Hi,
I'm using a ADXL311 acceleromoter as a Tilt Sensor. The equations given to calculate the tilt on the x axis or Pitch is ASIN(Ax/1g) and the tilt on the y axis or Roll is ASIN(Ay/1g). g is acceleration due to gravity, Ax & Ay are the amplitudes of the analog voltages from x and y outputs. But I do not know what the A (presumabely amplitude of some sort) before SIN represents.
If anyone has any ideas I would be very grateful.
Thanks.
llienossor
some sort)
arcsin, the functional inverse of the sine function.
Tim.
and the 'Ax', 'Ay' are the accelerations, not the voltages. Arcsine takes a dimensionless parameter and coughs one up. If you're taking the arcsine of something with mismatched dimensions you know you're doing something wrong.
Have a look at the datasheets, the application notes and some trigonometry.
Rene
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