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Questions tagged [accelerometer]

A sensor to measure acceleration.

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3answers
800 views

Simulate Gyroscope through MEMS accelerometer

Is possible to simulate the Gyroscope using Accelerometer values? I would like to make that in Android Context so using MEMS smartphone accelerometer.
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1answer
946 views

Accelerometer on doors and windows

We have made a mistake. We created this pcb with accelerometer , a very good one (ADXL345) datasheet here and it sleeps ,and waking up on acceleration event. in our case we set it to almost the ...
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1answer
1k views

Accelerometer X/Y/Z “high events”

I'm looking at this accelerometer LIS3DH and the datasheet says that it could enable interrupt generation on X/Y/Z "high" or "low" events. What do these events actually mean? When are "high events" ...
2
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3answers
583 views

Sampling rate for PID control to balance an inverted pendulum using 8051 - AT89c51rc2

I want to control a dc motor(to balance an inverted ;endulum) I want to sample the input from sensors(e.g.: ADXL345) and convert it to digital using a DAC. The maximum output data rate(ODR) for ...
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2answers
225 views

What are the units of the measurements that come out of an accelerometer?

I'm pulling samples out of this accelerometer that I've configured for high resolution mode: and I'm trying to understand the units of what's coming out. Some places online seem to indicate just <...
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1answer
493 views

Weird problem with Intel Edison and IMU MPU-9150

So I am trying to get measurements from the MPU-9150 sensor from Invensense using the Intel Edison. I am able to communicate with the sensor and the values seem sensible. But after a specific number ...
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1answer
355 views

Cancellling Out the Effect of Constant Gravitational Acceleration in a Datalogger

In a design that records not only accelerometer readings (X + Y + Z) but also gyroscopic readings (X + Y + Z) how is it possible to remove the accelerometer readings caused by gravity? I have found ...
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1answer
5k views

Simulating accelerometer in proteus

I am not able to find any libraries for simulating accelerometer in proteus. Is there such a library? If NO, how do i simulate an embedded system that has an accelerometer? Thanks
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4answers
675 views

Linear accelerometer on a rotating platform

I want to measure the linear speed of a vehicle putting the accelerometer on its wheel. Assume the vehicle is moving at a velocity 70 KMPH and its wheel has a radius (R = Radius) 30 CM. I made this ...
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1answer
211 views

Analyzing Accelerometer / Gyroscopic Data [closed]

I have created a data logger that logs acceleration and Gyroscopic data on to an SD card. The logged data is about 1.5GB in the form of txt files. I wish to perform thorough analysis on this data via ...
4
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1answer
443 views

Can I reduce energy consumption if I disable accelerometer's axes?

I'm using LIS3DH accelerometer, a 3 axes accelerometer to build a low energy consumption device. For now I just need the Y axis. If I disable X and Z, can I save more energy or the accelerometer use ...
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1answer
500 views

Normalize values from different MEMS 3-axis accelerometers

I have to find a solution to uniform values on 3-axis accelerometers on different android devices. I mean, a device with a specific accelerometer, subjected to the same acceleration, return values, ...
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1answer
70 views

How do wearables track exercises without taking input from user?

Recently there have been wearable devices that can track your exercises and reps (eg bench press, push ups, pull ups) without the user telling them. What technology do they use to track these ...
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2answers
295 views

Accelerometer sensitivity range

I'm looking at the KX023 and it seems to have a 64 counts/g sensitivity. Its datasheet specifies the following What I don't quite understand is why there're two sets of figures. The top set goes up ...
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0answers
196 views

Is “transient detection” exclusive to Freescale?

I'd like to detect the dynamic component of acceleration, i.e. the change in acceleration, and generate an interrupt when such change is detected. I see that MMA8451/2/3 calls this "Transient ...
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2answers
136 views

Unreasonably high current draw

With the MMA8452, it claims that it draws 44uA when ODR = 100Hz in Normal Mode. However, I'm measuring 1.5mA when ODR = 100Hz. Does anyone know how this could be the case? In Low Power Mode, I'm ...
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1answer
252 views

Accelerometers and transient acceleration

I'm trying to understand the notion of transient acceleration threshold. I'm working with the popular MMA8452 and the way I understand transient acceleration is that it represents the dynamic ...
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2answers
114 views

How do you make a usb device thats just an accelerometer

So I'm trying to do this with as few components as possible. Also, If possible I would like to skip the microcontroller all together. So how would it be done with a triple axis accelerometer? Any ...
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3answers
150 views

Do registers on a chip wipe when disconnected from the power?

I'm making a project with Arduino, and I have a question about a chip I'm using, the MPU9150, a 9-axis accelerometer+gyroscope+magnetometer. I wanted to know if its registers are wiped when the power ...
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2answers
439 views

Generating exact frequency of vibration with motors

I measured the frequency of motors with an accelerometer (ADXL335), but the frequency from my measurement is a lot different from the frequency specified in the product page. I tested with two ...
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2answers
188 views

Help building acceleration detection device/circuit for my bike

I want to build a device using an accelerometer. Press a button after a bike ride and have a light turn on if during the journey I managed to attain a certain acceleration. Thinking of using some ...
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2answers
102 views

ADXL345 generating interrupts without MCU

I wonder if it's possible to drive an ADXL345 without an MCU on the board. That is, to set the ADXL345 to generate an interrupt on activity without needed an MCU on board. Could the register values ...
5
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2answers
3k views

Why am I seeing drift when using Madgwick algorithm to correct for orientation with 9 DOF IMU?

I am trying to correctly track orientation of a sensor with accelerometer, gyroscope, and magnometer, using the open source Madgwick algorithm. The algorithm returns quaternions which represent the ...
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0answers
195 views

MPU 6050 dspic33fj128gp802 addition operator problem

I use dspic33fj128gp802 and MPU6050 for my project. Microcontroller succesfully takes the data from sensors 6 channel and sends the data pc via UART. When i want to add "float 2.0" or "int 2" to ...
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1answer
1k views

Balancing quadcopter using mpu6050 [closed]

I am on a project which nearly completed. But what remains is balancing. My project is making a quadcopter. All the programing and hardware stuff is completed. But when i fly it, it doesnt goes up, it ...
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1answer
1k views

IMU for joint angle measurement

I am planning to use IMU for joint angle measurement of hand(shoulder ,elbow and wrist joint), I am confused about reference frames of accelerometer and gyroscope. According to my understanding ...
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1answer
752 views

Bricked IMU using a magnet?

I think I may have bricked my IMU or seriously damaged it earlier this week. I have the Adafruit 9-DOF IMU Breakout - L3GD20H + LSM303 (link: http://www.adafruit.com/products/1714) which has an ...
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1answer
593 views

Does position error from accelerometer still build up quadratically when using Kalman filtering?

I want to implement an inertial navigation system that uses a basic IMU for indoor position tracking. From all the things I've read you need to assist the IMU with something like GPS or other means of ...
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4answers
316 views

Best methods for long term position tracking?

I am in the beginning stages of development for a project where I need to continuously track the position of an object for long amounts of time. The object will not move very much, but when it does I ...
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1answer
74 views

Assessing accelerometer quality

How can I determine the quality of an accelerometer? Is there a standard measure, such as the SNR, or set of measures? What makes one accelerometer better than another; the accuracy of its sampling ...
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1answer
296 views

How would you dampen this little quadcopter?

Well, I made a little quad from scratch. From scratch as in from PCB design. After assembling, testing, some coding, it turns out my accelerometers get WAY TOO MUCH vibrations and I can't detect ...
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1answer
105 views

how to connect the pins of accelerometer MMA7361 [closed]

i have an accelerometer modulw whose pins are 5v,3.3v,x,y,z,sleep,og-detect,g select,selftest. i have connect only 5v,x,y,z please tell me how to use other pins. In my connection it gives random ...
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3answers
813 views

How to get values in terms of G in STM32F3 Discovery board

I am working on STM32 F3 Discovery Board. I am accessing accelerometer of the board. While doing so I am getting values for X,Y and Z axes. But these values are some random numbers. I want the output ...
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3answers
688 views

What is the unit of accelerometer module output

I am on a project to track the human body motion in to a 3d design and animation software. I found that acccelerometers are used for these purposes. According to my project what I will need is the ...
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1answer
82 views

Noisy sensor on a prototyping board

I made a small prototyping board where accelerometer data is read into a microprocessor, showing the data from the accelerometer after it is sampled, gives a very noisy signal. (50 mv peaks) I had a ...
3
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1answer
995 views

How is an accelerometer initially calibrated?

Referring to a MEMS accelerometer, how is the laboratory, initial calibration being carried out? Is the gravitational acceleration involved as a reference, or is the actual analog data being ...
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3answers
1k views

Functionality of Accelerometers

Is it possible to do a speedo meter with an accelerometer ? I am working with Arduino hardware.
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2answers
914 views

How can I convert ADXL335 acceleration data into displacement?

I am using ADXL335 3 axis accelerometer to measure wave elevation on a tank. The data I receive from the sensor is acceleration. I need the displacement of the sensor in x,y and z direction with ...
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1answer
275 views

Interpretation of the graph of accelerometer

I have plotted the raw values of my accelerometer in gnuplot, and the acceleration in the dimensions of x, y and z are as follows... The accelerometer sensor is in a steady position, my question is. ...
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1answer
1k views

how to calibrate ADXL345 accelerometer?

I have ADXL345 digital accelerometer by Analog Devices. I use Beaglebone ADXL345 library that exist here: http://inspire.logicsupply.com/2014/08/beaglebone-3-axis-accelerometer.html So I can read the ...
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1answer
6k views

MPU6050 DMP values read

I am using MPU6050 breakout board IMU along with ATtiny2313 microcontroller to get the accelerometer and gyroscope values from the IMU. Here's the question : I want to know what values are computer ...
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1answer
329 views

accelerometers vs gyroscopes

In terms of semiconductor integrated circuits, is there any difference between an accelerometer or a gyroscope? are they the same part? Can I get a IC recommendation for something with 3 axis?
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1answer
346 views

ADXL 335 Accelerometer incorrect Output. z and y axes always the same

I have an ADXL 335 Accelerometer. I'm checking its output voltage values using a multimeter and I'm consistently getting the z and y axes giving me the same result. How do I trouble shoot this problem?...
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2answers
5k views

Understanding use of accelerometers to measure angular (rotational?) accelerataion

Imagine this: A rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to 90 degrees back-and-forth (in the xy plane), so does the rod. My goal is to measure the instantaneous ...
2
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2answers
4k views

Reading MPU-6050 with MSP430g2553 using I2C

I´ve been searching for libraries or documentations for helping me reading from and writing to the acell + gyro breakout MPU-6050 from InvenSense. I managed to read it with the arduino's libraries ...
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4answers
291 views

Using change in magnitude of accelerometer to calculate speed?

I have a wheel (say 60cm in diameter). And I am planning to attach a small board with an AVR and an accelerometer about 10-20cm from the centre. As the wheel spins, I will get acceleration outwards. ...
4
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2answers
2k views

Is one accelerometer enough for detecting tilt/orientation of a rigid body?

I posted this question earlier in physics.stackexchange, but I think this is actually the best place for it. I’m not familiar with sensor hardware, and I don’t really know how an accelerometer works. ...
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1answer
1k views

Problem in reading accelerometer axis (ATMEGA328P + ADXL345)

I really need help with my project. I'm trying to connect ADXL345 with ATMEGA328P through SPI interface to send received data from Atmega328P to PC via UART interface. The ATMEGA328P is sending the ...
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1answer
2k views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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1answer
11k views

Understanding how to use an accelerometer to detect vehicle collisions

Objective: To use an accelerometer to detect where on a vehicle a crash occurred (e.g. impact occurred on the passenger side.). Parts: Arduino Uno and LSM3030DLHC accelerometer Background: I've been ...