RasPi Magazine 11.pdf

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ESIGN

UILD

CODE

MOTION

FACES

AND

DETECT

drum machine

Plus

Code a

Welcome

Picamera is a fantastic library

for the Raspberry Pi camera

module, and we took a good

look at it back in issue 6, but

you can do so much more with your camera

module – and even USB cameras, if you’re

controlling them with your Raspberry Pi.

Did you know that you can set up a regular

webcam to recognise faces, for example? Or

that you can create a

Matrix-style

bullet time

effect by chaining lots of camera modules

together? We’ll show you how it’s done and

more in this special camera tricks issue of

RasPi.

And if photography isn’t your passion,

don’t worry – we’ve also got a great audio

sampler project for you, plus guides to mining

Bitcoins and volunteering CPU power. Enjoy!

Get inspired

Discover the RasPi

community’s best projects

Expert advice

Got a question? Get in touch

and we’ll give you a hand

Easy-to-follow

guides

Learn to make and code

gadgets with Raspberry Pi

Editor

From the makers of

Join the conversation at…

@linuxusermag

xusermag

Linux User & Developer

inux U

Develope

D l

RasPi@imagine-publishing.co.uk

RasPi@imagine p

Contents

Create a time-lapse camera

Shooting with your DSLR is a cinch

Detect motion with picamera

Use your camera module for home security

Turn a USB camera into a motion sensor

Add facial recognition to your surveillance setup

Bullet Pi

How to freeze time using 48 camera modules

Make a drum machine

Code a looping sampler for Pi-driven beats

What is ARM?

Exploring the brain of your Raspberry Pi

Mine Bitcoins

Find out how to dig for virtual gold

Volunteer CPU power with BOINC

Help scientists fold proteins and search for aliens

Talking Pi

Your questions answered and your opinions shared

Create a time-lapse camera

Shooting time-lapse video with your DSLR camera is a

cinch if you get Python and your Pi involved

You’d be forgiven for thinking that creating

mesmerising time-lapse videos like those

of Vincent Laforet (www.laforetvisuals.com)

or John Eklund (www.theartoftimelapse.com) might

be out of reach of the Average Joe, but with the help of

the Raspberry Pi and a sprinkling of Python code, that’s

no longer the case. In this guide we’re going to use our

Raspberry Pi to trigger our run-of-the-mill DSLR camera

(in this case a Canon EOS) to create pixel-perfect time-

lapse imagery for little more than £10. Here’s how…

THE PROJECT

ESSENTIALS

Breadboard,

connectors,

jumper wire

DSLR camera

Compatible shutter

cable

Raspbian with

Python 2.7

Set up the Raspberry Pi

For this tutorial we’re assuming you’re using a recent

build of Raspbian, which you can download from

www.raspberrypi.org/downloads.

With the Raspberry

Pi set up with a keyboard, mouse and monitor, open

the terminal and type:

$ sudo apt-get update

Install the RPi.GPIO library

Next we want to make sure your development

environment is set up. Users of Raspian should be

set up already, but you should follow these steps

anyway to make sure. In the terminal, type:

“We’re

going

to use our

Raspberry Pi

to trigger our

run-of-the-mill

DSLR camera

to create pixel-

perfect time-

lapse imagery”

$ sudo apt-get install python-dev

$ sudo apt-get install

python-rpi.gpio

Set up the Pi Cobbler

With the development environment set up,

we can turn our attention to the hardware.

For this tutorial we’ve used a cheap

prototyping breadboard and an Adafruit

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