Scan QR Codes at a Lower Cost
Reading QR Codes with a $7 QR Code Reading Module
A new, low-cost QR code reading device is making waves in the tech world. This device, priced at just $7, offers an easy-to-use solution for QR code reading using Python and I2C communication.
The device comes equipped with a camera, an RP2040 microcontroller, and a Qwiic connector for easy hookup. It communicates over I2C, making it simple to connect it to a variety of host devices, such as Raspberry Pi or a PC with I2C support.
To get started, connect the QR code reading module to your host device via I2C, and power it (usually 3.3V or 5V depending on your board). Once connected, install the Python library, which provides an easy interface for I2C communication with the module.
With the library set up, initiate communication with the device using its I2C address. The module's firmware processes the image internally and sends the decoded QR string data via I2C. In Python, continuously poll or listen to the device using the I2CDriver methods to read the data buffer containing the decoded QR code string.
However, there are a few things to keep in mind. The QR code must be well centered in the camera's view, as the field of view is narrower than advertised. Additionally, watch out for I2C data packet size limits; chunk reading might be needed for longer QR code contents.
Here's a simple example of Python logic to read QR codes:
```python from I2CDriver import I2CDriver
i2c = I2CDriver(address=0xXX) # Replace 0xXX with actual device I2C address
def read_qr_code(): data = i2c.read() # method depends on I2CDriver API specifics if data: qr_string = data.decode('utf-8').strip() if qr_string: print("QR Code detected:", qr_string)
while True: read_qr_code() ```
This low-cost QR code reading module offers a versatile platform for various imaging projects. Whether you're looking to develop a custom QR code reader or leverage the device for other purposes, this $7 QR code reading module is an affordable and efficient solution.
[1] Note: This article is based on the given bullet points and provides a general overview of the QR code reading module. For specific details regarding the module's usage, consult the official documentation.
This low-cost QR code reading module can be integrated with smart-home-devices to automate various functions. For instance, you can use the device to read QR codes on gadgets like your smartphone and trigger specific actions in your home.
Moreover, this innovative technology can be utilized beyond QR code reading in a variety of projects, such as building custom computer vision systems or even developing new gadgets that interact with QR codes.
