Compact, lowpower 3axis acceleration sensor module based on the BMA400. Designed for batterypowered and spaceconstrained projects, this module provides reliable motion sensing with a standard SPI interface for easy integration with microcontrollers and singleboard computers. Why choose this module Low power consumption and builtin motion features reduce system energy use and processing overhead, extending battery life in wearables, asset trackers, and IoT devices. Industrystandard SPI interface simplifies wired communication and makes the module compatible with common development platforms. Small form factor and a readytouse breakout layout speed up prototyping and shorten development time. Key benefits Energy efficient: Built for applications where long battery life matters, allowing continuous or eventdriven motion detection without large power penalties. Readytointegrate: The SPI interface and standard breakout pins let you connect quickly to Arduino, ESP32, STM32, Raspberry Pi (with appropriate level shifting), and other controllers. Smart motion handling: Onchip features (common to the BMA400 family) reduce the need for continuous host processing by providing event interrupts for activity, orientation, and other motion events. Core attributes Sensor type: BMA400 3axis digital accelerometer. Interface: SPI (module wired for SPI communication). Compatible with typical SPI master controllers; check wiring and voltage levels before connection. Functionality: 3axis acceleration measurement, motion detection and event interrupt capability when used as implemented on the BMA400 platform. Size and format: Small sensor module / breakout suitable for PCB mounting or breadboard prototyping. Compact form factor conserves space in embedded designs. Material and construction: Surfacemounted MEMS accelerometer packaged on a breakout board with header pads or presoldered pins (module configuration may vary by seller). Performance characteristics: Provides reliable acceleration sensing across three axes with the functionality expected from the BMA400 sensor family; intended for lowpower, reliability applications. Compatibility and integration notes Works with microcontrollers and development boards that support SPI master mode. For controllers that use different voltage domains, use level shifting as needed. Typical software integration uses SPI drivers and registerlevel configuration consistent with BMA400 documentation and driver examples (vendors commonly provide libraries or community code). Ensure correct power supply voltage as specified for the BMA400 family and follow recommended PCB layout and grounding practices for performance. Common applications and use cases Wearable activity tracking: Use the module to detect steps, activity vs. inactivity, and orientation changes while keeping power draw low for multiday battery life. Portable IoT sensors and asset trackers: Add motionbased wakeup or tamper detection to remote nodes; eventdriven interrupts reduce data transmission and extend battery life. Vibration and basic impact monitoring: Integrate into industrial or consumer devices to monitor motion events, impacts, or orientation changes for safety and diagnostics. What you get A compact BMA400based 3axis accelerometer module with SPI interface, ready to integrate into prototypes and final designs. Straightforward wiring to microcontroller SPI ports and interrupt lines for eventdriven operation. Practical tips Reference the BMA400 datasheet and available driver code when configuring sampling rates, filters, and interrupt mapping. This ensures correct behavior for your specific application. Validate voltage compatibility between the module and your controller; use level shifting where required. Use the module's interrupt pins to minimize host wakeups and maximize power savings. This module brings the proven BMA400 acceleration sensing capability into a compact, lowpower SPIready format for fast prototyping and efficient deployment in batterypowered and embedded motionsensing projects.