Book Image

Python Programming with Raspberry Pi

By : Sai Yamanoor, Srihari Yamanoor
Book Image

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 (17 chapters)
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Flask web framework


In our final section, we will discuss web frameworks in Python. We will discuss the Flask framework (http://flask.pocoo.org/). Python-based frameworks enable interfacing sensors to a network using the Raspberry Pi Zero. This enables controlling appliances and reading data from sensors from anywhere within a network. Let's get started!

Installing Flask

The first step is installing the Flask framework. It can be done as follows:

sudo pip3 install flask

Building our first example

The Flask framework documentation explains building the first example. Modify the example from the documentation as follows:

#!/usr/bin/python3

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run('0.0.0.0')

Launch this example (available for download along with this chapter as flask_example.py) and it should launch a server on the Raspberry Pi Zero visible to the network. On another computer, launch a browser and...