Accelerometer Definition and 163 Threads

Hi everyone, I am currently trying to recognize different activities such as walking, sitting and falling, using a watch which features a 3 axis accelerometer. Currently I have performed 1 minute tests of each activity 20 times but I am struggling on what to do with the data. Does anyone...

Hello everyone, i'm new to this forum and this is my first post. My question is: how to get pitch and roll of a moving vehicle using an 3-axis accelerometer? accelerometer values are the same when vehicle is stopped? Thanks in advance.

Hi, I've received a new accelerometer with a scale factor declared in datasheet as: 800 mV/g @ 1.5g. I googled and searched the forum but still can't fully be sure I understand the accelerometer and its functioning, so please correct me where I'm wrong: One thing that very helped me to get...

hi how can i convert accelerometer vector to quaternion and then convert it to pitch and roll? i want full 360 degrees of roll and pitch

Hey, I'm in the process of creating a device that when attached to an object can sense vibrations(not sensitive) then numercially counter each occurence on a digital display on the device. I'm trying to make the device about 2in x 2in. I need some help making the circuit board and was wondering...

Hi all! I'm working on a system that uses an accelerometer to measure pitch. I know how I can calculate the pitch angle from the accelerometer readings, but I've another problem. At the start I never know how the accelerometer is mounted. So normally on at the start the accelerometer...

The question is given. 1. (Capacitive accelerometer) In this problem, we would like to understand the capacitance change of an accelerometer shown below. Blue area represents movable conductive silicon material with a thickness of h. Red area represents anchored silicon areas. Assume that the...

Hello. I am quite new here and need a little bit of help with an invention I am working on. I'll try to just ask for help on different parts as to not have you guys actually invent it, unless someone is interested in an investment relationship. anywhoo... First off, I have 8 variable voltages...

I thought this was interesting. My guess is that it will be published in Physical Review Letters. We know of Jorma Louko from other work. http://arxiv.org/pdf/1007.5052 http://arxiv.org/abs/1007.5052 Quantum accelerometer: distinguishing inertial Bob from his accelerated twin Rob by a local...

Hello I am developing a programme in C that uses a Tri Axial Accelerometer and I have become bogged down with the maths for correcting cross axis misalignment errors and was wondering if someone could help me please. I have two papers on the subject and I have worked my way through the axis...

Hello, I am seeking advice on how to use an accelerometer as a switch on a CubeSat form factor. Incase you are unfamiliar, a cubesat is 1cm cube device designed to go into space. The problem is that the CubeSat must not have any electronics active during launch. I am seeking to use an...

Hi everyone! I'm trying to work with an accelerometer to measure distances (straight line) but I'm not being very successful.. I've made this experiment: attached the accelerometer to a electric slot car and accelerate it to the maximum until it reached the end of a straight line track...

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...

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...

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...

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/"...

Let's stick to SR here. Given an accelerometer, one can determine locally if one is moving inertially or not? Can one determine locally if a particular instrument is an accelerometer? If one has no accelerometer, then inertial movement has to be determined by absence of forces on the...

Hi All, I am working with accelerometer,i have 3-axis accelerometer,Now i have X,Y,Z points and i want to Find the acceleration, How can i find the acceleration? any formula any help? and at which acceleration i could say that now the particle is static i.e not in motion? Regards, Aamir

How does an altimeter detect altitude? How does an accelerometer detect acceleration?

Hi, I am an engineering student that needs help using an accelerometer and a gyroscope. I'm not sure where to begin. How can I setup the sensors to output readable data to a computer. Do I use a microcontroller? Do I need to program anything? I am just in need of help. Anything would be...

I'm almost to timid to ask, I haven't had a math class in over 10 years and even longer for physics. My apologies if I dumb down the forum a little bit. I'm grabbing accelerometer data out of the iPhone of someone doing a throwing motion. I'm not really sure if it is possible to get the...

I have the intrinsic noise PSD spec for Honeywell's QA3000 accels, and I need to find the velocity random walk due to noise to show that I'm within my allowable. The PSD is given in units of g^2/Hz vs Hz. I'm given a velocity random walk due to noise spec of 15 (micro-m/s)/rt(s) that I must be...

I've been playing around with an accelerometer I've got hold of, yet I'm having a little difficulty understanding it's output. Electronics isn't my strong point. I understand the output is a voltage, but the I'm finding the values hard to interpret. When connected it outputs data in the...

Hi all, I've been trying to develop this excel macro for mapping out a train track and locating kinks. It's been going well so far except that when the accelerometer is not exactly level with the ground, the acceleration due to gravity (9.8 m/s^2) is not only effective in the z-direction...

I need something small to put on my hand to that can detect movement. I've been thinking of a piezoelectric sensor but I don't know much about them (I don't know much about anything electric). Can I use this to detect movements in my hand?

accelerometer help pleasez hi everybody..i have homework to design accelerometer can anyone help me from where to start i hav no idea about accelerometers know only that it measures acceleration of motors no experience to design..which sensors to use..or where can i find sample circuit diagram...

I am in need of a little guidance. I am trying to calculate the speed of travel using an ADXL330 accelerometer, with values in the X Y and Z directions. I know this isn't a particularly accurate way of calculating the speed of travel but its this is the only component i have at my disposal...

What I am trying to do: I am placing my accelerometer [parallax BS2] ontop of my amigobot. I move the amigobot 1 meter foward with the acceleromter ontop while taking data for x and y direction. I then read the data to my computer and plot it. Data: The plot shows the data jumping up and...

Hello Everybody, Currently I am working on my diploma thesis, which is to provide an auxiliary vector for a WLAN based RTLS (Real-time locating system). Because it has flaws in it, that come from losing IP packets, I have to construct an auxiliary system to it based on vectors. I am...

I have joined this forum in need of some help. I am poor at physics but not too bad at math. I am making a device to place in a car to act as a dead reckoning navigation system using a digital compass and a 3 axis accelerometer. I tried measuring the speed of the car using one plane (axis)...

Hi all, got a little physics problem that I wonder if anyone could help me with. I'm using an accelerometer to record the rate of acceleration of a vehicle over time (1500kg). With this data I am calculating speed and distance traveled over time. I'm now trying to figure out a way to calculate...

I am using a cellphone with 2 accelerometers in it. So, in all I have 2*3 readings from accelerometer ( 3--> x,y, z axis). I am trying to find the orientation (up and down) and the tilt/angle of the cell phone. The cell phone won't be kept in the horizontal surface, instead it would be rotated...

I wanted to use the raw data from my iPhone accelerometer to track displacement. I downloaded an app called Accelerometer Data Pro. It is pretty fun. You slide a bar to start sampling, walk around the room, and then slide the same bar to stop sampling. The time series results can then be...

So, the title says it all. background info on this question. I purchased a Herman Digital Trainer. It measure the impact of punches and kicks based on G-Forces. I was wondering if it was possible to a G-Force reading into Pounds per square inch reading. This is the websites description...

I am having a hard time finding a proper pwm to go with DE-ACCM3D2. Then outputting to a LCD display.

Hi, I wonder if there is anyone who can help me with a problem i have. I have a device that includes a simple 3d accelerometer. The device is a handheld device and my challenge is to figure out the path that the device moves in space relative to its starting position. I would like to plot...

Hi All, Thanks in Advance.Need help on maths related to angular motion.We have a device that returns the acceleration in ax,ay,az for motion along a curve.we are trying to calculate the angle using these acceleration values and the radius (which is fix in our case). Below is what we are...

There's a problem I've been working on for a few days that I can't seem to resolve: There is a model train going around a set track with a 2-D accelerometer mounted along the axis of the train. The accelerometer provides the current x/y acceleration values at a frequency of about once...

This is my first post, so forgive me if I'm in the wrong place! I know this topic has come up before, but I haven't seen quite what I need. I am basically looking for the math behind de-rotating the 3-D vectors (x,y,z) that I read out of an accelerometer, in order to compensate for gravity...

Hi ! I have mounted a tri-axis accelerometer on a telescope which gives me angles for x,y & z axis, is there a method to convert these angles to the ra/dec or alt/az coordinate systems. Any help would be aprreciated

Hi, I am interested in using an accelerometer to calculate the speed of a car. The accelerometer is a triaxial one and gives 3 values of acceleration; x y and z. These can be assumed to be accurate as i have already worked on the calibration of these values so that they come out in gs. Is...

background: I am working with an accelerometer to measure the tilt angle of a mechanical device. The accelerometer reads x, y, z values that can be made into a "gravity vector". The accelerometer can NOT be assumed to mount square with the device. The accelerometer is NOT well calibrated, so the...

Hi, I'm new to the forum. I have a 3 axis accelerometer that I am trying to obtain roll and pitch from. Besides the accelerometer itself, I was provided the raw data values of what each axis will report when it has 0g being applied to it and when it has 1g being applied to it. Using this I...

Greetings, Very simple question for you guys. Suppose I wanted to track my location accurately with no real reference points. And what I mean by that is if take some arbitrary location I'm currently at to be point 0,0 on a 2-dimensional map, is it possible to use only accelerometers to track...

Hello, I am using a tri axial accelerometer for a project that I have just about completed but have just realized that some of math may be flawed with respect to the device output and actual acceleration forces. So the question; as I am using vector subtraction and vector dot products to...

Hi there, I am reading this old journal and found this formulaes. forces on the seismic mass, expressed in inertial reference coordinates, are given by Newton's law as sum of force in x direction = m * x'' sum of force in y direction = m * y'' = Fy = mg the equivalent acceleration...

Hi there, I am doing some measurement using an accelerometer. I am rather confused with regards to whether I should be see an accelerometer as a non-inertial or an inertial sensor. I have with me 2 commercial accelerometers evaluation board (analog to computer interface). One by the...

Hello, I have some accelerometer vector data A (3d vectors x,y,z ) than I have normalized so I guess they are unit vectors. Now what I what to do is to 3d rotate them by another set of normalized accelerometer vector data B so I get a third set of vectors D. I have tried a simple vector...

Accelerometer vs. "acceleration" I'm struggling with the basic semantics of accelerometers. An accelerometer that is at rest will produce an "acceleration" reading for gravity (-9.8m/s^2 on some axis). Based on my intuitive (albeit likely naive) understanding of the principals of physics, an...