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HARDWARE HACKING AND THE RASPBERRY PI;
WHAT'S JAVASCRIPT GOT TO DO WITH IT?
ALEX ROCHE
@alexHacked
HARDWARE HACKING; WAT?
HARDWARE HACKING; WAT?
• We

take electronics and bend them to our will
HARDWARE HACKING; WAT?
• We

take electronics and bend them to our will



• Can

use any component, as long as it can be soldered
HARDWARE HACKING; WAT?
• We

take electronics and bend them to our will



• Can

use any component, as long as it can be soldered



•A

variety of levels of difficulty and accessibility
HARDWARE HACKING; WHY?
HARDWARE HACKING; WHY?
• Prototyping

concepts and systems
HARDWARE HACKING; WHY?
• Prototyping

concepts and systems



• Replacing

older tech that has failed
HARDWARE HACKING; WHY?
• Prototyping

concepts and systems



• Replacing

older tech that has failed



• Making

something cool
HARDWARE HACKING; HOW?
HARDWARE HACKING; HOW?
•A

basic knowledge of electronics is definitely helpful
HARDWARE HACKING; HOW?
•A

basic knowledge of electronics is definitely helpful

• Skills

such as soldering and stripping wires
HARDWARE HACKING; HOW?
•A

basic knowledge of electronics is definitely helpful

• Skills

such as soldering and stripping wires

• GPIO

pins; GPIO pins everywhere!
HARDWARE HACKING; HOW?
•A

basic knowledge of electronics is definitely helpful

• Skills

such as soldering and stripping wires

• GPIO
• No

pins; GPIO pins everywhere!

'correct' or 'right' way
HARDWARE HACKING; HOW?
•A

basic knowledge of electronics is definitely helpful

• Skills

such as soldering and stripping wires

• GPIO
• No
• Be

pins; GPIO pins everywhere!

'correct' or 'right' way

safe and have respect for electricity
HARDWARE HACKING; WHEN?
HARDWARE HACKING; WHEN?
• Creating

projects to react solely to electricity
HARDWARE HACKING; WHEN?
• Creating
• Using

projects to react solely to electricity

timing chips, resistors and circuit boards
HARDWARE HACKING; WHEN?
• Creating
• Using

projects to react solely to electricity

timing chips, resistors and circuit boards

• Programmable

micro controllers
HARDWARE HACKING; WHEN?
• Creating
• Using

projects to react solely to electricity

timing chips, resistors and circuit boards

• Programmable

micro-controllers

• Micro-controllers

on an integrated platform
ALL THE OPTIONS!
•A

lot of options for a lot of different skill levels
ALL THE OPTIONS!
•A

lot of options for a lot of different skill levels

• Little

Bits
ALL THE OPTIONS!
•A

lot of options for a lot of different skill levels

• Little

Bits

• Makey

Makey
ALL THE OPTIONS!
•A

lot of options for a lot of different skill levels

• Little

Bits

• Makey

Makey

• Arduino
ALL THE OPTIONS!
•A

lot of options for a lot of different skill levels

• Little

Bits

• Makey

Makey

• Arduino
• Raspberry

Pi
LITTLE BITS
LITTLE BITS
LITTLE BITS
• Individual, pre-formed

components
LITTLE BITS
• Individual, pre-formed

components


• Held

together with magnets
LITTLE BITS
• Individual, pre-formed

components


• Held

together with magnets



• Different

colours to help
design a circuit
LITTLE BITS; A BIT USEFUL?
LITTLE BITS; A BIT USEFUL?
• Extremely

Modular
LITTLE BITS; A BIT USEFUL?
• Extremely

Modular

• Incredibly

Hands On
LITTLE BITS; A BIT USEFUL?
• Extremely

Modular

• Incredibly

Hands On

• Makes

exploring hardware
simple and fun
LITTLE BITS; A BIT USEFUL?
• Extremely

Modular

• Incredibly

Hands On

• Makes

exploring hardware
simple and fun

• Best

for proof of concepts and
toying with new ideas
MAKEYMAKEY
MAKEYMAKEY
• Plug

and Play with your
computer
MAKEYMAKEY
• Plug

and Play with your
computer


• Acts

as a Keyboard
MAKEYMAKEY
• Plug

and Play with your
computer


• Acts

as a Keyboard



• Plug

and clip wires in to the
board to complete a circuit
MAKEYMAKEY;
MAKES THINGS COOL?
MAKEYMAKEY;
MAKES THINGS COOL?
• Binary

Input
MAKEYMAKEY;
MAKES THINGS COOL?
• Binary

Input



• Easy

way to hack together
basic interaction
MAKEYMAKEY;
MAKES THINGS COOL?
• Binary

Input



• Easy

way to hack together
basic interaction


• Key

Events can be used to
detect interaction
ARDUINO
ARDUINO
• Microcontroller

circuitboard

on a
ARDUINO
• Microcontroller

circuitboard
• GPIO

pins

on a
ARDUINO
• Microcontroller

on a

circuitboard
• GPIO

pins

• Programmable

over USB
ARDUINO
• Microcontroller

on a

circuitboard
• GPIO

pins

• Programmable
• Can

over USB

run Javascript and NodeJS
ARDUINO; OPEN SOURCE
MEANS OPEN OPTIONS
ARDUINO; OPEN SOURCE
MEANS OPEN OPTIONS
• Arduino

UNO
ARDUINO; OPEN SOURCE
MEANS OPEN OPTIONS
• Arduino

UNO

• Arduino

Mega
ARDUINO; OPEN SOURCE
MEANS OPEN OPTIONS
• Arduino

UNO

• Arduino

Mega

• Arduino

Lilypad
ARDUINO; OPEN SOURCE
MEANS OPEN OPTIONS
• Arduino

UNO

• Arduino

Mega

• Arduino

Lilypad

• Open

Source; can be
reproduced by anybody with
the right components
ARDUINO; HOW TO CODE
ARDUINO; HOW TO CODE
• IDE

based on translating
simple code to C++
ARDUINO; HOW TO CODE
• IDE

based on translating
simple code to C++ 


• BreakoutJS; Javascript

Browser interactivity

and Web
ARDUINO; HOW TO CODE
• IDE

based on translating
simple code to C++ 


• BreakoutJS; Javascript

and Web

Browser interactivity


• Johnny

Five; Node based
framework
RASPBERRY PI; TASTY!
RASPBERRY PI; TASTY!
•A

computer (and then some)
RASPBERRY PI; TASTY!
•A

computer (and then some)

• GPIO

pins
RASPBERRY PI; TASTY!
•A

computer (and then some)

• GPIO
• Has

pins

all the hardware needed
for a computer onboard
RASPBERRY PI; TASTY!
•A

computer (and then some)

• GPIO

pins

• Has

all the hardware needed
for a computer onboard

• Runs

a boatload of operating
systems
RASPBERRY PI; TASTY!
•A

computer (and then some)

• GPIO

pins

• Has

all the hardware needed
for a computer onboard

• Runs

a boatload of operating
systems

• GPIO

pins are easily
addressable
RASPBERRY PI; CHOICES!
RASPBERRY PI; CHOICES!
• Two

Different Types
RASPBERRY PI; CHOICES!
• Two

Different Types



• Model A
RASPBERRY PI; CHOICES!
• Two

Different Types



• Model A


• Model

B
RASPBERRY PI; MODEL A
RASPBERRY PI; MODEL A
• Single

USB
RASPBERRY PI; MODEL A
• Single

USB

• 256MB

RAM
RASPBERRY PI; MODEL A
• Single

USB

• 256MB
• Audio

RAM

& RCA video output
RASPBERRY PI; MODEL A
• Single

USB

• 256MB

RAM

• Audio

& RCA video output

• HDMI

output
RASPBERRY PI; MODEL A
• Single

USB

• 256MB

RAM

• Audio

& RCA video output

• HDMI

output

• 26

GPIO pins
RASPBERRY PI; MODEL A
• Single

USB

• 256MB

RAM

• Audio

& RCA video output

• HDMI

output

• 26

GPIO pins

• Runs

Minecraft!
RASPBERRY PI; MODEL B
RASPBERRY PI; MODEL B
•2

USB Connectors
RASPBERRY PI; MODEL B
•2

USB Connectors

• 512MB

RAM
RASPBERRY PI; MODEL B
•2

USB Connectors

• 512MB

RAM

• Ethernet

Jack
RASPBERRY PI; MODEL B
•2

USB Connectors

• 512MB

RAM

• Ethernet
• 34

Jack

GPIO pins
RASPBERRY PI; MODEL B
•2

USB Connectors

• 512MB

RAM

• Ethernet
• 34

Jack

GPIO pins

• Additional

8 are mostly
unused; supply power and
ground
RASPBERRY PI; GPIO MAPPING
RASPBERRY PI; GPIO MAPPING
RASPBERRY PI; GPIO MAPPING
RASPBERRY PI; WHY?
RASPBERRY PI; WHY?
• More

Processing Power
RASPBERRY PI; WHY?
• More

Processing Power

• Onboard

Storage
RASPBERRY PI; WHY?
• More

Processing Power

• Onboard

Storage

• Freedom

of Language Choice
RASPBERRY PI; WHY?
• More

Processing Power

• Onboard

Storage

• Freedom

of Language Choice

• Easily

configured Internet
Access
RASPBERRY PI; WHY?
• More

Processing Power

• Onboard

Storage

• Freedom

of Language Choice

• Easily

configured Internet
Access

• Runs

any code you write for it
on the board instead of
tethered to a computer
RASPBERRY PI; WHY NOT?
• Less

battery life than an
Arduino
RASPBERRY PI; WHY NOT?
• Less

battery life than an
Arduino


• Can

be cumbersome to set up
and program
RASPBERRY PI; WHY NOT?
• Less

battery life than an
Arduino


• Can

be cumbersome to set up
and program


• Doesn’t

have as much of a
support for shields
SHIELDS?
SHIELDS?
• Pre

created circuit boards that extend functionality
SHIELDS?
• Pre

created circuit boards that extend functionality



• Can

use multiple shields at once ...
SHIELDS?
• Pre

created circuit boards that extend functionality



• Can

use multiple shields at once ...



• ... though

like using multiple of anything at once, take care.
NODE; WHAT IS IT?
NODE; WHAT IS IT?
•A

familiar flavour of Javascript; people already know it!
NODE; WHAT IS IT?
•A

familiar flavour of Javascript; people already know it!

• Non

Blocking I/O
NODE; WHAT IS IT?
•A

familiar flavour of Javascript; people already know it!

• Non

Blocking I/O

• Event

Driven using callbacks
NODE; WHAT IS IT?
•A

familiar flavour of Javascript; people already know it!

• Non

Blocking I/O

• Event

Driven using callbacks

• Operating

System Agnostic (mostly)
NODE; WHY IS IT COOL?
NODE; WHY IS IT COOL?
• Incorporates

Google’s V8 Engine for speed
NODE; WHY IS IT COOL?
• Incorporates
• Has

Google’s V8 Engine for speed

some really fun functions
NODE; WHY IS IT COOL?
• Incorporates
• Has

Google’s V8 Engine for speed

some really fun functions

• Crypto, OS, FS
NODE; WHY IS IT COOL?
• Incorporates
• Has
•

Google’s V8 Engine for speed

some really fun functions

Crypto, OS, FS

• Has

a massive amount of external libraries to augment it
NODE; WHY IS IT COOL?
• Incorporates
• Has
•

some really fun functions

Crypto, OS, FS

• Has
•A

Google’s V8 Engine for speed

a massive amount of external libraries to augment it

server side language front end developers can write!
NODE; HOW TO INSTALL?
LINUX
NODE; HOW TO INSTALL?
LINUX
> wget http://nodejs.org/dist/v.0.8.11/nodev0.8.11.tar.gz


>
>
>
>
>

tar -zxf node-v0.8.11.tar.gz
cd node-v0.8.11
./configure
make
sudo make install
NODE; HOW TO INSTALL?
MAC & WINDOWS
NODE; HOW TO INSTALL?
MAC & WINDOWS
• Much

more simple and straightforward than Linux
NODE; HOW TO INSTALL?
MAC & WINDOWS
• Much

more simple and straightforward than Linux



• Go

get the installer from nodejs.org/download/
NODE; HOW TO INSTALL?
MAC & WINDOWS
• Much

more simple and straightforward than Linux



• Go

get the installer from nodejs.org/download/



• No, really. Download

it from there and install it. Job done.
NODE; HOW TO INSTALL?
MAC & WINDOWS
• Much

more simple and straightforward than Linux



• Go

get the installer from nodejs.org/download/



• No, really. Download

it from there and install it. Job done.
NODE; HOW TO USE?
NODE; HOW TO USE?
• Write

JavaScript!
NODE; HOW TO USE?
• Write

JavaScript!



• Watch

out for the PHP-esque require(“”); though!
NODE; HOW TO USE?
• Write

JavaScript!



• Watch

out for the PHP-esque require(“”); though!



• Make

use of the inbuilt libraries in NodeJS
NPM;
NOT PROBLEMATIC, MOSTLY
NPM;
NOT PROBLEMATIC, MOSTLY
• Nodes

inbuilt library management tool
NPM;
NOT PROBLEMATIC, MOSTLY
• Nodes

inbuilt library management tool



• Has

its own website listing all of the modules
NPM;
NOT PROBLEMATIC, MOSTLY
• Nodes

inbuilt library management tool



• Has

its own website listing all of the modules



• Makes

it incredibly easy to install modules
NPM; HOW TO USE
NPM; HOW TO USE
• It

all starts with npm
NPM; HOW TO USE
• It

all starts with npm

• Different

Keywords; https://npmjs.org/docs
NPM; HOW TO USE
• It

all starts with npm

• Different
• Most

Keywords; https://npmjs.org/docs

useful are install and update
NPM; HOW TO USE
• It

all starts with npm

• Different

Keywords; https://npmjs.org/docs

• Most

useful are install and update

• npm

install || npm update
NPM; INSTALLING A MODULE
NPM; INSTALLING A MODULE
• Find

the package you want to install on the npm site
NPM; INSTALLING A MODULE
• Find

the package you want to install on the npm site

• Run

npm install gpio to install the package
NPM; INSTALLING A MODULE
• Find

the package you want to install on the npm site

• Run

npm install gpio to install the package

• -g

flag installs globally instead of locally for command line use
NPM; INSTALLING A MODULE
• Find

the package you want to install on the npm site

• Run

npm install gpio to install the package

• -g

flag installs globally instead of locally for command line use

• require(“gpio”);

in your project
NPM; INSTALLING A MODULE
• Find

the package you want to install on the npm site

• Run

npm install gpio to install the package

• -g

flag installs globally instead of locally for command line use

• require(“gpio”);
• npm

in your project

packages need to be installed in each project’s folder you
intend to use them in
BAKING A RASPBERRY PI
BAKING A PI
• We

have a lot of choices for the operating system
BAKING A PI
• We

have a lot of choices for the operating system

• Linux
BAKING A PI
• We

have a lot of choices for the operating system

• Linux
• RISC
BAKING A PI
• We

have a lot of choices for the operating system

• Linux
• RISC
• Android
BAKING A PI
• We

have a lot of choices for the operating system

• Linux
• RISC
• Android
• FirefoxOS
COOKING THE FILLING

•ç
COOKING THE FILLING
• Windows
• Win32DiskImager
COOKING THE FILLING
• Windows
• Win32DiskImager
• Mac
• RPI

sd card builder, PiWriter, Pi Filler
COOKING THE FILLING
• Windows
• Win32DiskImager
• Mac
• RPI

sd card builder, PiWriter, Pi Filler

• Linux
• ImageWriter
COOKING THE FILLING
• Windows
• Win32DiskImager
• Mac
• RPI

sd card builder, PiWriter, Pi Filler

• Linux
• ImageWriter
COOKING THE FILLING
• Windows
• Win32DiskImager
• Mac
• RPI

sd card builder, PiWriter, Pi Filler

• Linux
• ImageWriter
CUTTING IN TO THE PI
CUTTING IN TO THE PI
• First

off, we install Adafruit’s Occidentalis distribution
CUTTING IN TO THE PI
• First

off, we install Adafruit’s Occidentalis distribution



• We

SSH in to the Raspberry Pi
CUTTING IN TO THE PI
• First

off, we install Adafruit’s Occidentalis distribution



• We

SSH in to the Raspberry Pi



• We

connect it to a monitor with keyboard and mouse
CUTTING IN TO THE PI; SSH
CUTTING IN TO THE PI; SSH
• Power

it up!
CUTTING IN TO THE PI; SSH
• Power
• Plug

it up!

an Ethernet cable in to your Pi and your Router
CUTTING IN TO THE PI; SSH
• Power
• Plug
• Run

it up!

an Ethernet cable in to your Pi and your Router

ssh raspberrypi.local on your computer to get
to the Pi
CUTTING IN TO THE PI; SSH
• Power
• Plug

it up!

an Ethernet cable in to your Pi and your Router

• Run

ssh raspberrypi.local on your computer to get
to the Pi

• Alternatively

log in to your router and get the IP of the Pi from
there; ssh pi@<ip_of_pi> . Use the password
“raspberry”
WIRED IS BORING, RIGHT?!
LETS GO WIRELESS!
CUTTING THE PI LOOSE
CUTTING THE PI LOOSE
• Run

sudo nano /etc/
network/interfaces
CUTTING THE PI LOOSE
• Run

sudo nano /etc/
network/interfaces

• Delete

file

the contents of the
CUTTING THE PI LOOSE
> auto lo


> iface lo inet loopback
> iface eth0 inet dhcp


> allow-hotplug wlan0
> auto wlan0



> iface wlan0 inet dhcp
>    wpa-ssid "ssid"
>    wpa-psk "password"

• Run

sudo nano /etc/
network/interfaces

• Delete

the contents of the

file 
• <-

Replace it with this
CUTTING THE PI LOOSE
> auto lo


> iface lo inet loopback
> iface eth0 inet dhcp


> allow-hotplug wlan0
> auto wlan0

• Run

sudo nano /etc/
network/interfaces

• Delete

the contents of the

file 




• <-

> iface wlan0 inet dhcp
>    wpa-ssid "ssid"
>    wpa-psk "password"

• Replace

Replace it with this

SSID and
PASSWORD
BLOWING RASPBERRIES
BLOWING RASPBERRIES

GPIO
API; https://npmjs.org/package/
gpio
Manual Setting and Getting
BLOWING RASPBERRIES
GPIO

Johnny-Five

API; https://npmjs.org/package/
gpio

API; https://github.com/
rwaldron/johnny-five/wiki

Manual Setting and Getting
for Raspberry Pi

Function Based System for
Arduino
BLOWING RASPBERRIES;
SETTING UP A CONTEXT
BLOWING RASPBERRIES;
SETTING UP A CONTEXT
GPIO

> var gpio = require("gpio");
>
>/* Calling export with a pin
>number will export that header
>and return a gpio header
>instance*/
>
> var gpio4 = gpio.export(4, {
>      direction: 'out',
>   
interval: 200,
>     ready: function() {
>   
}
>});
BLOWING RASPBERRIES;
SETTING UP A CONTEXT
GPIO

Johnny-Five


> var gpio = require("gpio");
>
>/* Calling export with a pin
>number will export that header
>and return a gpio header
>instance*/
>
> var gpio4 = gpio.export(4, {
>      direction: 'out',
>   
interval: 200,
>     ready: function() {
>   
}
>});


> var five = require("johnnyfive"), board, led;
>
> board = new five.Board();
>
>board.on("ready", function() {
});
BLOWING RASPBERRIES;
MAKING A LIGHT BLINK
BLOWING RASPBERRIES;
MAKING A LIGHT BLINK
GPIO

>Var strobeTimer =
setInterval(function() {
> gpio4.set();         
>
setTimeout(
>
function(){ 
>
gpio4.reset(); 
>
}, 200);
>
}, 400);
>/*Can also pass a number in to >the
>set function.*/
BLOWING RASPBERRIES;
MAKING A LIGHT BLINK
GPIO

Johnny-Five




>  /* Create a standard `led`
>hardware instance*/
>  Var led = new five.Led(13);
>
>  /* "strobe" the led in 100ms
>on-off phases*/
>  led.strobe( 100 );

>Var strobeTimer =
setInterval(function() {
> gpio4.set();         
>
setTimeout(
>
function(){ 
>
gpio4.reset(); 
>
}, 200);
>
}, 400);
>/*Can also pass a number in to >the
>set function.*/
BLOWING RASPBERRIES;
GETTING VALUES
BLOWING RASPBERRIES;
GETTING VALUES
GPIO

>var gpio = require("gpio");
>var gpio4 = gpio.export(4, {
>   direction: "in",
>   ready: function() {
>
Console.log(gpio4.value
>   }
>});
BLOWING RASPBERRIES;
GETTING VALUES
GPIO

Johnny-Five


>var gpio = require("gpio");
>var gpio4 = gpio.export(4, {
>   direction: "in",
>   ready: function() {
>
Console.log(gpio4.value
>   }
>});


>new five.Pin(13).query(
>function(state) {
>  console.log(state);
>});
BLOWING RASPBERRIES;
SETTING VALUES
BLOWING RASPBERRIES;
SETTING VALUES
GPIO

> gpio4.set(function()
>{ console.log(gpio4.value);
>});
BLOWING RASPBERRIES;
SETTING VALUES
GPIO

> gpio4.set(function()
>{ console.log(gpio4.value);
>});

Johnny-Five

Nothing explicit; is accomplished by passing
values straight in to the functions
FINAL HINTS AND TIPS
• Once

client

connected so you can SSH in to it, use a file transfer
FINAL HINTS AND TIPS
• Once

connected so you can SSH in to it, use a file transfer

client
• Helpful

the PI

if the GPIO pins are labeled using the paper overlay for
FINAL HINTS AND TIPS
• Once

connected so you can SSH in to it, use a file transfer

client
• Helpful

if the GPIO pins are labeled using the paper overlay
for the PI

• Get

a ribbon cord for the Pi; will make your life easier.
HE’S STILL NOT FINISHED?
• Not

everything has to be written in NodeJS
HE’S STILL NOT FINISHED?
• Not

everything has to be written in NodeJS

• Is, however, an

developers

accessible starting point for front end
HE’S STILL NOT FINISHED?
• Not

everything has to be written in NodeJS

• Is, however, an

accessible starting point for front end

developers
• Projects

don’t need to be in the same language
HE’S STILL NOT FINISHED?
• Not

everything has to be written in NodeJS

• Is, however, an

accessible starting point for front end

developers
• Projects

don’t need to be in the same language

• Important

that what you’ve written works
MAYBE HE NEARLY IS?
• Don’t

be afraid; there’s always help at hand!
MAYBE HE NEARLY IS?
• Don’t

be afraid; there’s always help at hand!

• Don’t

expect to not learn anything during the project!
MAYBE HE NEARLY IS?
• Don’t

be afraid; there’s always help at hand!

• Don’t

expect to not learn anything during the project!

• Have

fun with your project!
MAYBE HE NEARLY IS?
• Don’t

be afraid; there’s always help at hand!

• Don’t

expect to not learn anything during the project!

• Have

fun with your project!

• Be

Careful!
THANK YOU!
RESOURCES
• Node; nodejs.org/downloads/
• NPM; npmjs.org
• NodeSchool; nodeschool.io
• Adafruit

Industries; http://learn.adafruit.com/category/learnraspberry-pi

• RS-Components; uk.rs-online.com
• Farnell; uk.farnell.com

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