We used a sensor in a pebble that when it moves we could have acceleration statistics. but the outputs are labeled with some titles which I'm not sure how I can use them to produce a graph (time series graph; Acceleration-Time) with these outputs.
some of the outputs are:
Time - %int(ChipTimeUS) - %float(OrientPitch) - %float(OrientYaw) - %float(OrientRoll) - %float(GyroQuatX) - %float(GyroQuatY) - %float(GyroQuatZ) - %float(GyroQuatW) - %float(CorrectedAccelX) - %float(CorrectedAccelY) - %float(CorrectedAccelZ) - %float(LinearAccelX) - %float(LinearAccelY) - %float(LinearAccelZ)
I would appreciate it for any helps.
Thanks in advance
You have a sensor, which apparently calculates and gives you the quaternion to describe orientation in four dimensions, so you won't have to. Very handy.
The acceleration, if you just want a net magnitude, would be in the vector sum (sqrt(x2+y2+z2)) of the LinearAccel values. The Corrected values could be corrected for orientation only, but might be controlled by parameters to also do scaling or offsets.
Hope this helps,
Olof Dahlberg
Hello Hamed,
As Olof has stated, your electronics is already giving you the calculated data output.
May be the following explanation will help you understand what it is -
Time - %int(ChipTimeUS) - %float(OrientPitch) - %float(OrientYaw) - %float(OrientRoll) - %float(GyroQuatX) - %float(GyroQuatY) - %float(GyroQuatZ) - %float(GyroQuatW) - %float(CorrectedAccelX) - %float(CorrectedAccelY) - %float(CorrectedAccelZ) - %float(LinearAccelX) - %float(LinearAccelY) - %float(LinearAccelZ)
Time - %int(ChipTimeUS) -This is an INTEGER VARIABLE giving the TIME as per US format as programmed and maintained by the Sensor or the Real_Time_Clock chip.
All other variables are defined as floating point values.
Orientation is specified as YAW, ROLL and PITCH Axis.
There is (Probably!) the raw data from the Gyroscope with X, Y, Z and the SUM output.
Which (might be!) is then corrected to give you the corrected Acceleration value and later converted into equivalent Linear Acceleration data/variables.
Hope this is helpful to you.
-PRASANNA WAICHAL
Oh Thanks to you dear Olof and Prasanna. that was helpful. I think I need to consider gravity compensation too. there must be a conversion. If you know anything I would appreciate it.
Refer Basic Physics Books.
Acceleration due to Gravity is g = 9.81meters per seconds squared !
Best luck!
I know g=9.81. the thing I meant was about the gravity affect on the pebble acceleration not the constant
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