9 DOF Wearable IMU

Description

Sensor Maestros developed the SFM2 9 DOF Wearable IMU to allow users to monitor and capture movement data in 3D.  A design goal for the SFM2 was provide data logging for both RAW and Sensor Fusion Output data with precision time-stamping.  We also included a Pressure/Altitude sensor and we even included a Temperature and Humidity sensors.  Another design goal was to make it HIGHLY configurable and made it so that all sensors including the Pressure and Temperature, Humidity Sensors have individual Data Streams.  Each of the data streams can be enabled or disabled.  Furthermore we developed the SFM2 and the SENSR-LOGR mobile app so that multiple SFM2’s can be connected simultaneously and be synchronized.  To prove this capability we tested using 5 SFM2’s simultaneously logging the data to the SENSR-LOGR app.  The SFM2 9 DOF Wearable IMU also provides precision timestamps with +/-25us resolution.  Ultimately the SFM2 was designed to be highly configurable and allow individual sensor configuration.

OEM, Volume Pricing Inquiry Form

SFM2 9 DOF Wearable IMU Specifications

• Small Form Factor Enclosure: 40.9 x 28.1 x 14.5mm with slot for strap for wearing/attaching
• Android and iOS Mobile App for easy configuration, 3D View, and data-logging to CSV file
  • Easy to use BLE Characteristic Map and Services for custom mobile app development
  • Connect 5 or more SFM2’s to a single Mobile Device
  • Scrolling Real-time graphing for Pressure(hPa)/Altimeter, Humidity, and Temperature
  • 4 Default SFM2 Modes: OFF, LOW POWER(26Hz), BALANCED(104Hz), PERFORMANCE(417Hz)
  • Tare and Drag SFM2 3D representation to user defined orientation
  • View BLE & USB/COM Statistics/Throughput analysis
  • Run Self-Test
• USB/COM Port Interface
  • 1Mbps Data rate(ASCII or Binary Output)
  • Connect Multiple SFM2’s to a single computer
  • Same configuration capability as BLE/Mobile App interface
• Ultra Low Power(~80hr battery life in Low Power Mode w/130mAh battery)
  • 1/3 Power Consumption, 1/3 Cost of comparable performance VN100, VN200, VN300 IMU’s
• Ultra Low Drift/High Precision <3°/hr
• Over the Air Firmware Updates
• Automatic Switchover from Battery Power to USB Power

Sensor, Data Stream and Other Features Details

• Individual Sensor Configuration
• Fusion and Raw Sensor Data Streams can be individually enabled. Multiple Streams Simultaneously
  • Data log time stamped sensor data via USB and BLE interface.  Push to Cloud
  • Raw Sensor Data Streams:  3-Axis ACC, GYRO, MAG, and Pressure, Temp, Humdity
  • Fusion Data Streams: (12.5, 26, 52, 104, 208, 417, 833Hz ODR Rates)
    • Quaternion and Tared Quaternion
    • Linear Acceleration
    • Compass Heading and Tilt
    • Euler Angles: Yaw, Pitch, Roll 
    • Configurable Oversampling/Output divider to reduce data rates across BLE and USB interfaces.
• Precision time stamped data with 25us resolution and user configurable offset
  • Allows for Synchronizing multiple SFM2’s
• 3D View of SFM2 using Mobile Apps or Python API Library
• Store custom user configuration, change sensor name, restore factory defaults
• TARE function to zero quaternion coordinate system
• Headtare to allow manual ‘Tare’ adjustment
• Global Reference Frame Enable/Disable 
• User configurable name for allowing multiple SFM2’s in application

The SFM2 can be made available as an OEM model either as an assembled PCB with a lithium polymer battery or as a complete product with an enclosure. Sensor Maestros can completely customize the SFM2 including hardware, firmware, mobile application, and enclosure.

Internal Sensor Specifications

• ACCELEROMETER / LSM6DSO Datasheet
  • ODR RATES: 0, 12.5, 26, 52, 104, 208, 417, 833, 1667Hz
  • FULL SCALE RANGES: 2, 4, 8, 16g Full Scale Range Settings
  • Configurable Power Modes: High Performance, Normal, Ultra Low Power
  • Output Filter Configurations(Low Pass and High Pass Configurations)
  • 2nd Stage Low Pass Filter Enable/Disable
  • Fast Settling Enable/Disable
•  GYRO
  • ODR Rates: 0, 12.5, 26, 52, 104, 208, 417, 833, 1667Hz
  • FULL SCALE RANGES: 125, 250, 500, 1000, 2000 dps
  • Low Pass Filter configurable settings
  • High Performance Enable/Disable
  • High Pass Filter configurable settings
•  MAGNETOMETER / LIS2MDL Datasheet
  • ODR Rates: 0, 12.5, 26, 52, 104Hz(Calibrated and Temperature Compensated)
  • Low Power Enable/Disable
  • Low Pass Filter Enable/Disable
• PRESSURE/ALTIMETER: 1, 10, 25, 50, 75, 100Hz / LPS22HH Datasheet
  • HIGH & LOW Alarms configurable by user
  • TARE function to zero Altitude
• Temp/Humidity: Continuous or Sample Interval Based(user configurable)

Applications

• Sports and Fitness Motion Monitoring and Recording
• Absolute Orientation
• E-Compass Heading
• Drone Control
• Stabilization Control
• Vibration Analysis
• Shock and Motion Detection
• Inclinometer and Angle Measurement

Additional Software

• PyGATT on Raspberry Pi example code
• Python ASCII Command Test software

OEM Customizable:

• Custom Hardware, Firmware, Application, Mobile App Development.
  • Customized Enclosure
  • Larger Battery for extended battery life
  • Additional sensors
  • Cloud connectivity
  • OEM/Customized Mobile App
  • OEM/Customized firmware application

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