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參數資料
| 型號： | ADXL210JQC-1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Cost 62 g/610 g Dual Axis Accelerometers with Digital Output(124.95 k) |
| 中文描述： | 低成本62 g/610 g雙數字輸出軸與（124.95畝加速度計） |
| 文件頁數： | 9/11頁 |
| 文件大小： | 124K |
| 代理商： | ADXL210JQC-1 |
ADXL202/ADXL210
–9–
REV. B
A DUAL AXIS TILT SENSOR: CONVERTING
ACCELERATION TO TILT
When the accelerometer is oriented so both its X and Y axes are
parallel to the earth’s surface it can be used as a two axis tilt
sensor with a roll and a pitch axis. Once the output signal from
the accelerometer has been converted to an acceleration that
varies between –1
g
and +1
g,
the output tilt in degrees is calcu-
lated as follows:
Pitch
=
ASIN
(
Ax
/1
g
)
Roll
=
ASIN
(
Ay
/1
g
)
Be sure to account for overranges. It is possible for the acceler-
ometers to output a signal greater than
±
1
g
due to vibration,
shock or other accelerations.
MEASURING 360
8
OF TILT
It is possible to measure a full 360
°
of orientation through grav-
ity by using two accelerometers oriented perpendicular to one
another (see Figure 15). When one sensor is reading a maxi-
mum change in output per degree, the other is at its minimum.
Y
X
360
8
OF TILT
1g
Figure 15. Using a Two-Axis Accelerometer to Measure
360
°
of Tilt
STRATEGIES FOR USING THE DUTY CYCLE OUTPUT
WITH MICROCONTROLLERS
Application notes outlining various strategies for using the duty
cycle output with low cost microcontrollers are available from
the factory.
USING THE ADXL202/ADXL210 AS A DUAL AXIS TILT
SENSOR
One of the most popular applications of the ADXL202/ADXL210
is tilt measurement. An accelerometer uses the force of gravity
as an input vector to determine orientation of an object in space.
An accelerometer is most sensitive to tilt when its sensitive axis
is perpendicular to the force of gravity, i.e., parallel to the
earth’s surface. At this orientation its sensitivity to changes in
tilt is highest. When the accelerometer is oriented on axis to
gravity, i.e., near its +1
g
or –1
g
reading, the change in output
acceleration per degree of tilt is negligible. When the accelerom-
eter is perpendicular to gravity, its output will change nearly
17.5 m
g
per degree of tilt, but at 45
°
degrees it is changing only
at 12.2 m
g
per degree and resolution declines. The following
table illustrates the changes in the X and Y axes as the device is
tilted
±
90
°
through gravity.
Y
X
+90
8
0
8
–90
8
1g
X OUTPUT
Y OUTPUT (g
X AXIS
ORIENTATION
TO HORIZON (
8
)
D
PER
DEGREE OF
TILT (mg)
D
PER
DEGREE OF
TILT (mg)
X OUTPUT (g
Y OUTPUT (g
–90
–75
–60
–45
–30
–15
–1.000
–0.966
–0.866
–0.707
–0.500
–0.259
0.000
0.259
0.500
0.707
0.866
0.966
1.000
–0.2
4.4
8.6
12.2
15.0
16.8
17.5
16.9
15.2
12.4
8.9
4.7
0.2
0.000
0.259
0.500
0.707
0.866
0.966
1.000
0.966
0.866
0.707
0.500
0.259
0.000
17.5
16.9
15.2
12.4
8.9
4.7
0.2
–4.4
–8.6
–12.2
–15.0
–16.8
–17.5
–
–
–
–
–
–
–
0
15
30
45
60
75
90
Figure 14. How the X and Y Axes Respond to Changes in
Tilt
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