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ISSUE 27 - OCT 2014

Get printed copies

at themagpi.com

A Magazine for Raspberry Pi Users

Game Console Controllers

FUZE BASIC

Matboard

Using Git

Ultrasonic Range Finder

C++ Operator Overloading

Build QR codes

in Minecraft

Raspberry Pi is a trademark of The Raspberry Pi Foundation.

This magazine was created using a Raspberry Pi computer.

http://www.themagpi.com

Welcome to Issue 27 of The MagPi magazine. This month's issue is packed cover to cover with

something for just about everyone!

Are you tired of controlling your Raspberry Pi with the same old mouse and keyboard? Have you ever

wished you could have the ergonomic feel of a console controller in your hands when playing some of

those retro games we have written about in past issues? If you answered yes to either of these

questions, why not take a look at Mark Routledge's fantastic article describing how to do just that.

Alec Clews talks us through the use of Git, a free version control software package that we also use

here at The MagPi to ensure that all of the team work on the most up to date copy of each issue. This is

a great read, especially if you work with any type of document or file as part of a team.

As you can see from our front cover, we return to the popular world of Minecraft in Dougie Lawson's

clever article on building QR code structures inside the game. We also have more physical computing

from ModMyPi, and a great father and son story on building and funding a Raspberry Pi project through

Kickstarter.

Of course we have not forgotten about programming. William Bell continues his popular C++ series and

we also have part three of our game programming series using FUZE BASIC. Start thinking of some

game ideas now because in the next issue we will have a game programming competition.

If you want even more from The MagPi this month then why not join us on the 1 1

October at the

SWAMP Fest event (see this month's Events page) where we will have our own stand. We look forward

to seeing you there.

We hope you enjoy this month's issue and don't forget to

like our Facebook page and leave a comment at

http://www.facebook.com/MagPiMagazine.

Chief Editor of The MagPi

The MagPi Team

Ash Stone

- Chief Editor / Administration

Ian McAlpine

- Issue Editor / Layout / Proof Reading

W.H. Bell

- Administration / Layout

Bryan Butler

- Page Design / Graphics

Matt Judge

- Website / Layout

Aaron Shaw

- Layout

Nick Hitch

- Administration

Colin Deady

- Layout / Proof Reading

Dougie Lawson

- Testing

Nick Liversidge

- Proof Reading

Age-Jan (John) Stap

- Layout

Contents

CHOOSE YOUR WEAPON

or Wiimote controller to a Raspberry Pi

Connecting an XBOX360, PS3

1 2

THE MATBOARD PROJECT

A story of Kickstarter, GPIO and water buckets

1 8

PHYSICAL COMPUTING

Part 3: Using an HC-SR04 ultrasonic range finder

THIS

Bristol

MONTH'S EVENTS GUIDE

UK, London UK

UK, Swansea UK, Huddersfield

PI EDITION

MINECRAFT

structures inside Minecraft

Build QR Code

VERSION CONTROL

using Git

Part 1 : Version control basics

BASIC

FUZE

Keyboard input, animation and arrays

Part 3:

CACHE

C++

7: Operator overloading

Part

HAVE YOUR SAY

and article ideas

Send us your feedback

http://www.themagpi.com

CHOOSE YOUR WEAPON

Adding console game controllers

Connecting an XBOX360, PS3 or

Wiimote controller to a Raspberry Pi

SKILL LEVEL : INTERMEDIATE

Choose your Weapon

It is possible, and lots of fun, to use a variety of

today's modern console controllers for your

Raspberry Pi projects. They are quite easy to

install, readily available and you get quite a bit of

kit for your buck! This article describes how to

setup a Raspberry Pi to use a Microsoft® XBOX

360 gamepad (wired and wireless), a Sony®

PS3 gamepad and Nintendo® Wiimote.

For wireless devices you will need either the

XBOX gamepad wireless adapter, or for the

Wiimote and PS3 gamepad you can use an

expensive bluetooth dongle. See

http://www.

elinux.org/RPi_USB_Bluetooth_adapters

for a

list of known working bluetooth dongles.

I have tested all the code on a Raspberry Pi

Model B, as well as on the new Model B+ board.

Before installing any of the software ensure you

are using a recent version of Raspbian and have

updated your system. At the command line enter:

sudo apt-get update

sudo apt-get upgrade

Mark Routledge

Guest Writer

Enter the following command to install the

software:

sudo apt-get i nstal l j stest-gtk j oysti ck

This program should now show up in your

desktop ready for you to test. You will find the

link under

→

Other

→

j oysti ck testi ng

and confi gurati on tool

Once installed it should display your hardware

for example: Connecting your hardware.

A brief note about using the bluetooth adapter. I

have found these can be a little tempremental at

times, so I strong recommend connecting your

dongle directly to the Raspberry Pi and connect

any other hardware via a powered USB hub, e.g.

the excellent Raspberry Pi Hub! The bluetooth

dongle will work from a powered hub on a low

level, but the bluetooth stack may not be able to

see it.

Setting up the XBOX gamepad

First open up LXTerminal and install the required

driver for the XBOX 360 gamepad. The same

driver is used for both the wired gamepad and

wireless gamepad, using the adapter. Enter:

sudo apt-get i nstal l xboxdrv

To test all of the hardware, an easy piece of

software to use on the Raspberry Pi is

j stest-

gtk

and the standard

j oysti ck

library.

It is possible to now use the XBOX gamepad with

a variety of Linux games by using:

sudo xboxdrv --si l ent

However, this does not really give you much

control over what each axis / button does. You

can use the

j oysti ck

testi ng

and

confi gurati on tool

mentioned earlier but it

can be difficult to get setup. Luckily it is possible

to configure the XBOX gamead in a variety of

ways. Each configuration requires a setup (text)

file which you provide when launching the

gamepad and driver. Through this you can turn

one of the analogue sticks into a mouse and the

buttons into keypresses etc. This will make it

usable with programs like Minecraft, Doom,

Quake3 plus all known emulators. The

possibilities are endless, and exciting.

Let us make a directory to store these setup files,

which contain the button mappings. Enter:

cd ~

mkdi r XBOX

cd XBOX

configuration text file called

basi c_confi g

. You can use any editor, but

nano

is quick and simple. Enter:

nano basi c_confi g

Create

Now enter the following mappings:

#----------------------------------------

# Thi s fi l e i s the Basi c Defi ni ti on of

# the control l er, al l owi ng a deadzone.

# It wi l l run si l entl y.

#----------------------------------------

# Setup the DPad as buttons and tri ggers.

[xboxdrv]

si l ent=true

deadzone=6000

dpad-as-button=true

tri gger-as-button=true

#----------------------------------------

# Map the ri ght anal og sti ck as absol ute

# val ues (x2 and y2) and the l eft anal og

# sti ck as mouse rel ati ve (x1 and y1).

[ui -axi smap]

x2=ABS_X

y2=ABS_Y

x1=REL_X: 10

y1=REL_Y: -10

# ---------------------------------------

# Map the four col oured buttons a, b, x

# and y and set each one as a di fferent

# key, or equi val ent j oysti ck button.

# In thi s case Left Shi ft, j oysti ck

# buttons C and A and the key C.

# Map the tri ggers and bumpers i n the

# same way; l t, rt, l b and rb.

# Map the DPad du, dl , dd, dr as WASD.

# Map the Back, Start and Gui de (XBOX)

# buttons to Home, Escape and Enter.

[ui -buttonmap]

a=KEY_LEFTSHIFT

b=BTN_C

x=BTN_A

y=KEY_C

l b=KEY_LEFT

rb=KEY_RIGHT

l t=KEY_Z

rt=KEY_SPACE

dl =KEY_A

dr=KEY_D

du=KEY_W

dd=KEY_S

gui de=KEY_HOME

back=KEY_ESC

start=KEY_ENTER

#--------------- EOF --------------------

Save and close the configuration file and exit

from

nano

by pressing the <Ctrl>+<X> keys

together, followed by the <Y> key then <Enter>.

Description of the XBOX config file

This file is the basic definition of the controller,

allowing a deadzone. It will run silently, meaning

it will not output additional information to the

terminal.

The file sets up the DPad as buttons and

triggers. The next few sections are used to map

the right analogue stick as absolute values on the

x2 and y2 axes and the left analogue stick as

mouse relative values on the x1 and y1 axes.

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