Data Sheet

5/29/2019 PhidgetSpatial Precision 3/3/3 High Resolution - 1044_1B at Phidgets
https://www.phidgets.com/?tier=3&catid=10&pcid=8&prodid=1158 9/11
Orientation
When working with an accelerometer it is important to know which is the positive and negative direction on each of the axes. This can
be determined by orienting the accelerometer along each axis and checking the output. The above image shows what the axis
readings should be for each orientation of the 1044.
For more information on how to use the accelerometer, check the Accelerometer Primer.
3-Axis Gyroscope
For more information on the gyroscope, see the Gyroscope Primer.
3-Axis Magnetometer (Compass)
The magnetometer reports the sum of all magnetic elds acting on the 1044. The earth's magnetic eld is only one source that affects
this measurement. In order to get accurate bearing data from the magnetometer - (i.e. to nd magnetic north as a compass) any
interfering magnetic effects need to be calibrated out. For more information about calibration, see the section below, or the Compass
Primer.
Any magnetic eld that is stationary with respect to the 1044, and less than ± 3 Gauss, can be calibrated out of the magnetic eld
measurement. This includes both hard and soft iron effects caused by nearby ferrous and magnetic materials. Interfering magnetic
elds that vary in strength and orientation with respect to the 1044 cannot be easily calibrated out.
Magnetic eld data will become unavailable during every other sample as the compass performs internal calibrations. When this
happens, the magneticField array in the SpatialData structure will either have a length of zero, or each element will equal PUNK_DBL,
depending on the API being used. This needs to be handled explicitly in the event handling code to avoid erroneous program behavior.
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