How to get up/gravity-vector from 3-axis accelerometer data?

In summary, the person is struggling with an iPhone augmented reality application project and is looking for resources or advice on how to use accelerometer data and get it in 360 degrees. They are open to any explanations or formulas that can help them understand the problem and find a solution. They are also seeking any advice or tips from others.
  • #1
Gerra
2
0
Sorry for the question duplication, but I've spent hours googling, and just have no idea where to start.

Just started an iPhone augmented reality application project, and stuck.
The accelerometer data provided this way - http://www.tuaw.com/2007/09/10/iphone-coding-using-the-accelerometer/".

The other problem is to get the data in 360 degrees.

The best would be a site/article/post/anything that explains me the whole problem/solution from the ground up, but if there is any "ready-made" formula with all the trigonometry, would appreciate as well.

If there's any advice, please don't hesitate to share with me, thanks in advance.
 
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  • #2
Yesterday I suddenly realized that they are kinda equal.
 

1. How does a 3-axis accelerometer measure gravity?

A 3-axis accelerometer measures gravity by detecting the acceleration caused by it. Gravity is a constant force that pulls objects towards the center of the Earth. A 3-axis accelerometer is able to measure the acceleration in three different directions, which allows it to determine the direction and strength of the force of gravity.

2. What is the relationship between accelerometer data and gravity?

The accelerometer data is directly related to the force of gravity acting on the device. The data is measured in units of acceleration, such as meters per second squared. This acceleration value can then be used to calculate the corresponding force of gravity using Newton's second law of motion, F=ma, where F is the force of gravity, m is the mass of the object, and a is the acceleration due to gravity.

3. How can you get up or down direction from accelerometer data?

The accelerometer data can be used to determine the up or down direction by looking at the direction of the acceleration vector. If the device is stationary, the acceleration vector will point towards the ground, indicating the down direction. If the device is in motion, the direction of the acceleration vector can be used to determine the direction of movement, which can then be used to determine the up or down direction.

4. Can a 3-axis accelerometer be used to measure other forces besides gravity?

Yes, a 3-axis accelerometer can be used to measure other forces besides gravity. Since it is able to measure acceleration in three different directions, it can also detect other forces acting on the device, such as linear or rotational forces. However, the device must be properly calibrated and the data must be interpreted correctly in order to accurately measure these forces.

5. How can you convert accelerometer data into a gravity vector?

To convert accelerometer data into a gravity vector, the data must first be filtered to remove any noise or interference. Then, the individual acceleration values in each direction can be used to calculate the corresponding force of gravity. Finally, these values can be combined to create a 3D gravity vector, with each component representing the force of gravity in the x, y, and z directions respectively.

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