Questions tagged [accelerometer]

A sensor to measure acceleration.

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1answer
856 views

ADXL 335, lack of resolution for short angle inclination?

I am currently working on a project where I would like to measure X/Y inclinations changes, without worrying too much about the acceleration. I decided to use ADXL335 accelerometers in order to ...
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1answer
4k views

Measuring speed with 3axis accelerometer

We are creating a ball that changes colour depending on its speed when it rolls. I have a 3 axis accelerometer sensor. This is the code we are using at the moment: ...
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1answer
10k views

AHRS algorithm under continuous linear accelerations

I have tried several algorithms to get pitch, roll and yaw under continuous linear accelerations and vibrations (smaller than 0.4g, frequency lower than 10HZ). None of them give good results because ...
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4answers
16k views

Dead reckoning with accelerometer & gyro. Possible?

I have a 3 axis accelerometer and a 3 axis gyroscope. I've been tasked with developing a dead reckoning system using this hardware. Essentially what's needed is for me to develop some code to track ...
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1answer
154 views

Accelerometer acquisition, filtering and treatment on Pic

I've been asked to experiment with dynamic testing. Using accelerometer and strain gage bolted onto a metallic pipe,and hammering it ( the pipe ) I need to show out force of the impact, and ...
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2answers
2k views

MEMS Gyroscope BMI055 - random high spikes in data

I am using the BMI055 on my AVR through I2C. Datasheet: http://ae-bst.resource.bosch.com/media/products/dokumente/bmi055/BST-BMI055-DS000-06.pdf I set it to filtered output at an ODR of 1000Hz and ...
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2answers
1k views

Reducing jitter and improving speed of accelerometer output

I'm not sure if this is an EE question or a StackExchange question due to the programming involved, but anyway here goes: I just built a tilt sensor for my tractor's front loader. I wanted something ...
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2answers
624 views

Accelerometer Bosch BMI055 returns 8 bit overflowed values?

I try to use a BMI055 Acclerometer and the output is driving me crazy. I have set it to 2G sensitivity at 1000Hz, that means I have an output between 0 and 4096 (12bit). The output is said to be ...
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1answer
2k views

Accelerometer raw data output to measure vibration,and do a frequency spectrum/ amplitude spectrum?

Ive used an Arduino to measure vibration on a washing machine and have up to 100 raw data out putvalues. I want to present an amplitude/frequency spectrum with these values, i have matlab and simulink ...
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1answer
2k views

GY-521 Unable to set PWR_MGMT_1 register - can't disable SLEEP mode

I am attempting to interface between a custom 8051-based MCU and a new (ebay) GY-521 module (Gyro/Accel chip) using I2C bus. I have written the I2C bit-bang functions myself and they seem to be ...
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2answers
618 views

Simulating accelerometer noise

I would like to create a software simulation of an accelerometer (MPU-6000). As part of that simulation, I need to model the noise on the accelerometer signal. According to the datasheet of the chip, ...
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1answer
631 views

Prototyping for Bluetooth accelerometer

I'm a software developer looking to prototype an application that requires input from a 3-axis accelerometer, ideally via Bluetooth LE. Current specs on the accelerometer are +/-50G sensing range ...
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1answer
281 views

2's complement only works in one direction with the LSM303DLHC

In java I have the code ...
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2answers
3k views

Arduino UNO and ADXL345 getting 0 0 0 OR -1 -1 -1 outputs with SPI communication

I have EVAL-ADXL345Z evaluation board from Analog Device hooked up to the Arduino UNO R3, the code complies and runs fine. At first I could still get the output values, but after sometime the output ...
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3answers
15k views

Track 3D Position with an Accelerometer [closed]

I'm trying to build a piece of hardware with an accelerometer that could track the approximate 3D position of an object. The accelerometer would not be rotating, so a gyroscope shouldn't need to be ...
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1answer
5k views

Tracking 2D positioning with IMU Sensor

I am using a miniature car and I want to estimate the position. We can not use GPS modules and most of the tracking systems that I saw, are using IMU senson with the GPS module. In our car we are able ...
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2answers
723 views

Am I forced to use a gyro and an accelerometer, to find a relative point in space?

I am quite new into the electronic realm, so forgive my lack of proper terminology. I am planning to build a simple device, that I will be use to manipulate a mesh on my computer. when I move the ...
4
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1answer
2k views

Can a 3-axis magnetometer be tilt compensated when moving/accelerating?

I have a magnetometer, accelerometer and gyro which all go swimming (attached to a person.) Data is logged and I now have a sample of that data. I want to calculate the magnetic heading the user was ...
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2answers
674 views

accelerometer accuracy determination

I was looking in to some accelerometer and wondering how I could determine the smallest acceleration change, certain sensors are able to detect. if I wanted to calculated this for example for this ...
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1answer
2k views

Undestanding LIS3DSH datasheet and AN339 Application Note - Intepreting accelerometer data

I am reading LIS3DSH accelerometer datasheet and I have some questions regarding following text: 2.2 Understanding acceleration data The measured acceleration data are sent to OUT_X_H, ...
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1answer
856 views

Accelerometer readings, what is wrong?

I made a board with the Analog Devices ADXL345. I then attached it to my robot and did obstacle avoidance with data logging for about 10s. The robot made 4 turns. Here is a graph of z-axis readings. I ...
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1answer
2k views

Kalman filter on linear acceleration for distance

In my application to calculate displacement from motion of accelerometer, I am using kalman filter to improve the displacement accuracy. Please note I am aware of ineffectiveness of acceleration for ...
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0answers
802 views

LIS302DL Accelerometer WHO_AM_I command

I've setup the behaviour of LIS302DL accelerometer IC using following code: ...
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1answer
785 views

Accelerometer IC single/double click event

What are Accelerometer single and double click event, can someone clarify it for me with some theory and/or practice?
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4answers
3k views

Fall Detection using Accelerometer

I am now developing a micro-controller based system that detects when a person falls down using Accelerometer. The accelerometer might be placed in the person's cloth pockets. The important thing is ...
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1answer
722 views

MPU6050 connection

Here is what I have done... I simply copied the simple Arduino MPU6050 code from http://playground.arduino.cc/Main/MPU-6050 and pasted it in my arduino uno R3, which is interfaced with GY-521 IMU.... ...
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2answers
2k views

Measure RPM with a discrete component?

I have a problem that I need to measure an RPM of a rotating axle with a single element (circuit) attached to it - i.e. I can't use a hall effect sensor, because I can't use a separate magnet - I can ...
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1answer
144 views

Accelerometer selection? [closed]

I would like to design a circuit which when moves should give out a voltage. So I would like to choose an accelerometer for this application. I wish to go for single-axis accelerometer which is quite ...
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2answers
231 views

Tracking movement of limbs for smartphone app

I'm looking at building a smartphone app that will need to track the users limbs (say legs/feet) as accurately as possible. The goal is to trace the moments of body parts and the timing of the ...
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1answer
4k views

How do you use an accelerometer as a speedometer in a car?

I was given a task to put a accelerometer inside this block diagram. I've done tons of research but still couldn't find any way. Ignore those chinese words. The left and the right is the motor of the ...
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4answers
2k views

What sensor to use for sensing azimuth & altitude of satellite dish?

Instead of using a motor encoder, what electronics sensor I could use to know the position of a satellite dish? In this case will be the Azimuth and Altitude of the dish (2-axis). Magnetometer, ...
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2answers
3k views

Temperature compensation of LSM303DLHC accelerometer / magnetometer

ST Microelectronics makes the LSM303XXXX, a popular range of 3-axis accelerometer / magnetometer sensors that are used on Arduino breakout boards, etc. The older LSM303DLH sensor has been replaced ...
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2answers
1k views

Building small, low-power pedometer/odometer with memory and time/date log

Background I'm a researcher looking at the use of personal tracking devices and apps (like Strava app or Fitbit device) for cycling. At the moment I'm designing a simple experiment where I want to ...
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1answer
471 views

Accelerometer and/or Gyroscope for gesture sensing

I want to sense 3D motion (gesture). I have 3 axis accelerometer. But I am confused if I need a gyroscope or not for orientation and rotation sensing. Isn't it possible to measure them from ...
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3answers
11k views

Is it possible to measure constant velocity using accelerometer/Gyro

I have a board that has a gyro and a 3-axis mems accelerometer. Is it possible to measure constant velocity using accelerometer/Gyro. I find velocity by integrating (summing) acceleration over time. ...
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2answers
1k views

Choosing an accelerometer for collisions

I currently have an ADXL345 accelerometer. For a project, I need to be able to detect if my device has a heavy collision with a wall / hard surface. I need to trigger other events on a big collision. ...
3
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2answers
574 views

Gyroscope questions: building a stable platform

I'm embarking on a summer project and have a few questions. I'm planning to build a 3-axis stable platform for electronics. (Picture a flat surface that stays parallel with respect to the ground while ...
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3answers
2k views

LSM303DLHC low-power and high precision modes

The LSM303DLHC is a 3-axis accelerometer + 3-axis magnetometer chip from ST. The datasheet is a bit light on details however. I'm trying to work out what is different about the low-power mode and how ...
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2answers
2k views

Problems while using accelerometer as a motion switch

I am using an accelerometer ADXL206 and a microcontroller PIC16F917 to determine the relative linear motion of a device that functions according to this motion. I can read data from the accelerometer:...
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1answer
1k views

How to get translation and roation data using 6DOF MPU6150

I am trying to get the position data from an IMU 6 Degrees of Freedom (MPU-6150) board using an Arduino Uno. I am trying Jeff Rowberg’s example MPU6050_DMP6.ino that may be found here. This is the ...
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3answers
3k views

How to decrease the sensitivity of a sensor (accelerometer) [closed]

The accelerometer in this kit are very sensitive. Even a small touch changes the values very rapidly. I want to lower the sensitivity of the sensor. What is the way of doing this?
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4answers
2k views

Converting two's complement hex values to binary?

I'm reading x-axis accelerometer data from an IC via the I2C bus using I2C-Tools ( specifically i2cget ) in Linux. Here is the code that is reading these values: <...
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1answer
872 views

How can I lower output impedance of an accelerometer?

I'm planning to use an accelerometer with a microcontroller to measure acceleration. The issue that I have ran across is that in PIC microncontrollers the ADC requires that the connected analog ...
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1answer
857 views

Angle errors in IMU (using Accl & Gyro)

I am making Autonomous Quad. I am programming my IMU using ADXL335 -3 Axis analog Accelerometer & L3G4200D 3-axis digital Gyro. I am using ARM Cortex M4F based TI's stellaris launchpad LM4F120XL. ...
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1answer
840 views

accelerometer for linear displacement

I have accelerometer readings from the android device. I would like to know what kind of acceleration this data represents(rotation or linear acceleration). Is there anyway I can use this data to ...
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1answer
17k views

Wiring a GY-521 to an Arduino Uno R3?

I am searching for a non-technical picture or diagram or explicit textual instructions explaining how to wire a GY-521 Accelerometer/Gyro to an Arduino Uno R3. I am a software developer and need ...
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1answer
413 views

Problem stacking accelerometer and SD card shields on Arduino UNO

I have an ADXL345 accelerometer on a Makershield stacked on top of a Seeed SD card shield. Both of those are stacked on an Arduino UNO R2. I've got each working individually, but when stacked they ...
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2answers
4k views

low pass filter design for accelerometer

I find the following code for a simple implementation of a low pass filter. #define alpha 0.1 accelX = (acceleration.x * alpha) + (accelX * (1.0 - alpha)); I have been experimenting with the value ...
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1answer
317 views

how to wire up LIS302DLH with arduino? (or similar, small accelerometer)

heads up: I'm new to electronics and have just started working with the arduino. I'm trying to hook up a LIS302DLH accelerometer (spec sheet) with the arduino. I'...
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2answers
1k views

Does MEMS accelerometer stability deteriorate over time?

I am wondering if over time MEMS accelerometer produces any worse output than when it is new? I found this research paper which acknowledges that temperature affect sensor output but there are no ...