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Raspberry Pi for Secret Agents

Raspberry Pi for Secret Agents

By : Stefan Sjogelid
4.1 (20)
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Raspberry Pi for Secret Agents

Raspberry Pi for Secret Agents

4.1 (20)
By: Stefan Sjogelid

Overview of this book

Ever wished you could play around with all the neat gadgets your favorite spies use (like James Bond or Michael Westen)? With the introduction of the remarkable Raspberry Pi and a few USB accessories, anybody can now join in on the action.Discover how to turn your Raspberry Pi into a multipurpose secret agent tool! Through a series of fun, easy-to-follow projects you'll learn how to set up audio/video surveillance, explore your Wi-Fi network, play pranks on your friends, and even learn how to free your Raspberry Pi from the constraints of the wall socket.Raspberry Pi for Secret Agents starts out with the initial setup of your Raspberry Pi, guides you through a number of pranks and secret agent techniques, and then shows you how to apply what you've learned out in the real world. Learn how to configure your operating system for maximum mischief and start exploring the audio, video, and Wi-Fi projects. Learn how to record, listen, or talk to people from a distance and how to distort your voice. You can even plug in your webcam and set up a motion detector with an alarm, or find out what the other computers on your Wi-Fi network are up to. Once you've mastered the techniques, combine them with a battery pack and GPS for the ultimate off-road spy kit.
Table of Contents (12 chapters)
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Raspberry Pi for Secret Agents
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Scheduling your audio actions


In this section, we'll be looking at different techniques of triggering a recording or a playback and optionally how to make it stop after a certain period of time.

Start on power up

The first method we'll cover is also the most blunt—how to start a recording or playback directly when powering up the Raspberry Pi. There isn't really a standardized way of auto-starting regular user applications on boot, so we'll have to improvise a bit to come up with our own way of doing what we want.

The Raspbian boot process is basically a collection of shell scripts being run one after the other, each script performing some important task. One of the last scripts to run is /etc/rc.local, which is a good starting point for our custom autorun solution. Right now, the script doesn't do much, just prints out the IP address of the Pi.

You can try running the script any time using the following command:

pi@raspberrypi ~ $ /etc/rc.local

We could just jam our list of commands right in...

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