# micro:bit Smart Hub Overview
## Introduction
The **micro: bit Smart Hub** is a versatile expansion device designed for the micro: bit development board, offering a wide range of interfaces and high compatibility. It features 6 standard I/O sensor ports, 4 I²C ports, 4 DC motor ports, and 4 servo ports, all using the Grove open-source standard. The hub connects directly to the micro: bit board and is compatible with most Grove hardware. It seamlessly integrates with LEGO bricks, enabling students to create innovative STEM projects with micro: bit technology.
## Structure
Schematic Drawing
| No. | Item | **Description** |
| :---: | :---: | --- |
| ① | Power Button | Press and hold for 1.5 seconds to turn on/off. |
| ② | Battery Indicator | Four red LEDs indicate battery status. All LEDs light up when fully charged, and LEDs blink or turn off at 75%, 50%, 25%, and 0%. Red LEDs blink while charging to show the current battery level. |
| ③ | Program Download Port | Use a micro USB cable to download the program. |
| ④ | Motor Ports | DC motor driver ports. |
| ⑤ | Servo Ports | Servo motor driver ports. |
| ⑥ | I²C Ports | Use Grove ports for I²C communication. |
| ⑦ | I/O Ports | Use HY2.0-4P ports to send/receive digital and analog signals. |
| ⑧ | micro: bit Board | Gold finger interface to connect the micro: bit board. |
| ⑨ | Battery Compartment | Built-in removable 7.4V 1000mAh Li-Po. |
| ⑩ | Power Charging Port | Use a microUSB cable to charge with 5V=1A. |
> Hub adapted for V1.5 and above micro: bit motherboard. Using V2.0 and above micro: bit motherboard is recommended.
>
## Specifications
| Item | **Description** |
| :---: | :---: |
| Name | micro: bit Smart Hub |
| Code | B0020001 |
| Dimension | 88mm x 56mm x 32mm (L x W x H) |
| Weight | 126g |
| Material | ABS |
| Battery Voltage | 7.4V-DC( Li-Po ) |
| Battery Capacity | 1000mAh |
| Charging Limit | 5V=1A |
| Usage Time | Approx. 4H |
| Main Control Board | micro: bit V2 |
| Ports | 6 I/O Ports, 4 I²C Ports, 4 Motor Ports, 4 Servo Ports |
| Port Voltage | 5V |
| Compatible Software | MakeCode，Micropython，Scratch, etc. |
| Suitable Age | 6+ |
| Compatibility | LEGO |
> **Note:** Data in this report is based on laboratory tests and simulated usage scenarios. Actual battery usage time may vary.
>
## Usage
### Interface connection
Standard I/O interface connection diagram
I²C interface connection diagra
Motor connection diagram
Geek Servo connection diagram
Note: When the Geek servo is connected, note that the joint metal sheet is on the same side as the micro: bit master control panel. Do not reverse it to avoid damage to the module.
### Hub charge
Micro: bit hub to power the micro: bit mainboard and related equipment, Note that the hub has an independent charging port for charging, and the mainboard interface can not charge and power the hub.
## Replacing the micro: bit
To replace the micro: bit mainboard, detach it with the protective case, remove the old board, and install the new one. Then, turn the hub upside down and reinsert the protective case.
### micro: bit Introduction
|  |  |
| :---: | :---: |
| micro: bit V2.0 | |
The micro: bit (BBC micro: bit) is a development board by the BBC for youth programming education. About the size of a credit card (4cm x 5cm), it features 25 red LEDs, two programmable buttons (A and B), and built-in sensors like an accelerometer and magnetometer. With Bluetooth, radio communication, and battery interfaces, it supports external devices. The micro: bit allows interactive projects by flashing LEDs to display letters, numbers, and patterns based on pre-programmed designs.