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Raspberry Pi 3 Cookbook for Python Programmers

Raspberry Pi 3 Cookbook for Python Programmers

By : Steven Lawrence Fernandes, Tim Cox
3.8 (10)
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Raspberry Pi 3 Cookbook for Python Programmers

Raspberry Pi 3 Cookbook for Python Programmers

3.8 (10)
By: Steven Lawrence Fernandes, Tim Cox

Overview of this book

Raspberry Pi 3 Cookbook for Python Programmers – Third Edition begins by guiding you through setting up Raspberry Pi 3, performing tasks using Python 3.6, and introducing the first steps to interface with electronics. As you work through each chapter, you will build your skills and apply them as you progress. You will learn how to build text classifiers, predict sentiments in words, develop applications using the popular Tkinter library, and create games by controlling graphics on your screen. You will harness the power of a built in graphics processor using Pi3D to generate your own high-quality 3D graphics and environments. You will understand how to connect Raspberry Pi’s hardware pins directly to control electronics, from switching on LEDs and responding to push buttons to driving motors and servos. Get to grips with monitoring sensors to gather real-life data, using it to control other devices, and viewing the results over the internet. You will apply what you have learned by creating your own Pi-Rover or Pi-Hexipod robots. You will also learn about sentiment analysis, face recognition techniques, and building neural network modules for optical character recognition. Finally, you will learn to build movie recommendations system on Raspberry Pi 3.
Table of Contents (17 chapters)
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Avoiding objects and obstacles


To avoid obstacles, you can place sensors around the robot's perimeter to activate whenever an object is encountered. Depending on how you want your robot to behave, one avoidance strategy is to just reverse any action last taken (with an additional turn for forward/backward actions) that caused one of the sensors to be activated.

Getting ready

You will need some micro switches to be triggered when there is an impact with objects. Depending on the type you have, you need to place enough switches to detect any object around the outside (if required, you can use an additional length of wire to extend the reach of the switch). Shown in the following photo are two possible sensors that will cause the switch to activate when the spring or the metal arm hits an object. You need to determine which contacts of the switch open or close the circuit (this will depend on the device):

Small micro switches can be used as collision sensors

How to do it...

Connect the switches...

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