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MTw Development Kit

Wireless motion trackers set

Important: Read the End-of-Life notice

Development kit with wireless, highly accurate, small and lightweight 3D human motion trackers. Used in a body area network, this portable and unobtrusive wireless system is ideal for developing customized wearable solutions.

  • Completely wireless motion trackers
  • Sensor fusion algorithms ensure highly accurate, drift-free output
  • Fast click-in of MTw into the specially designed body straps

Overview

Important: End-of-Life

On October 29, 2015, Xsens has issued an End-of-Life (EoL) notice for the 1st generation of MTw products. Details on the EoL can be found in the End of Life Notice MTw 1st generation (PDF). Please refer to the new MTw Awinda for the 2nd generation MTw.

 

  • Completely wireless and lightweight trackers
  • Accurate output of 3D orientation and inertial data
  • Precise inter-tracker synchronization
  • Retransmission of data while suffering of wireless outages
  • Intuitive Windows software for real-time view, easy logging and export
  • SDK with example code facilitating real-time access to all levels of component data
  • Easy synchronization with other systems
  • Use anywhere: outside, in the office, no lab or simulated environment required
  • Fast click-in of MTw into the specially designed body straps
  • Ideal for research projects, product integration and Human-Robot Interaction

 

Design highlights

Click-in

Click-in straps

The MTw trackers click easily into the special designed body straps. Ensuring minimal subject preparation time.

Blinking-LED

Blinking LED

The LED blinks in sync with the LED of the Awinda Master (Station or Dongle) giving the users the visual feedback that its synchronized.

No-buttons

No buttons

The MTw’s are operated without the use of buttons. While not using them, they will go into a power-saving sleep mode automatically

Specifications

MTw setupThe MTw Development Kit includes

  • 1-32 MTw wireless motion trackers
  • 1 x Awinda station
  • 1 x Awinda USB dongle
  • 1 x Set of full-body click-in straps
  • MT Manager software and Software Development Kit
  • USB cable and power adapter
  • Suitcase

Physical properties MTw Motion Tracker

  • 27 grams
  • 34.5 x 57.8 x 14.5 mm (W x L x H)

Motion trackers orientation performance

Static accuracy (Roll/Pitch) < 0.5 deg
Static Accuracy < 1 deg
Dynamic Accuracy 2 deg RMS
Angular Resolution 0.05 deg

MTw Development Kit

Wireless communication range for Awinda Station (typical)

Outdoor 50 meters (164 ft.)
Indoor open space 50 meters (164 ft.)
Indoor office 20 meters (65 ft.)

Update rates

MTw internal sampling rate 1800 Hz.
Max MTw update rate depending on amount of MTw’s used, e.g.:
1 MTw 120 Hz.
6 Mtw 75 Hz.
12 MTw 50 Hz

Wireless communication range for Awinda Station (typical)

Outdoor 50 meters (164 ft.)
Indoor open space 50 meters (164 ft.)
Indoor office 20 meters (65 ft.)

 

Output Data

  • 3D Orientation (Euler, quaternions, rotation matrices)
  • 3D Acceleration
  • 3D Rate of turn
  • Awinda Station MTw3D Earth magnetic field
  • Static pressure

Synchronization

The Awinda Station is able to send or accept synchronization signals to sync with other data acquisition systems. The synchronization signals are fully configurable within MVN Studio Pro.

  • 2 BNC ports for sync-in (Slave mode)
  • 2 BNC ports for sync-out (Master mode)
  • Industry standard 3.3V TTL pulses

 

Applications

Biomechanical analysis is used in:
Biomechanical analysis, Sports performance science, Rehabilitation, Ergonomics, Human Machine Interaction and Head mounted displays and head trackers.

Cases

Robo Sally – Bomb disposal robot
Robo Sally
Remote controled bomb disposal robot
Bounden – Mobile game with Xsens technology
Bounden
Mobile game with Xsens technology
Valedo – Back pain therapy with Xsens technology
Valedo
Back pain therapy with Xsens technology
Assessment of lumbar spine forces during maneuvering of different lift devices during patient handling
Lumbar spine forces during maneuvering
Assessment of lumbar spine forces during maneuvering of different lift devices
Development and validation of an inertial sensor based human model with integrated compensation of errors
Human Kinematics software
Development and validation of an inertial sensor based human model with integrated compensation of errors
A normative data-set of Timed Up and Go component times under different conditions
Timed Up and Go
A normative data-set of Timed Up and Go component times under different conditions
Wireless measurement of scapular dyskinesis with IMMS
Scapular dyskinesis
Wireless measurement of scapular dyskinesis with IMMS by VU University Medical Center
Advanced Diagnosis and Assessment of Tremor
Assessment of Tremor
Advanced Diagnosis and Assessment of Tremor by University of Bristol.
Accelerometry-based prediction of Center of Pressure and Center of Mass during motor tasks
Center of Pressure and Mass
Accelerometry-based prediction of Center of Pressure and Center of Mass during motor tasks by the University of Bologna.
A novel wearable measurement system for ambulatory assessment of joint loading in the occupational setting
Wearable measurement system
A wearable measurement system for ambulatory assessment by Harvard School of Public Health.
Interactive Sonification of Human Movements for Stroke Rehabilitation
Stroke Rehabilitation
Interactive Sonification of Human Movements for Stroke Rehabilitation by the Leibniz University Hanover.
Stair climbing: a comparison with an optical tracking device
Stair climbing
Stair climbing: a comparison with an optical tracking device by King's College London.
IMMS improves spasticity assessment in children with cerebral palsy
Spasticity assessment
IMMS improves spasticity assessment in children with cerebral palsy by VU University Medical Center
“Outwalk”: a novel protocol for clinical gait analysis based on inertial and magnetic sensors
Outwalk
“Outwalk”, with its high potential, can be spread in a...
Baseball pitchers analysis
Baseball pitchers analysis
Baseball pitchers analysis by INAIL Prostheses Centre.

Software

Xsens MT Software SuiteMT Software Suite

The MTw Development Kit includes the MT Software Suite containing:

MT Manager Software

An easy-to-use graphical user interface allowing real-time view of 3D orientation and sensor data, recording of data streamed from the MTw’s through the Awinda Station and export to ASCII files for further analysis.

 

Software Development Kit

The SDK gives direct and real-time access to the output of the MTw motion trackers, allowing users to configure and easily integrate the MTw’s in their own applications.

It includes drivers for various operating systems, documentation and various other useful tools. Communication is made easy with the Xsens Device API (XDA) which is completely in C-code. The MT SDK includes the following development tools:

  • C++ wrapper
  • Examples for C, C++ and Matlab.
  • Supported operating systems: Windows and Linux.
  • DLL for both 32-bit and 64-bit systems.
  • Extensive documentation on the MTw, the XBus protocol and the SDK (PDF and HTML)

 

More information and download of the MT Software Suite

 

Synchronization

 

Tried and tested synchronization of data acquisition systems with Xsens systems:

Xsens Synchronization with EMG Systems

Synchronizing with Noraxon EMG Link
Synchronizing with Cometa Wave EMG Link
Synchronizing with Delsys Trigno EMG Link

Xsens Synchronization with Pressure Mats

Synchronize with GAITRite Pressure Mat Link

Xsens Synchronization with Optical Systems

Synchronize with Vicon Link

Published Papers

Effectiveness of the Virtual Reality System Toyra on Upper Limb Function in People with Tetraplegia: A Pilot Randomized Clinical Trial
Journal Articles, Product: Xbus Kit
I. Dimbwadyo-Terrer, A. Gil-Agudo, A. Segura-Fragoso, A. de los Reyes-Guzmán, F. Trincado-Alonso, S. Piazza, and B. Polonio-López
BioMed...
Quantifying performance and effects of load carriage during a challenging balancing task using an array of wireless inertial sensors
Journal Articles, Product: MTw, MVN BIOMECH
Stephen M. Cain, Ryan S. McGinnis, Steven P. Davidson, Rachel V. Vitali, Noel C. Perkins, Scott G. McLean
DOI:...
Towards the importance of minimum toe clearance in level ground walking in a healthy elderly population
Journal Articles, Product: MTw
Dennis Hamacher, Daniel Hamacher, Lutz Schega
Gait...
A cognitive dual task affects gait variability in patients suffering from chronic low back pain
Journal Articles, Product: MTw
Dennis Hamacher, Daniel Hamacher & Lutz Schega
Exp...
Lumbopelvic rhythm during forward and backward sagittal trunk rotations: combined in vivo measurement with inertial tracking device and biomechanical modeling
Journal Articles, Product: MTx, Xbus Kit
Tafazzol A, Arjmand N, Shirazi-Adl A, Parnianpour M
2014...
IMU-Based Joint Angle Measurement for Gait Analysis
Journal Articles, Product: MTw
Thomas Seel, Jorg Raisch and Thomas Schauer
Sensors...

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