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SmartElex BMA400 Triple Axis Accelerometer Breakout

SmartElex BMA400 Triple Axis Accelerometer Breakout

β‚Ή294.00Price
πŸ” Overview
The module is based on the BMA400 ultra-low-power 3-axis accelerometer IC, a high-precision MEMS motion sensor designed for low-power, always-on applications.
  • Measures acceleration along:
    • X-axis
    • Y-axis
    • Z-axis
  • Detects:
    • Motion
    • Tilt
    • Orientation
    • Vibration
πŸ‘‰ It is optimized for ultra-low power consumption with high accuracy.
βš™οΈ Working Principle
🧠 MEMS Capacitive Sensing
  • Contains a microscopic suspended mass structure
  • When acceleration occurs:
    • Mass shifts slightly
    • Changes capacitance between electrodes
πŸ”„ Signal Conversion
  • Capacitance variation β†’ electrical signal
  • Internal ADC converts signal into digital acceleration data
πŸ‘‰ Output represents acceleration in g (gravity units).
πŸ“Š Measurement Characteristics
Acceleration Range (Selectable)
  • Β±2g
  • Β±4g
  • Β±8g
  • Β±16g
Resolution
  • Up to 12-bit / 16-bit equivalent resolution (mode dependent)
  • High sensitivity for small motion detection
Output Data
  • Digital acceleration values:
    • X, Y, Z axes
⚑ Electrical Characteristics
  • Supply voltage: 1.71V to 3.6V
  • Ultra-low power consumption:
    • ~0.8 Β΅A (low-power mode)
    • Higher in performance modes
πŸ‘‰ Ideal for battery-powered and always-on systems.
πŸ”— Communication Interface
  • IΒ²C interface
  • SPI interface
πŸ‘‰ Flexible and easy integration with microcontrollers.
🧠 Internal Features
βœ” Ultra-Low Power Design
  • Designed for continuous operation with minimal energy use
βœ” Built-in Step Counter
  • Detects steps using motion patterns
βœ” Activity / Inactivity Detection
  • Detects:
    • Movement
    • No-motion conditions
βœ” Interrupt Engine
  • Generates interrupts for:
    • Motion
    • Orientation
    • Tap events
βœ” FIFO Buffer
  • Stores multiple samples
  • Reduces processor load
βœ” Digital Filtering
  • Built-in filters reduce noise
  • Improves measurement stability
πŸ”„ Operating Behavior
βœ” Static Measurement
  • Measures gravity β†’ used for tilt detection
βœ” Dynamic Measurement
  • Detects:
    • Motion
    • Vibration
    • Movement patterns
βœ” Always-On Monitoring
  • Can run continuously with minimal power impact
🌑️ Environmental Characteristics
  • Operating temperature: βˆ’40Β°C to +85Β°C
  • Stable across environmental conditions
⚠️ Limitations
  • Cannot measure:
    • Absolute position
  • Accuracy affected by:
    • Mechanical vibrations
    • Noise
  • Drift may occur in long-term motion integration
πŸ”Œ Typical Pin Configuration
  • VCC β†’ Power supply
  • GND β†’ Ground
  • SDA / MOSI β†’ Data
  • SCL / SCK β†’ Clock
  • CS β†’ Chip select (SPI)
  • INT β†’ Interrupt output
🧩 Functional Role
The module acts as a:
  • Motion sensor
  • Tilt/orientation detector
  • Activity monitoring device
  • Low-power inertial sensing component
🏁 Summary
The SmartElex BMA400 Accelerometer Breakout is a high-efficiency motion sensing module that:
  • Measures 3-axis acceleration (X, Y, Z)
  • Uses MEMS capacitive sensing technology
  • Provides digital output via IΒ²C/SPI
  • Offers ultra-low power consumption (~Β΅A level)
  • Includes step counting, interrupts, and filtering
  • Is optimized for always-on, battery-powered motion detection systems
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