Flash Multiple ESP32 Boards Simultaneously

The ESP32 is a versatile microcontroller used in countless IoT applications. However, in mass production, the repetitive task of flashing firmware onto each device can become a major bottleneck. But what if you could flash multiple ESP32 boards at once? In this guide, we'll show you how to set up parallel flashing for ESP32 boards, drastically reducing the time needed to prepare your devices for deployment.

Why Parallel Flashing?

• • Efficiency: Flash 10, 20, or even more devices simultaneously.
  • Cost-Effective: Reduce labor costs by cutting down on production time.
  • Scalability: Ideal for companies scaling up their ESP32-based product lines.

Setting Up Parallel Flashing

Here’s a step-by-step guide to flashing multiple ESP32 boards in parallel using esptool.py.

Step 1: Gather Your Hardware

You'll need a USB hub and multiple USB cables to connect all your ESP32 boards to your computer.

Step 2: Identify Your Serial Ports

Connect your ESP32 boards and identify their corresponding serial ports (e.g., /dev/ttyUSB0, /dev/ttyUSB1 on Linux/macOS, or COM3, COM4 on Windows).

Step 3: Create a Flashing Script

You can write a simple shell or batch script to run esptool.py commands in parallel for each connected device.

• • Linux/macOS: Script Example
  • Windows: Script Example

Step 4: Execute the Script

Run the script on your computer to flash all connected ESP32 boards at once.

Advanced Tips

• • Power Management: Ensure your USB hub provides sufficient power to all connected devices.
  • Error Handling: Consider adding checks to ensure each board is flashed successfully.

Troubleshooting Tips

• • Serial Port Conflicts: Ensure each ESP32 is on a unique port.
  • Firmware Size: Double-check that your firmware fits within the ESP32's available memory.

Conclusion

Parallel flashing with esptool.py can significantly streamline your production process, especially when dealing with large batches of ESP32 devices. By adopting this method, companies can reduce production time, lower costs, and scale up more effectively.

Join the Conversation Have you tried parallel flashing in your production workflow? Share your experiences, tips, or any challenges in the comments here. Let’s keep pushing the boundaries of what’s possible!

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