How to Enable Parallel Execution of Serial Read and Flask Threads in Python

Discover how to effectively run a Flask server and a serial read thread in parallel on a Raspberry Pi, ensuring seamless data display on your web application.
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How to Enable Parallel Execution of Serial Read and Flask Threads in Python

If you’re trying to read serial data from a device and display it on a webpage using Flask on a Raspberry Pi, you might encounter a common problem: the serial read thread doesn’t seem to run simultaneously with the Flask server. This can be frustrating, especially when you know both functionalities are essential for your application.

In this guide, we'll explore the problem and provide a clear and effective solution to ensure your Flask server and serial read thread operate in tandem. By the end of this guide, you'll have a better understanding of how to manage multiple threads in Python effectively.

Understanding the Problem

Why This Happens

Thread Blocking: If one thread monopolizes the CPU (like the Flask thread waiting for requests), the other thread (serial reading) has no chance to execute.

The Solution

To enable both threads to run in parallel efficiently, we need to simplify the structure of your code. Here are the essential adjustments:

1. Separate Execution Context

Instead of running the Flask server in a thread, allow it to operate in its main thread while the serial read operates in a separate thread. Here’s how the adjusted code looks:

[[See Video to Reveal this Text or Code Snippet]]

Key Changes Explained

2. Running the Code

Simply execute the modified Python script, and both the Flask server and serial read functions will operate concurrently, meaning data can be read from your serial device and displayed on your webpage without interruptions.

Conclusion

By structuring your Flask application and serial communication correctly, you can easily enable both to run in parallel without conflicts. This setup not only enhances functionality but also improves the responsiveness of your application, allowing for real-time data communication from your Raspberry Pi.

Ready to take your Flask and serial communication skills to the next level? With these tips and adjustments, you’ll be well on your way to building seamless, interactive web applications.