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Python Programming with Raspberry Pi

By : Sai Yamanoor, Srihari Yamanoor

Python Programming with Raspberry Pi

By: Sai Yamanoor, Srihari Yamanoor

Overview of this book

Raspberry Pi Zero is a super-small and super-affordable product from Raspberry Pi that is packed with a plethora of features and has grabbed the notice of programmers, especially those who use Python. This step-by-step guide will get you developing practical applications in Python using a Raspberry Pi Zero. It will become a valuable resource as you learn the essential details of interfacing sensors and actuators to a Raspberry Pi, as well as acquiring and displaying data. You will get started by writing a Python program that blinks an LED at 1-second intervals. Then you will learn to write simple logic to execute tasks based upon sensor data (for example, to control a motor) and retrieve data from the web (such as to check e-mails to provide a visual alert). Finally, you will learn to build a home automation system with Python where different appliances are controlled using the Raspberry Pi. The examples discussed in each chapter of this book culminate in a project that help improve the quality of people’s lives.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

Getting Started with Python and the Raspberry Pi Zero

Getting Started with Python and the Raspberry Pi Zero

Let's get started!

Introduction to the Raspberry Pi Zero

The setup of the Raspberry Pi Zero

Let's learn Python!

The Hello World example

Summary

Arithmetic Operations, Loops, and Blinky Lights

Arithmetic Operations, Loops, and Blinky Lights

Hardware required for this chapter

Arithmetic operations

Bitwise operators in Python

Logical operators

Data types and variables in Python

Reading inputs from the user

Loops in Python

Raspberry Pi's GPIO

Summary

Conditional Statements, Functions, and Lists

Conditional Statements, Functions, and Lists

Conditional statements

Functions in Python

Some mini-project challenges for the reader

Summary

Communication Interfaces

Communication Interfaces

UART - serial port

The SPI interface

Summary

Data Types and Object-Oriented Programming in Python

Data Types and Object-Oriented Programming in Python

Lists

Dictionaries

Tuples

Sets

OOP in Python

Speaker controller

Summary

File I/O and Python Utilities

File I/O and Python Utilities

File I/O

Python utilities

Summary

Requests and Web Frameworks

Requests and Web Frameworks

The try/except keywords

Connecting to the Internet - web requests

Flask web framework

Summary

Awesome Things You Could Develop Using Python

Awesome Things You Could Develop Using Python

Image processing using a Raspberry Pi Zero

Speech recognition

Automating routing tasks

Improving daily commute

Improving your vocabulary

Logging

Threading in Python

PEP8 style guide for Python

Summary

Lets Build a Robot!

Lets Build a Robot!

Components of the robot

Setting up remote login

Chassis setup

Preparing the motor driver circuit

Raspberry Pi Zero and motor driver assembly

Camera setup

The web interface

Camera setup for the web interface

Buttons for robot control

Troubleshooting tips

Project enhancements

Summary

Home Automation Using the Raspberry Pi Zero

Home Automation Using the Raspberry Pi Zero

Voice activated personal assistant

Web framework based appliance control/dashboard

Personal Health Improvement—Sitting is the new smoking

Smart lawn sprinkler

Summary

Tips and Tricks

Tips and Tricks

Change your Raspberry Pi's password

Setting up your development environment

VNC access to Raspberry Pi

Summary

Python utilities

Python comes with several utilities that enables interacting with other files and the operating system itself. We have identified all those Python utilities that we have used in our past projects. Let's discuss the different modules and their uses as we might use them in the final project of this book.

The os module

As the name suggests, this module (https://docs.python.org/3.1/library/os.html) enables interacting with the operating system. Let's discuss some of its applications with examples.

Checking a file's existence

The os module could be used to check if a file exists in a specific directory. For example: We extensively made use of the write_file.txt file. Before opening this file to read or write, we could check the file's existence:

import os
if __name__ == "__main__":
    # Check if file exists
    if os.path.isfile('/home/pi/Desktop/code_samples/write_file.txt'):
        print('The file exists!')
    else:
        print('The file does not exist!')

In the preceding code...

CONTINUE READING

83

Tech Concepts

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Programming languages

73

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