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Scan QR Codes with Raspberry Pi Pico

 To extract information from QR codes and (even create your own barcode & QR Code using Python), use a Barcode & QR Code HAT and a Raspberry Pi Pico

Scan QR Codes with Raspberry Pi Pico

What Are QR Codes and How Do They Work?

QR codes, which are similar to barcodes in that they can encode data represented by black and white squares, are similar to QR codes. Instead of employing a laser, a camera detects the difference between the spaces and delivers the data to be processed. They're made up of multiple huge squares that help align and place the QR code's boundaries, as well as formatting columns, a version number, and the data itself.

How QR Codes Work
Credit: Arduino “having11” Guy

Hardware Used

They can encode a wide range of data types, including integers, characters, and binary, allowing for a wide range of creative applications. Advertisers frequently include URLs that drive users to their websites. Other businesses may use a QR code to encode critical product data, such as a serial number, and attach it to a component.

Barcode HAT for Raspberry Pi Pico

Create Barcodes & QR Codes with Python

Creating Barcode In Python

I’ve already created a blog on “Create Barcodes with Pure Python

Creating QR Code in Python

Users can easily encode data within a QR code and then export it as a picture using the Python tool "qrcode." Run the following command to install it:

pip3 install qrcode[pil]

Then you can use it in a script to create a PIL picture using:

import qrcode
code = qrcode.make('
Hello world!')

The image may then be saved as a file by using

code.save(<filename>.png)

The QRCode class allows you to further personalise your codes with settings like size, error correction amount, version, and border width.

>>> import qrcode

>>> code = qrcode.make('Hello world')

>>> code.save('hellocode.png')

The QRCode class allows you to further personalise your codes with settings like size, error correction amount, version, and border width.

>>> qr = qrcode.QRCode(version=20, error_correction=qrcode.constants.ERROR_CORRECT_M, box_size=10, border=4)

>>> qr.add_data('https://shopmakergenix.blogspot.com')

>>> qr.make(fit=True)

>>> img = qr.make_image(fill_color="black", black_color="white")

>>> img.save('url_example.png')

After you've made all of your personalised QR codes, combine them into a single sheet and print it. 

Setting Up the Raspberry Pi Pico

Pico barcode HAT Assembly

The default mode is USB-KBW, or USB keyboard mode, which sends data to the host by simulating a USB keyboard.
Barcode HAT

Scan the barcode above and you’re ready to scan 20 Different Barcode Symbiology

Pico barcode HAT

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