Hello,
I use PhidgetSpatial 3/3/3 to measure the pitch.
I use also an inclinometer Disto D8 from Leica as reference.
Both devices are laid on perfectly horizontal board mounted on tripod used by photographers.
This is my methode to calculate the pitch:
- Read all 3 axes of acceleration then normalize all 3 accelerations.
- Pitch = arcsin(accelerationY) *(180 / PI);
Tilt my board up /down.
The pitch results in degrees:
Disto Phidgets
-60 -58.7
-50 -49.1
-40 -39.4
-30 -29.7
-20 -20
-10 -10.4
0 0.3
10 9.1
20 18.6
30 28.3
40 38
50 47.7
60 57.6
As you can see, at 0, Phidgets gives 0.3
The range “up direction” [0,60] gives differents result from range “down” [0,-60].
Range [0,-60] is closer to the expected values but it’s not accurate.
How can I use this Phidgets reliably ?
Internally calibrated at the factory
Rigorously tested to ensure “real life” data
This is what I read in Phidgets marketing website.
Can I trust data coming from this board ? I think I don’t need a calibration as the device is calibrated at the factory.
What is the typical error range / precision of this board in “real life” ( 300μG ?)?