DFRobot
Gravity: Digital 1-to-8 I2C Multiplexer
The Gravity I2C Multiplexer solves address conflicts when you need to connect multiple I²C devices that share the same fixed address. It provides eight indep...
The Gravity I2C Multiplexer solves address conflicts when you need to connect multiple I²C devices that share the same fixed address. It provides eight independent I²C ports on a single bus, allowing up to eight identical-address sensors or modules to communicate without conflict.
The default I²C address is 0x70, adjustable via onboard DIP switches from 0x70 to 0x77. By chaining up to eight multiplexers with different addresses, you can theoretically control up to 64 same-address devices on one I²C bus.
Key Features
- 8× Independent I²C Ports – Connect up to 8 same-address devices on one bus
- Configurable Address – 0x70 to 0x77 via onboard DIP switches
- 3.3 V and 5 V Compatible – Works with Arduino, Raspberry Pi, and other boards
- I²C Clock Rates – 100 kHz and 400 kHz
- Gravity Connector – PH2.0-4P plug-and-play interface (no soldering required)
- Reset Pin – Active-low reset
- Dimensions – 32 × 32 mm (1.26 × 1.26 in)
Ideal For
- Multi-sensor arrays with fixed I²C addresses
- Environmental monitoring with multiple identical sensors
- Expanding I²C bus capacity in complex projects
Resources
- Product Wiki – Pinout, wiring diagram, and Arduino/Raspberry Pi examples
- Arduino Library (GitHub)
Jargon buster
Plain-language definitions for the technical terms used above.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
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