Questions tagged [accelerometer]

A sensor to measure acceleration.

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What is the difference between IMUs and other devices that have accelerometers and gyroscopes (smartphones, tablets, sensewear etc.)?

The general definition of IMU says that any device that has accelerometer, gyroscope and magnetometer/GPS packed together is an IMU. Then why aren't other devices that have the same sensors called ...
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1answer
517 views

Configuring IMU FIS1100

We have been working on motion sensor unit FIS1100. We decided to use it as traditional motion sensor (FIS1100 can be operated in two modes Attitude engine mode and traditional sensor mode). We are ...
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1answer
1k views

Need 3-axis wireless gyroscope/accelerometer.

So I would like to have a sensor that can detect rotation (around the vertical axis only is needed) and that detects motion (no specific direction, only be able to detect if the sensor is moving). I ...
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2answers
673 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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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. ...
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1answer
79 views

Adafruit Feather (Arduino compatible) nRF52 SPI with ADXL345 issues

I’m experiencing some issue in trying to make ADXL345 accelerometer works in SPI by using an nRF52 feather. I'm using the ADXL345 SparkFun library read values from it. Here are the connections ...
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2answers
404 views

STM32F722ZE SPI communication with LSM6DS33 using HAL

For a long time I can not read the correct data from the LSM6DS33 control register (accelerometer + gyroscope). As I read in the datasheet, the control register address WHO_I_AM is 0x0f. In order to ...
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1answer
347 views

How to speed up charging of output capacitors of ADXL335?

Problem statement I need to obtain as fast as possible after power-up a reading from an accelerometer. The accelerometer is located in a car and is powered by the same rail of the rear braking lights,...
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1answer
3k views

How to calculate the orientation of a IMU sensor?

With a BLE CPro sensor I'm trying to "build" a remote control for a smartphone game. How can I recognise the orientation (pref. grads) of the sensor if it is on the left or right without being ...
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1answer
914 views

Data Problem with Multiple MPU6050 and Arduino Nano

I've been working on a recent project which involves multiple IMU's(Specifically 5 MPU6050's, GY-521 Breakout board). Everything works fine, from angle calculation to dealing with gyroscopic drift for ...
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1answer
89 views

Hardware based magnitude for accelerometer

In the past I've taken the magnitude of an accelerometer digitally, using the following equation: magnitude = sqrt(x^2 + y^2 + z^2) However, in order to do this ...
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2answers
320 views

Measuring the velocity/acceleration of a swinging pendulum

I'm trying to find a good way for measuring the speed/acceleration of a swinging pendulum. I know one way is to use an optical encoder for capturing the rotation positions, but unfortunately there's ...
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3answers
586 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
190 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
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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2answers
674 views

Adding High Byte and Low Byte of LSM303DLHC Accelerometer Output

Interpreting LSM303DLHC Accelerometer Output Hi all, This is my first StackExchange question ever, so I will do my best to be specific and offer as much reference as possible. I'm currently ...
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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
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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1answer
2k views

Vibration Measurement using Accelerometer ADXL335

I like to know how to measure vibration in Hz using ADXL335/similar sensor in one axis, With that sensor, after converting digital using ADC, now i have some 8-bit binary value(0-256 in decimal)... ...
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1answer
227 views

PIC16F1783 Inclinometer Project using Accelerometer 12-bit ADC issue

I am working on an inclinometer project using an accelerometer, MMA1220KEG and a PIC16F1783, it is designed to switch a relay when the angle of inclination is below 15 degrees and illuminates a series ...
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0answers
800 views

LIS302DL Accelerometer WHO_AM_I command

I've setup the behaviour of LIS302DL accelerometer IC using following code: ...
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2answers
3k views

IMU (gyro + accelerometer) breakout board with integrated Kalman filtering?

I am in need of a reliable gyro/accelerometer combo, that already has built-in motion processing (don't want to deal with Kalman filters in software). It seems that there are breakout boards out there ...
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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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4answers
274 views

Which is give better result for find angular position of device using 9-axis IMU snesor.?

I'm Using LSM9DSO 9 axis Sensor Which gives output of Accelerometer , gyroscope , Magnetometer Output data. i want to find the angular position of the device using this sensor. currently i'm trying ...
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2answers
187 views

What is the meaning of output of an accelerometer

I know this question is not fully related to aviation, but I assume the people on this subsection will also have some idea. Suppose I have an accelerometer resting on a table(flat surface, horizontal)...
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5answers
1k views

Is it possible to get accelerometer magnitude value lesser than 1G?

I'm using lsm9ds1 accelerometer. I retrieved row data in mg for Y, Y, Z accelerometer axes every 10 ms and calculated the magnitude sqrt(x^2 + y^2 + z^2) but this ...
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1answer
232 views

Using an External interrupt from any pin PIC16F873A

I'm trying to use an interrupt, which will occur on a rising edge of a signal coming from my LSM303DLHC accelerometer. The accelerometer has a Data Ready (DRDY) signal that fires every time new data ...
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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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3answers
3k views

Cheap accelerometer in DIP package?

I've been looking around to see if there's a relatively cheap (around £5) accelerometer / tilt sensor in a DIP package for prototyping. Breakout boards exist for the ADXL335 but seem to be ...
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4answers
294 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. ...
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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
40 views

How is Gyro drift error related to error in velocity and position?

While reading about IMU on wikipedia I found this about its disadvantages: "A constant error in attitude rate (gyro) results in a quadratic error in velocity and a cubic error growth in position." ...
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2answers
616 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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3answers
159 views

How to detect the Accelerometer is moving

I am using the MCU intergrade 3-axis accelerometer and set it on the bicycle. I want to detect the bicycle is moving or stop. But the vibration noise let my function failed. Is anyone could share ...
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2answers
1k views

Does multiple IMU increase accuracy

I'm just starting up with IMU's and I really want to work on my own flight controller, but a question always hits my mind and I am not able to find answer anywhere, so I'm here. Will multiple IMUs ...
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2answers
725 views

Bosch BNO055 gyroscope bias stability

What is the bias stability in degrees/hour of the gyroscope on the BNO055? The datasheet lists some specs of the gyro on page #14 but I cant find the bias there. There is an item called "output noise"...
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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
720 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 ...
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2answers
18 views

MMA8452Q INT1/2 drive circuitry

I'm struggling to find any information on how the interrupt outputs on the MMA8452Q accelerometer are driven. I need to know whether they're open-drain or push-pull for example. I've poured through ...
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2answers
92 views

Unexpected results when measuring MPU6050 sample rate with RaspberryPi

MPU6050 datasheet says that maximum accelerometer data output is 1Khz, so in theory when measuring time it takes to receive 1000 data samples through I2C, so I should receive all data in no less than ...
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1answer
247 views

How to reliably sample a sensor during the rotation of a wheel in a car?

I would like to sample the acceleration of the wheel axis (vertically and left-right) N times per rotation (for example once per spoke, but not necessarily). The data would be processed with Arduino. ...
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1answer
3k views

What's the best method of measuring displacement and speed without resorting to GPS?

Is it possible to determine the displacement, speed and acceleration of someone while running, by using methods like dead reckoning, sensor fusion or other, and sensors like accelerometers, ...
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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

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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3answers
777 views

arduino logging acceleration data

I had a general question about logging accelerometer data on the Arduino or any microcontroller. I had a KXPS5-3157 accelerometer hooked up analog mode to measure z-axis vertical acceleration in a ...
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2answers
141 views

Track movements of 500 objects in one single room [closed]

Let's say we have a room with a size of approximately 300 sqm. In this room we have 500 objects that are tagged with beacons having accelerometers. Is there any way to process the produced data of ...
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2answers
138 views

Making accelerometer sense nonconventional gravity

I am working on a project of finding the bevel angle of a worm drive blade. To find the angle, I have decided to use 2 accelerometers. One of it being my reference and will sit on the footplate, the ...
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1answer
119 views

Latching battery switch triggered by interrupts

I've got an accelerometer with a couple interrupt pins and I've figured out how to get it to fire its interrupts on any change in acceleration or lack thereof for a given duration. What I want to do ...
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1answer
494 views

converting g changes to angular velocity

I am trying to get angular velocity from accelerometer. I can get G values and degrees of object on 3d space. Can I convert g values somehow to angular velocity? I was thinking taking ...
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1answer
502 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 ...