122-28029 Parallax Inc, 122-28029 Datasheet - Page 104
122-28029
Manufacturer Part Number
122-28029
Description
GUIDE STUDENT SMART SENSORS
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
Specifications of 122-28029
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Smart Sensors
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Page 92 · Smart Sensors and Applications
Measuring Tilt Angle On the Vertical Plane
The angle of your board's clockwise rotation in the vertical plane (θ) is the arctangent of
the gravity's effect on the MX2125's y-axis (A
shown in Figure 3-20.
Here are a few examples of what the accelerometer detects and how it relates to the
arctangent of the ratio of A
the 0° mark. If θ is 0°, then A
0/1 is 0°.
Figure 3-21: Accelerometer Rotated 0°
When the accelerometer is rotated 30° clockwise, as shown in Figure 3-22, the
component of gravity acting on the accelerometer's x-axis is approximately √3/2 g. The
tan
−
1
⎛
⎜
⎝
0
1
⎞
⎟
⎠
=
0
°
y
to A
y
senses 0-gravity (g), and A
x
. Figure 3-21 shows what the accelerometer senses at
θ
=
tan
y
−
) divided by its effect on its x-axis (A
1
⎛
⎜
⎜
⎝
A
A
Y
X
⎞
⎟
⎟
⎠
x
senses 1 g, the arctangent of
Figure 3-20
Clockwise Vertical
Rotation
x
), as
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