Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Book Image

Raspberry Pi for Python Programmers Cookbook - Second Edition

Overview of this book

Raspberry Pi cookbook for Python Programmers is a practical guide for getting the most out of this little computer. This book begins by guiding you through setting up the Raspberry Pi, performing tasks using Python 3 and introduces the first steps to interface with electronics. As you work through each chapter you will build up your skills and knowledge and apply them as you progress throughout the book, delving further and further into the unique abilities and features of the Raspberry Pi. Later, you will learn how to automate tasks by accessing files, build applications using the popular Tkinter library and create games by controlling graphics on screen. You will harness the power of the built-in graphics processor by using Pi3D to generate your own high quality 3D graphics and environments. Connect directly to the Raspberry Pi’s hardware pins to control electronics from switching on LEDs and responding to push buttons right through to driving motors and servos. Learn how to monitor sensors to gather real life data and to use it to control other devices, and view the results over the Internet. Apply what you have learnt by creating your own Pi-Rover or Pi-Hexipod robots. Finally, we will explore using many of the purpose built add-ons available for the Raspberry Pi, as well as interfacing with common household devices in new ways.
Table of Contents (18 chapters)
Raspberry Pi for Python Programmers Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Hardware and Software List
Index

Generating a time-lapse video


Having a camera attached to a computer provides us with a great way to take pictures at controlled intervals and automatically process them into a video to create a time-lapse sequence. The pycamera Python module has a special capture_continuous() function that will create a series of images. For the time-lapse video, we will specify the time between each image and the total number of images that need to be taken. To help the user, we will also calculate the overall duration of the video to provide an indication of how long it will take.

We shall add to our previous GUI interface to provide controls to run time lapses and also automatically generate a video clip from the results. The GUI will now look similar to the following screenshot:

The time-lapse application

Getting ready

You will need everything set up as it was for the previous example, including the cameraGUI.py file that we created in the same directory and pycamera, which we installed. We shall also...