DFRobot Gravity BMI323 6DOF IMU Sensor Module - I2C/UART, Plug & Play

The default I2C address is 0x4A. The module supports three additional configurable addresses (0x4B, 0x4C, 0x4D), allowing up to four identical sensors on the same I2C bus. Address selection is typically configured via solder jumpers or software commands as per the DFRobot documentation.

The module is designed for a wide operating voltage range of 3.3V to 5V DC. The onboard level shifting circuitry ensures safe communication with both 3.3V and 5V host microcontrollers (e.g., Arduino Uno at 5V, ESP32 at 3.3V) via its I2C and UART interfaces without requiring external logic level converters.

The Bosch BMI323 chip includes dedicated hardware processing engines for motion detection. Algorithms for step counting, single/double tap, orientation tilt, free-fall, and activity recognition (stationary/walking/running) run internally on the IMU. These features generate configurable interrupts, significantly reducing host MCU computational load and power consumption for always-on sensing applications.

The integrated 2048-byte FIFO (First-In, First-Out) buffer stores accelerometer and gyroscope data samples. This allows the sensor to collect data at high rates (up to 6400 Hz) and hold it temporarily, enabling the host processor to read large batches less frequently. This minimizes bus traffic, prevents data loss during host processing delays, and is essential for efficient power management in low-power modes.