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7Semi BMA400 3-Axis Digital Accelerometer Breakout Board STEMMA QT / Qwiic

7Semi BMA400 3-Axis Digital Accelerometer Breakout Board STEMMA QT / Qwiic

₹289.00Price
🔹 7Semi BMA400 3-Axis Digital Accelerometer Breakout (STEMMA QT / Qwiic) – Technical Information
🔹 Overview
The 7Semi BMA400 Breakout is a 3-axis ultra-low power digital accelerometer module based on the Bosch BMA400 MEMS sensor.
  • Measures acceleration in X, Y, Z axes
  • Provides digital output (I2C/SPI)
  • Designed for low-power motion sensing applications
👉 Optimized for wearables, IoT, and battery-powered systems
🔹 Working Principle
  • Uses MEMS capacitive sensing:
    • Acceleration → displacement of microstructure
    • Change in capacitance → electrical signal
  • Internal system:
    • Signal conditioning
    • ADC conversion
    • Digital processing
👉 Outputs calibrated digital acceleration data
🔹 Measurement Characteristics
  • Axes: 3-axis (X, Y, Z)
  • Measurement Range:
    • ±2g / ±4g / ±8g / ±16g
  • Resolution:
    • 12-bit digital output
  • Sensitivity:
    • Up to ~0.001g resolution
  • Output Data Rate:
    • 12.5 Hz to 800 Hz
🔹 Electrical Characteristics
  • Operating Voltage (sensor): 1.72V – 3.6V
  • Breakout Support: 3.3V / 5V compatible
🔋 Power Consumption
  • Active mode: < 14.5 µA
  • Sleep mode: ~0.8 µA
👉 Extremely low power → ideal for long battery life devices
🔹 Communication Interface
  • I2C (default)
  • SPI (optional)
I2C Address
  • Default: 0x14
  • Alternate: 0x15
🔹 Breakout Board Features
  • STEMMA QT / Qwiic connector (JST-SH 4-pin)
  • 2.54mm header pins (breadboard compatible)
  • Plug-and-play I2C connectivity
  • Cable-based quick connection support
🔹 Interrupt & Smart Features
  • Two configurable interrupt pins
Built-in Detection Functions:
  • Step counting
  • Activity recognition
  • Tap / double-tap detection
  • Orientation / tilt detection
  • Motion / wake-up detection
👉 Reduces MCU processing load (on-chip intelligence)
🔹 Internal Architecture
  • MEMS accelerometer sensor
  • ADC (12-bit)
  • Digital signal processor
  • Motion recognition engine
  • Interrupt controller
🔹 Functional Behavior
  • Continuously measures acceleration
  • Can operate in:
    • Low-power mode
    • High-performance mode
  • Generates interrupts on:
    • Motion events
    • Orientation change
🔹 Performance Characteristics
  • Ultra-low noise measurement
  • High stability and repeatability
  • Optimized for low-frequency motion detection
  • Suitable for always-on sensing
🔹 Key Technical Features
  • 3-axis digital acceleration sensing
  • Ultra-low power consumption
  • 12-bit resolution
  • Multiple selectable ranges
  • Built-in motion intelligence
  • I2C & SPI support
  • STEMMA QT / Qwiic compatibility
  • Breadboard-friendly design
🔹 Advantages
  • Very low power (best in class for accelerometers)
  • Integrated step counting & activity detection
  • Easy wiring via Qwiic/STEMMA
  • Flexible configuration
  • High accuracy for motion sensing
🔹 Limitations
  • No gyroscope (only acceleration)
  • Limited resolution compared to 16-bit IMUs
  • Not ideal for high-speed vibration analysis
  • Requires configuration for advanced features
🔹 Applications
  • Wearable devices (fitness trackers)
  • Step counters / activity monitors
  • IoT motion detection systems
  • Smart home automation
  • Tilt/orientation sensing
  • Low-power embedded systems
🔹 Technical Summary
The BMA400 breakout is an ultra-low power 3-axis accelerometer module that:
  • Provides accurate motion sensing with minimal power usage
  • Includes built-in motion intelligence (step, tap, orientation)
  • Supports easy integration via Qwiic/STEMMA and I2C
👉 It is best suited for:
  • Battery-powered projects
  • Wearables and always-on sensing systems
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