BBC micro:bit Expansion Board V3.0

SKU: FA1077-2
Input Voltage

6V – 12V DC (5.5mm Jack) or 5V (USB-C)
Output Voltage

3.3V and 5V (Jumper Selectable)
Max Output Current

2.0A
I/O Interface

All 20 Pins broken out to G-V-S headers
Communication

2x I2C Ports, 1x Serial/UART Port
Compatibility

Micro:bit V1.5, V2.0, and V2.2
Dimensions

80mm x 58mm
The BBC micro:bit Expansion Board V3.0 is the latest 2026-standard I/O breakout solution, specifically engineered to support the advanced features of the micro:bit V2.2 while maintaining backward compatibility. It is the most robust and feature-rich expansion platform for high-level robotics and IoT prototyping. 
Long Product Description
The BBC micro:bit Expansion Board V3.0 is a professional-grade interface designed to transform the micro:bit into a powerful industrial or educational controller. As coding curriculums move toward AI and complex automation, the V3.0 board meets these demands with a high-current power architecture and an expanded array of connectivity options. 
This version introduces a high-efficiency DC-DC buck converter, allowing the board to handle input voltages up to 12V while providing a rock-solid 2A output—enough to power multiple high-torque servos, sensors, and even small displays simultaneously. The board utilizes the “G-V-S” (Ground-Voltage-Signal) color-coded pin system, which significantly reduces wiring errors for students and engineers alike. Additionally, the V3.0 features dedicated I2C and UART ports, making it easier than ever to integrate OLED screens, GPS modules, and advanced sensors into your micro:bit ecosystem. 
Key Features
  • High-Current DC-DC Power: Onboard buck converter supports 6V–12V input and delivers up to 2A at 3.3V/5V, ideal for robotics.
  • Color-Coded G-V-S Headers: Standardized 3-pin headers (Signal-Yellow, Voltage-Red, Ground-Black) for instant, error-free peripheral connection.
  • Integrated Power Controls: Includes a physical power toggle switch and a self-resetting fuse to protect the micro:bit from overcurrent.
  • Dual I2C & UART Ports: Dedicated 4-pin headers for rapid connection of I2C devices (like OLEDs) and serial communication modules.
  • Onboard Audio & Feedback: Includes an integrated passive buzzer (with mute jumper) and status LEDs for power and logic activity.
  • Lego & M3 Mounting Compatibility: Cross-hole design allows for seamless integration into Lego Technic builds or permanent M3 screw mount enclosures.
Usage Instructions
  1. Insertion: Slide the micro:bit into the horizontal slot. Ensure the board is fully seated.
  2. Voltage Selection: Use the onboard jumper to select 5V or 3.3V for the “V” pins, depending on whether you are using servos (5V) or standard sensors (3.3V).
  3. Connection: Connect your peripherals using the G-V-S format. Note: The Signal (S) pins are 3.3V logic level.
  4. Powering: Connect a power adapter to the DC jack. Switch the board to “ON.”
  5. Programming: Use the micro:bit MakeCode Editor. All pin numbers on the expansion board correspond exactly to the digital/analog pins in the software.
Q: Can this board power a robotic arm with 6 servos?

Yes. Unlike V1.0 or V2.0 boards, the V3.0 features a 2A high-current regulator specifically designed to handle the “stall current” of multiple servos simultaneously.

Q: Does it have a speaker?

It includes an onboard buzzer for simple tones. If you are using a micro:bit V2, you can use either the onboard V2 speaker or the expansion board’s buzzer

Q: Is it safe for 2026 classroom standards?

Absolutely. It includes reverse polarity protection, over-voltage protection, and a physical power switch, making it the safest choice for educational and business purchasing.

Q: Can I use this for IoT data logging?

Yes. The dedicated I2C ports are perfect for connecting environmental sensors, and the stable power supply ensures the micro:bit can run 24/7 without resets

Q: Is there bulk pricing for STEM distributors or corporate training?

Yes. We offer tiered pricing for schools and businesses. The V3.0 is available in “Neutral Industrial Packing” to reduce costs for large-scale deployments. Please contact our authorized wholesale channel for a quote.

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