Megahub is an ESP32-based experimentation platform designed for robotics enthusiasts and tinkerers. It brings together the versatility of the entire ESP32 ecosystem with convenient support for LEGO© WeDo/Powered Up! devices, offering both Lua scripting and Blockly visual programming for easy control and automation.
This open-source project empowers makers to explore and build robotic creations using the full capabilities of the ESP32 platform – from WiFi and Bluetooth connectivity to a vast array of sensors and actuators – while seamlessly integrating popular LEGO© components alongside standard electronics. It comes with the hardware schematics, production files and the Megahub firmware as a PlatformIO project as well.
Build and use it at your own Risk!!
- KiCad: All schematics and PCB production files are available in KiCad and Gerber format
- WiFi Enabled: Built-in wireless connectivity for remote control and programming
- Bluetooth Enabled: Acts as a Bluetooth BLE Server and Client
- IDE: Configure and program Megahub through the intuitive Megahub IDE
- Visual Programming Interface: Blockly visual programming for beginners
- SD-Card: Built-in SD-card reader to store multiple projects (autostart possible)
- 4 Motors / Devices: Connect up to 4 generic or LEGO© WeDo 2.0/Powered Up! devices simultaneously (motors, sensors, etc.)
- Built-in IMU: Integrated MPU6050 6-axis accelerometer and gyroscope for motion sensing
- FastLED/NeoPixel Support: Built-in support for addressable RGB LED strips
- Flexible GPIO: Additional GPIO pins available for custom sensors, buttons, and peripherals
- Gamepad: Can be paired with Bluetooth Classic HID compatible Gamepads (8BitDo M30, ...)
- BT/WiFi switch: Allow configuration over Bluetooth API instead of Restful HTTP API is comming soon...
- ROS(Robot Operating System): Micro ROS support is comming soon...
- MQTT: MQTT support is comming soon...
- I wanted to learn something new
- Designing Hard- and Software work together is fun
- There is no truly open system with the same capabilities available
- Open Source: Complete control over firmware and functionality
- Expandable: Access to additional GPIO pins for custom hardware
- Programming Flexibility: Choose between Lua scripting or visual programming
- Built-in Features: Integrated IMU and LED controller without additional hubs
- Cost-effective: Based on affordable ESP32 hardware
- LEGO Compatibility: Native support for LEGO© WeDo 2.0 protocol
- Web-based Programming: No proprietary software required
- Cost-effective: Based on affordable ESP32 hardware
- Visual Programming: Blockly support makes it accessible for all skill levels
Project management
IMU interaction
LEGO / Gamepad interaction
- PlatformIO installed (either as a CLI tool or as a VSCode extension)
- An ESP32 development board
- USB cable for flashing
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Clone the repository:
git clone https://github.com/mirkosertic/Megahub.git cd Megahub -
Build the project using PlatformIO:
pio run
Or if using VSCode with the PlatformIO extension, click the Build button in the bottom toolbar.
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Connect your ESP32 board via USB.
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Flash the firmware:
pio run --target upload
Or use the Upload button in the PlatformIO toolbar in VSCode.
By default, the Megahub firmware runs in Bluetooth mode. To configure your board and start programming:
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Open the Megahub IDE in your web browser.
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The web-based IDE uses the Web Bluetooth API to connect to your Megahub device. Make sure you are using a compatible browser (Chrome, Edge, or Opera on desktop).
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Click Connect in the IDE and select your Megahub device from the Bluetooth pairing dialog.
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Once connected, you can configure WiFi settings, upload projects, and program your device using either Lua scripting or Blockly visual programming.
To view debug output from the board:
pio device monitorThe default baud rate is 115200.
For a complete reference of all available Blockly blocks including visual examples, see the Blockly Blocks Documentation.