Questions tagged [accelerometer]

A sensor to measure acceleration.

Filter by
Sorted by
Tagged with
10
votes
1answer
1k views

Recovering data from a saturated accelerometer

I have an ADXL345 accelerometer and mounted it to a hybrid rocket to launch. Unfortunately, I forgot to set the range from its default of +/-2g to +/-8g (we expected 6g during liftoff). For +/-2g ...
1
vote
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 ...
0
votes
3answers
150 views

Detect if object is lying on the surface or is it lifted into the air?

Suppose we have a small box with a circutry and a set of sensors in it. Box is lying on the table, but it is light enough to be lifted into the air. What I want to achieve is to switch off the ...
1
vote
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 ...
6
votes
2answers
3k views

How can I detect angular movements and disregard lateral movements?

I'm working on a project that involves a flat platform that a user can tilt from side to side and forward and back. I'd like a sensor that can monitor the angle difference between the platform's ...
2
votes
1answer
929 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 ...
0
votes
2answers
3k views

How to compute acceleration from accelerometer raw data

I'm working on a project based on NXP accelerometer MMA8653. This is a I2C, 3-axial accelerometer with 10-bit resolution. Actually I can read the accelerometer registers and I'm able to configure it....
0
votes
2answers
165 views

acceleration output interpretation

I'm using LSM9DS1 accelerometer which I configured with 16g range. I left the device without movement and I got following accelerations x : 0 y : 0 z : 1300 the device is subjected only to ...
1
vote
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, ...
2
votes
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 ...
14
votes
7answers
2k views

Measuring small movements of a needle and syringe

My question is how to measure very small movements of a needle and syringe when injecting. When doctors inject local anaesthetic, they always aspirate (suck back) first to make sure they are not in a ...
5
votes
4answers
10k views

Determine the angle and speed of a rotating platform

I have a 1 axis (x) spinning platform, that is spinning pretty fast ~300 RPM. I want to be able to detect with a good degree of precision how many degrees it has travailed from its starting position ...
1
vote
0answers
155 views

Velocity from Acceleration [closed]

In geological instrumentation, it is frequent to find the "integration of the acceleration" measurement, as the "empirical estimate" of the velocity, namely, the Particle Point Velocity (PPV). ...
1
vote
1answer
944 views

How do I configure the LIS3DH as a pedometer that generates interrupts when walking?

I found a lot of algorithms for pedometers that assume a fast CPU with a decent ALU and high sampling rates, which I don't have. (Z80) However, the LIS3DH has various options for generating interrupts ...
1
vote
0answers
252 views

3.3v output voltage on arduino mini

I'm learning to use the Adafruit LSM9DS0 and have cobbled this code together such that an LED will turn on when it detects motion on the accelerometer, specifically when the magnitude is over a ...
1
vote
0answers
224 views

Accelerometer - Offset correction

I'm using the MMA8453Q for motion detection. The accelerometer is mounted such a way that when it is stationary, X & Y axes are at 0g & Z-axis is at 1g. My usecase is: A tilt across any axes ...
1
vote
1answer
320 views

Accelerometer - Tilt Detection

I'm using the MMA8453Q for tilt detection of 45 degree in any axis. I'm a newbie to embedded devices. I have a few questions. 1) Should I be using Transient detection or Motion detection for my use ...
0
votes
1answer
851 views

Accelerometer gives wrong values for stationary axes

I have a BMI160 IMU which gives a good reading for the axis parallel to gravity (1G or -1G), but a changing value of about 2G or -2G for the axes that should show 0G. This is true for all axes, I've ...
0
votes
2answers
356 views

What are the technical difficulties of making an accurate digital accelerometer?

In theory, double integrating accelerometer data with time should give displacement. However this is not widely practiced due to how susceptible accelerometer is to noise (and other reasons??), and ...
0
votes
1answer
458 views

Quadcopter balance with MPU-6050

It is not uncommon to see people asking about how to balance a quadricopter using MPU-6050. It's also common to see people answering that a PID controller is needed. However, people doesn't say how. ...
1
vote
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 ...
2
votes
1answer
186 views

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 ...
1
vote
1answer
785 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 ...
1
vote
1answer
1k views

ADXL345 GY-291 weird measures

currently I am trying to connect several ADXL345 to an Arduino Nano. I followed the Sparkfun Tutorial on how to do this (https://www.sparkfun.com/tutorials/240). Long story short, I connected two ...
11
votes
4answers
5k views

Limits of dead reckoning using MEMS sensors

I'm trying to track body parts relative to a person's torso. I see quite a few questions about using MEMS accelerometers and gyros for dead reckoning, and they confirm my suspicions that various ...
2
votes
2answers
322 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 ...
0
votes
1answer
382 views

Is it possible for the Kalman gain to become 1 or 0 [closed]

Is it possible for the Kalman gain to ever become exactly 0 or 1? Because as far as I understand, if that would happen (no matter if it were 0 or 1) the Kalman gain would stay 0 in all the following ...
1
vote
1answer
1k views

Measuring vehicle's forward and lateral acceleration using a smartphone

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
10
votes
2answers
57k views

How to read a gyro/accelerometer

I recently purchased this MPU6050 GY-521 breakout board. I tried it with my Arduino Mega using this Arduino sketch provided by official arduino.cc. (MPU-6050 Datasheet, InvenSence (producer) Page) ...
1
vote
1answer
792 views

Calculating absolute roll/pitch/yaw angle of falling objects [duplicate]

I am wanting to build a device with gyro, accellero, gauss (compass) sensors and barometric sensor. This device will record all data from the sensors over a period of about 15 minutes where a person ...
0
votes
1answer
155 views

What's the accuracy of the data sampling clock of LSM303D?

I have a bad case of "please, read the datasheet for me". There is a way to auto trigger the sampling in the LSM303D accelerometer, with a fifo to collect the samples afterwards, and a choice of ...
0
votes
1answer
344 views

How to use an 2-axis accelerometer as a potentiometer? [closed]

I've got a couple of Memsic 2125 accelerometers around and wanted to try to use one of them to replace a pair of potentiometers in a circuit (x axis replaces pot A, y axis replaces pot B). How would ...
1
vote
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. ...
0
votes
2answers
61 views

Combination of acceleration signals

have xA, yA, and zA acceleration signals collected from a smartphone and I call it: set A and I also have xB, yB, and zB same acceleration signals from smartwatch: let's call this set B. I need to ...
3
votes
1answer
470 views

Unwrapping measurements from Adxl345 accelerometer

I am trying to read acceleration values from a ADXL345 via I2C. I've successfully configured the accelerometer with a resolution of 16G. Test 1: 180° rotation along the y axis in 16G resolution. The ...
8
votes
10answers
7k views

Do accelerometers know when they are moving straight up or straight down?

I need a sensor that I can only place on top of an object, to count the number of times the object moves up and down. Would placing an accelerometer on top of the object accomplish this or can it ...
47
votes
1answer
67k views

What are the differences between a gyroscope, accelerometer and magnetometer?

What is the difference between a 3-axis gyroscope, 3-axis accelerometer and 3-axis magnetometer? How do these sensors work? Why are all 3 used in some devices like smartphones, tablets, quadcopters ...
3
votes
2answers
2k views

Detecting foot steps

I'm building an interactive disco dance floor. Like the light up dance floors from the 70's, but each floor panel should be able to detect when it's being stepped on and possibly light up to show this....
9
votes
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 ...
0
votes
1answer
206 views

How to power ADXL362 with consumption as low as possible

I'm designing a product which requires total consumption as low as possible. I came across adxl362 with ultra-low power consumption. However, I didn't figure out how to power it efficiently. There ...
-2
votes
1answer
154 views

Miniture bluetooth enabled accelerometer with API or SDK [closed]

I'm getting into electronics as a hobby. For my first hobby project I want to build something like a super simple fitbit. To achieve this I need a bluetooth enabled accelerometer. I've had a look at ...
0
votes
1answer
111 views

Convert low voltage accelerometer to Wake ATTiny Open Source Binary Watch, activate on wrist motion

I'm working on building a binary watch similar to njeer's binary watch featured on hackaday I am planning on using a cr2032 3.0V 190mAh battery. So in order for this to run for any length of time I'...
1
vote
1answer
1k views

MPU 6050 Digital Motion Processor Gyro Units

I'm running into an odd issue with a motion control processor (MPU 6050 / 9150) that is returning raw gyroscope values as specified between the -/+ 32768 which in the way this gyro is configured ...
-1
votes
1answer
98 views

What means linear response for accelerometers?

What means that accelerometers measures linear acceleration and, in particular, that they are a linear response?
1
vote
1answer
511 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, ...
-2
votes
2answers
189 views

Filters and Accelerometers

I have just started working with the accelerometers and have referred few docs related to same. So I came across the filters used in accelerometers. I need to know, Why are there filters in the ...
0
votes
1answer
699 views

Writing large volume of data to SD card

I'm planning to make a data logger project with 3-axis sensor and SD card. I would like to store 3200 samples per every second on SD card. Currently I could able to store only 630 samples per second. ...
1
vote
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 ...
0
votes
1answer
432 views

i2c communication with pic 18f452

I am new to pic coding. I am trying to turn motor according to change of accelerometer in x direction. I am using Pic18f452 and adxl345. But I couldnt figure it out how to communicate with adxl345 ...
1
vote
1answer
498 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 ...