Boardoza I²C Hub Module

The Boardoza I²C Hub is a compact passive distribution module designed to simplify the connection of multiple I²C devices to a single microcontroller or development board. It distributes the four essential I²C signals—VCC, GND, SDA, and SCL—across multiple connectors, making it easy to build multi-device I²C systems without complex wiring or large breadboard setups.

Compatible with Arduino, Raspberry Pi, ESP32, STM32, and other I²C-capable platforms, the Boardoza I²C Hub is ideal for projects involving multiple sensors, OLED displays, real-time clocks, EEPROMs, environmental monitoring modules, and other I²C peripherals. Since all connectors share the same I²C bus, the board provides a simple and reliable way to expand I²C connectivity while keeping wiring clean and organized.

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Front Side	Back Side

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Key Features

• Simple I²C Expansion: Connect up to four I²C modules using dedicated connectors.
• Parallel Bus Distribution: Shares VCC, GND, SDA, and SCL across every connector.
• Breadboard Alternative: Keeps wiring clean and organized in multi-sensor projects.
• Plug-and-Play Design: No drivers, firmware, or software configuration required.
• Power Indicator LED: Easily confirms that supply voltage is present.
• Wide Platform Compatibility: Works with Arduino, Raspberry Pi, ESP32, STM32, and other I²C-enabled controllers.

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Technical Specifications

Model: I²C Hub
Manufacturer: Boardoza
Board Type: Passive I²C Distribution Module
Input Voltage: Determined by the connected controller and I²C peripherals
Connection Types: 4-pin I²C connectors and 2.54mm header pins
Functions: I²C Power and Signal Distribution
Communication Protocol: I²C (Pass-through)
Distributed Signals: VCC, GND, SDA, SCL
Dedicated I²C Connectors: 4
Header Connections: 4 (Parallel)
Bus Architecture: Passive Parallel Distribution
Operating Temperature: -55°C to +85°C
Board Dimensions: 40mm × 20mm

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Board Pinout

( J1 ) I²C Connector

Pin Number	Pin Name	Description
1	VCC	Supply voltage for connected I²C devices
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J2 ) I²C Connector

Pin Number	Pin Name	Description
1	VCC	Supply voltage for connected I²C devices
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J3 ) I²C Connector

Pin Number	Pin Name	Description
1	VCC	Supply voltage for connected I²C devices
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J4 ) I²C Connector

Pin Number	Pin Name	Description
1	VCC	Supply voltage for connected I²C devices
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J5 ) Header Connection

Pin Number	Pin Name	Description
1	VCC	Supply voltage
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J6 ) Header Connection

Pin Number	Pin Name	Description
1	VCC	Supply voltage
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J7 ) Header Connection

Pin Number	Pin Name	Description
1	VCC	Supply voltage
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

( J8 ) Header Connection

Pin Number	Pin Name	Description
1	VCC	Supply voltage
2	SCL	I²C Serial Clock
3	SDA	I²C Serial Data
4	GND	Ground

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Important Usage Notes

• All SDA pins are electrically connected.
• All SCL pins are electrically connected.
• All VCC pins are electrically connected.
• All GND pins are electrically connected.
• Every connected I²C device must have a unique I²C address.
• Devices with identical fixed addresses cannot communicate simultaneously on the same bus.
• The board does not provide address translation, bus multiplexing, buffering, or voltage level shifting.
• When connecting multiple modules with onboard pull-up resistors, verify the total pull-up resistance of the bus.
• Excessive cable length or bus capacitance may reduce communication reliability, especially at higher I²C clock frequencies.

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Board Dimensions

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Step Files

Boardoza I²C Hub.step

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Datasheet

This product is a passive PCB distribution board and does not contain an active integrated circuit. Therefore, no dedicated device datasheet is required.

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Version History

• V1.0.0 - Initial Release

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Support

• If you have any questions or need support, please contact [email protected]

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License

Hardware Design

All hardware design files are licensed under Creative Commons Attribution-ShareAlike 4.0 International License.