I2C Splitter Expand Module for Pixhawk and APM Flight Controllers Overview This I2C splitter expand module adds extra I2C connections to Pixhawk and APM flight controllers, making it easier to connect multiple sensors and peripherals without rewiring the main bus. It is compact and lightweight for clean installation in drones and other RC projects. Key benefits Expandability: Add multiple I2C devices to a single flight controller I2C port to support additional compasses, rangefinders, environmental sensors, or other I2C peripherals. Simpler wiring: Reduce the need to stack or rewire sensors on the main bus, improving cable management and reducing installation time. Compatibility: Works with Pixhawk and APM style flight controllers and follows standard I2C connector layouts for straightforward connection. Reliable signal routing: Designed to maintain stable I2C communication when several devices are attached, helping avoid noisy or unreliable connections. Compact and lightweight: Small footprint that fits easily into most airframes without adding significant weight or bulk. Function and performance Purpose: Splits a single I2C port into multiple I2C outputs so several I2C slave devices can be connected simultaneously. Performance focus: Keeps I2C wiring organized while preserving bus communication for sensors that rely on the flight controller I2C interface. Construction: Compact PCB module with standard headers for direct connection to flight controller I2C ports and peripheral sensor cables. Compatibility Designed for use with Pixhawk and APM family flight controllers and other controllers that use standard I2C connector layouts. Supports a wide range of I2C sensors and modules commonly used in RC drones and autopilot projects. Practical applications Dual compass setup: Connect an external compass while retaining other I2C sensors on the same bus to improve heading accuracy and redundancy. Sensor expansion for mapping or inspection drones: Add rangefinders, airspeed sensors, magnetometers, and environmental sensors without modifying the main controller wiring. Development and testing: Use the splitter on a bench or in a test rig to evaluate multiple I2C modules concurrently or swap sensors quickly during tuning and diagnostics. What to expect A simple, plug and play solution to expand I2C connectivity on Pixhawk and APM flight controllers. The module helps tidy wiring, reduce installation complexity, and enable multiple I2C devices to operate from a single controller port. Note Check sensor addresses and bus requirements when connecting multiple I2C devices to avoid address conflicts and ensure proper operation.