO interface from Scratch

LearnthefirststepstoGPIOcontrol,allowingmorecomplicatedinterfacing.

34 The Python Pit - drive your Raspberry Pi with a mobile phone

Anintroductiontowebpy,providingmobilephoneconnectionstopythonprojects.

36 Feedback and question time

Commentsandfeedbackfromreaders.

She is an open source hardware advocate, founderofAdafruit

andwas voted"Entrepreneurof2012". Who is LimorFried?

[MagPi] Fi rst our congratul ati ons on bei ng

awarded Entrepreneur magazi ne’ s

“Entrepreneur of 201 2” l ast month. Do you

thi nk thi s i s the fi rst si gn of mai nstream

acceptance of “hacki ng” , i n i ts true defi ni ti on

and the “maker” movement i n general ?

degree i n El ectri cal Engi neeri ng and

Computer Sci ence. What i nspi red you to start

your own company rather than “cut your teeth”

wi th an i ndustry empl oyer?

[Limor] Runni ng your own company i sn't for

everyone, I wasn't even sure i t was for me at

fi rst, but the freedom and fl exi bi l i ty to pursue

whatever you want and work on the i mportant

thi ngs i s seducti ve and

rewardi ng. There's a ton of

ri sk of course, but the

bi ggest ri sk i s regret l ater i f

you don't at l east try.

There's never been a

better ti me to run a

company that cel ebrates

smart peopl e, smart

communi ti es and l earni ng.

The demand for efforts l i ke

the Raspberry Pi has total y

changed Adafrui t. Anyone

can l earn to desi gn

el ectroni cs, wri te code and

have mul ti pl e ways to get

the products i n the hands

of customers. One of the

thi ngs about runni ng a

company i s you can take

on some proj ects that at

fi rst do not seem to have

i mpact on the bottom l i ne,

but you can take the ri sk.

M any of the proj ects we do at Adafrui t woul d

never be approved by a bi g company sol el y

focused on a few products. We have over

1 , 200 products and some of them are purel y

experi mental .

[Limor] Thank you so much for the ki nd

words. The Raspberry Pi communi ty deserves

a l ot of thanks as wel l , al l of

the voti ng was vi a the

i nternet and the Pi

communi ty real l y ral l i ed for

us! I bel i eve the maker

movement i s past the "i s

thi s a real thi ng?" stage.

About 6 years ago I was

i nvi ted to a conference

about the new maker

movement that had j ust

started to happen and a

very l arge company made

a poi nt to say Adafrui t was

not a real company. I t's

been a chal l enge every day

to prove a great busi ness

can support a great cause

l i ke open-source. Bei ng

awarded Entrepreneur

magazi ne's "Entrepreneur

of the year" means there

are l ess barri ers for

someone starti ng out now.

They don't need to hear somethi ng i s not

possi bl e or not real , they can see there are

unl i mi ted opportuni ti es for maki ng and shari ng

- and runni ng a successful busi ness.

[MagPi] We’ re getti ng a l i ttl e ahead of

oursel ves. Let’ s take a step back. You are the

founder and engi neer of Adafrui t, the N ew

York based company that you formed i n 2005

after

[MagPi]Your ni ckname i s “Ladyada” whi ch I

am assumi ng has some rel ati on to Lady Ada

Lovel ace, the worl d’ s fi rst computer

programmer? Of course the l i nk to Adafrui t i s

you

graduated

from

the

M assachusetts

I nsti tute of Technol ogy (M I T)

wi th

a master's

obvi ous,

but

what

was

the

i nspi rati on

behi nd

the

name?

M aybe

you

had

can see that the Raspberry Pi secti on i s one of

the l argest.

premoni ti on

that

you

woul d

worki ng

wi th

raspberri es one day?

[Limor] At Adafrui t we have a bi g goal and

mi ssi on; to teach ki ds programmi ng and

maki ng. . . and i t's actual l y teach everyone, not

j ust ki ds. We thi nk everyone shoul d be abl e to

use a l ow-cost educati onal computer to l earn

el ectroni cs and of course l earn a computer

l anguage. We struggl ed wi th how we woul d be

abl e to start thi s endeavor and that's when the

Raspberry Pi was announced. I t became so

popul ar so qui ckl y that i t real l y kept us on our

toes meeti ng demand. Every si ngl e thi ng we

desi gn or curate i n the store i s tested by me.

For the Raspberry Pi we knew i t woul d be

i mportant to have the best educati onal

resources i n addi ti on to the best support. Si x

months l ater, the Pi secti on i s one of our

l argest and the Pi tutori al s are the most

vi ewed on the Adafrui t Learni ng System

http: //l earn. adafrui t. com/category/raspberry-pi .

[Limor]When I was younger al l I di d was pl ay

around wi th Li nux, i nstal l i ng i t on anythi ng I

coul d fi nd and expl ori ng al l the thi ngs that

made i t work. I n my hacker days, actual l y I 'm

sti l l i n those days now : ) … , my ni ckname was

Ada. I was al ways programmi ng, bui l di ng,

reverse engi neeri ng so the Ladyada name has

stuck wi th me from the start. Looki ng back at

al l the Li nux hacki ng i t seems l i ke I was i n

trai ni ng to work on the Raspberry Pi . For the

younger fol ks out there who l i ke spendi ng ti me

hacki ng

away,

i t

real l y

can

end

bei ng

fantasti c adventure and a career!

[MagPi] We have al l heard of open source

software and i t i s used every day by mi l l i ons of

peopl e, i ncl udi ng 1 mi l l i on pl us Raspberry Pi

users. But you are heavi l y i nvol ved i n the open

source hardware communi ty. I ndeed al l

Adafrui t products are made avai l abl e as open

source

hardware

wi th

free

downl oad

schemati cs,

PCB

l ayouts,

fi rmware

and

software.

Ardui no

i s

popul ar

exampl e

open

source

hardware

but

can

you

tel l

about

what

you

thi nk

i s

the

future

open source hardware?

[Limor]I l i ke to ski p to the end of the story, al l

hardware i s copyabl e. There are trademarks

for l ogos and names and patents for some

thi ngs, but i f i t's made out of physi cal bi ts and

i t's i nteresti ng, someone i s goi ng to copy i t. So

I 've al ways worked back from that, i f someone

i s goi ng to copy somethi ng of mi ne I shoul d do

my best to make i t educati onal , fun and hel p

soci ety. I n a worl d where compani es l i ke

Appl e and Samsung are sui ng each other i t's

pretty cl ear that progress stops when you

thi nk you can stop copyi ng. One way to l ook at

i t i s reci pes, we can al l make any di sh we l i ke

at home, but we go to restaurants for an

experi ence. That's how I l ook at hardware,

you're not j ust buyi ng the physi cal bi ts from

Adafrui t, you're getti ng the servi ce, support

and communi ty of makers. I n the future every

hardware company wi l l need to be a cause

and a busi ness, Raspberry Pi and Ardui no are

great exampl es.

TheAdafruitexclusivePibowcase

But wai t, there's more! We al so knew we'd

need a great web-based way to teach, so

we've i nvested a l ot of ti me and resources i n

bui l di ng our own i ntegrated devel opment

envi ronment (I DE) , compl ete wi th step

debuggi ng and vi sual i zer. The Raspberry Pi

WebI DE i s by far the easi est way to run code

on your Raspberry Pi . J ust connect your Pi to

your l ocal network. Then l og on to the WebI DE

i n your web browser to edi t Python, Ruby,

J avaScri pt, or anythi ng and easi l y send i t over

to your Pi . Al so, your code wi l l be versi oned i n

a l ocal gi t reposi tory, and pushed remotel y out

to bi tbucket so you can access i t from

anywhere, and any ti me. Watch the vi deo

http: //youtu. be/8N oi BBgaKCI

[MagPi] What got you i nterested i n the

Raspberry Pi ? Looki ng at www. adafrui t. com I

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