Flask web server on Raspberry Pi - Mini Project: Build & Apply

Flask web server on Raspberry Pi

📖 Scenario: You have a Raspberry Pi and want to create a simple web server to show a welcome message in your browser. Flask is a small tool that helps you make web servers easily.

🎯 Goal: Build a basic Flask web server on your Raspberry Pi that shows a welcome message when you open it in a web browser.

📋 What You'll Learn

Create a Flask app instance

Set up a route for the home page

Return a welcome message from the route

Run the Flask app on the Raspberry Pi

💡 Why This Matters

🌍 Real World

Many Raspberry Pi projects use Flask to create simple web interfaces for controlling devices or showing sensor data.

💼 Career

Knowing how to build and run Flask web servers is useful for IoT developers, embedded systems engineers, and web developers working with small devices.

1

Set up the Flask app

Import Flask from the flask module and create a Flask app instance called app.

Raspberry Pi

# Import Flask and create app instance
# Your code here

Need a hint?

Use from flask import Flask and then app = Flask(__name__).

2

Create a route for the home page

Use the @app.route('/') decorator to create a function called home that returns the string 'Welcome to my Raspberry Pi web server!'.

Raspberry Pi

from flask import Flask
app = Flask(__name__)

# Create home route
# Your code here

Need a hint?

Use @app.route('/') above a function named home that returns the welcome message.

3

Configure the app to run on all IP addresses

Add an if __name__ == '__main__': block and run app.run(host='0.0.0.0') to make the server accessible on your local network.

Raspberry Pi

from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return 'Welcome to my Raspberry Pi web server!'

# Run the app on all IP addresses
# Your code here

Need a hint?

Use if __name__ == '__main__': and inside it call app.run(host='0.0.0.0').

4

Start the server and see the output

Run the program and print 'Server is running on http://0.0.0.0:5000' to confirm the server started.

Raspberry Pi

from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return 'Welcome to my Raspberry Pi web server!'

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

# Print confirmation message
# Your code here

Need a hint?

Print the message before calling app.run().