Calculating Tilt from Accelerometer

Jan 27, 2005 1 Replies

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llienossor 21 years ago

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

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Gareth 21 years ago

ASIN means inverse sine, or arc sine, NOT A*SIN

e.g. SIN(angle) = Ay/1g

Therefore :-

angle = ASIN(Ay/1g)

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