Jordi Evers - Medische Elektronica

DynaPort Sensors for Moving Technology

The DynaPort consists of a small and light case containing a tri-axial accelerometer, a rechargeable battery, an USB connection, and raw data storage on a MicroSD card. The used accelerometer has a DC response to the Earth’s gravitational field, and uses a seismic or a proof mass suspended by a spring structure in a case. This sensor responds to both slow and fast changes in acceleration. These favorable features for posture and motion detection are reasons for us to use seismic accelerometers.

LED indication about system status
USB connector for charging and communication

ACCELERATION SENSOR
Inclination, indicated by the amount of gravity measured, provides information about the angle of the sensor surface compared to the horizontal plane. The inclination and acceleration of body segments reveal information about posture and motion of a person. The sensor has a selectable full scale of ±2g or ±6g and is capable of measuring acceleration over a bandwidth of 640 Hz for all axes. The resolution is 1mg in the 2g range and ±3mg in the ±6g range. The sample frequency has been set to 100Hz.

Jordi Evers, McRoberts