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Python Programming with Raspberry Pi

Python Programming with Raspberry Pi

By : Sai Yamanoor, Srihari Yamanoor
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Python Programming with Raspberry Pi

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.
Table of Contents (12 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
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
2
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
3
Conditional Statements, Functions, and Lists
Conditional Statements, Functions, and Lists
Conditional statements
Functions in Python
Some mini-project challenges for the reader
Summary
4
Communication Interfaces
Communication Interfaces
UART - serial port
The SPI interface
Summary
5
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
6
File I/O and Python Utilities
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File I/O and Python Utilities
File I/O
Python utilities
Summary
7
Requests and Web Frameworks
Requests and Web Frameworks
The try/except keywords
Connecting to the Internet - web requests
Flask web framework
Summary
8
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
9
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
10
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
11
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...

End of Section 3
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