Recent content by mark2468

So what is the best way to synchronise them. Is there a formula or just divide by that ammout. e.g. 40/3, 30/3 etc or whatever the sample interval is. Any links with examples of this available? Thanks again.

time intervals are 0.333 seconds.

Hi. I have a set of data representing acceleration. To get the distance I integrate twice using a summation method and looks like: accelleration: 0, 40, 30, -50,-80, -40. velocity: 0, 40, 70, 20, -60, -100. distance: 0, 40, 110, 130, 70, -30. The distance should be zero as...

sorry, am new to forums. I meant the total being the square root of the sum of the squares. This is not equal to 1, and the difference is not the same at each reading. If it was I could easily remove it. Is this common and is there a way to correct it.

Hi. The theoretical total of accelerometer output when in a static position is equal to 1 g. However I get a different result depending on where the device is positioned. Some is greated than 1, some is less. What I have done is determine the max value for each axis and divide all readings...

with the values like: 0.6, 0.6, 0.53. The magnitude is 1 so therefore could just subtract each element from itself to get: 0, 0, 0. but if there acceleration in z direction which gives something like: 0.6, 0.6, 0.6, or 0.6, 0.6, 0.8. and to get a normalized value: 0,0,z...

I'm not really to worried about rest and linear acceleration as i have a method that determines the position. What I really want is to have a reading of 0,0,0 at rest and then if it accelerates let's say for example in the z-plane that the reading might look something like 0,0,0.2 or 0,0,-0.7...

Hi. I was wondering if it is possible to remove the 1g (sqrt(x^2+y^2+z^2)) from an accelerometer when in static positions. When the device is tilted to different positions the total g-force does not equal 1 and differs quite a bit from position to position. I would like to be able to...

The problem is that I know the angle relative to ground (45 degrees in this case) but when the device is moved directly up I am unable so capture this as linear acceleration in the z direction because all 3 axis change. This may seem trivial for some people but i am new to this. Mark.

Thanks for the reply's. I do know the orientation relative to world, the problem is linear acceleration. Its easy get the acceleration in one direction if the other two don't move but what if it moves up at an angle or starts at an angle and moves straight up or straight across linearly...

Hi. I have a problem using 3-axis accelerometer. I understand that the total acceleration is the square root of (x^2 + y^2 + z^2) but I cannot determine the direction of the acceleration. Say the device is at 45 degrees and is moved straight up, how can this vertical motion be detected. I...

Hi. I am using a 3 axis accelerometer for motion detection. I can easily determine the tilt using simple triginometry but cannot determine the movement in a particular direction. For example the sensor is at 45 degrees to the floor so the x,z coordinates are x = 0.5, z = 0.5. So if I keep the...