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ADXL202AQC датащи(PDF) 9 Page - Analog Devices |
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ADXL202AQC датащи(HTML) 9 Page - Analog Devices |
9 / 11 page 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 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 OF TILT 1 g 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 mg per degree of tilt, but at 45 ° degrees it is changing only at 12.2 mg 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 0 –90 1 g X OUTPUT Y OUTPUT ( g) X AXIS PER PER ORIENTATION DEGREE OF DEGREE OF TO HORIZON ( ) X OUTPUT ( g) TILT (m g) Y OUTPUT ( g) TILT (mg) –90 –1.000 –0.2 0.000 17.5 –75 –0.966 4.4 0.259 16.9 –60 –0.866 8.6 0.500 15.2 –45 –0.707 12.2 0.707 12.4 –30 –0.500 15.0 0.866 8.9 –15 –0.259 16.8 0.966 4.7 – 0 0.000 17.5 1.000 0.2 – 15 0.259 16.9 0.966 –4.4 – 30 0.500 15.2 0.866 –8.6 – 45 0.707 12.4 0.707 –12.2 – 60 0.866 8.9 0.500 –15.0 – 75 0.966 4.7 0.259 –16.8 – 90 1.000 0.2 0.000 –17.5 Figure 14. How the X and Y Axes Respond to Changes in Tilt |
Аналогичный номер детали - ADXL202AQC |
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Аналогичное описание - ADXL202AQC |
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