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

Using built-in Wi-Fi and Bluetooth on the Raspberry Pi


Many home networks provide a wireless network over Wi-Fi; if you have a Raspberry Pi 3, then you can make use of the on-board Broadcom Wi-Fi to connect to it. The Raspberry Pi 3 also supports Bluetooth, so you can connect most standard Bluetooth devices and use them like you would on any other computer.

This method should also work for any supported USB Wi-Fi and Bluetooth devices, see the Networking and connecting your Raspberry Pi to the Internet via a USB Wi-Fi dongle recipe for extra help on identifying device and installing firmware (if required).

Getting ready

The latest version of Raspbian includes helpful utilities to quickly and easily configure your Wi-Fi and Bluetooth through the graphical interface.

Note

Note: If you need to configure the Wi-Fi via the command line, then see the Networking and connecting your Raspberry Pi to the Internet via a USB Wi-Fi dongle recipe for details.

Wi-Fi and Bluetooth configuration applications

You can use the built-in Bluetooth to connect a wireless keyboard, a mouse or even wireless speakers. This can be exceptionally helpful for projects where additional cables and wires are an issue, such as robotic projects, or when the Raspberry Pi is installed in hard-to-reach locations (acting as a server or security camera).

How to do it…

Connecting to your Wi-Fi network

To configure your Wi-Fi connection, click on the networking symbol to list the local available Wi-Fi networks:

Wi-Fi listing of the available access points in the area

Select the required network (for example, Demo) and if required enter your password (also known as Pre Shared Key):

Providing the password for the access point

After a short while, you should see that you have connected to the network and the icon will change to a Wi-Fi symbol. If you encounter problems, ensure you have the correct password/key.

Successful connection to an access point

That is it, as easy as that!

You can now test your connection and ensure it is working by using the web browser to navigate to a website or by using the following command in the terminal:

sudo ping www.raspberrypi.com

Connecting to Bluetooth devices

To start, we need to put the Bluetooth device into discoverable mode, by clicking on the Bluetooth icon and selecting Make Discoverable. You will also need to make the device you want to connect to discoverable and ready to pair; this may vary from device to device (such as pressing a pairing button).

Set the Bluetooth as discoverable

Next, select Add Device... and select the target device and Pair:

Select and pair the required device

The pairing process will then start; for example, the BTKB-71DB keyboard will need the pairing code 467572 to be entered onto the keyboard for the pairing to complete. Other devices may use default pairing codes, often set to 0000, 1111, 1234, or similar.

Follow the instructions to pair the device with the required pairing code

Once the process has completed, the device will be listed and will connect automatically each time the devices are present and booted.