Questions tagged [accelerometer]

A sensor to measure acceleration.

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0answers
429 views

Should I be using a Standard Kalman Filter (KF) or an Extended Kalman Filter (EKF)?

So I am trying to implement a Kalman filter for an Inertial Measurement Unit (IMU) using an Arduino. I have 4 sensors: GPS Accelerometer Gyroscope Magnetometer To measure various vehicle properties ...
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1answer
240 views

IC identification

I think it is an accelerometer. It has connections to STM32F303 analog pins. Can you suggest the part model?
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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
72 views

Raspberry multiple accelerometers please help with schematic

I am new to electronics, and I have been playing around with Raspberry Pi 3 and an ADXL accelerometer. So far, I have managed to draw data in I2C from the accelerometer. However, now I am trying to ...
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1answer
833 views

Op amp signal processing of an accelerometer output for an ADC

I have been designing a board which will monitor vibration activity of a machine using MEMS accelerometers. So far, I have connected the unadulterated signal from the accelerometer to the ADC however, ...
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3answers
2k views

Removing noise from accelerometer data

I am new to signal analysis and I need to remove noise from an accelerometer recording. 2 accelerometers are mounted a machine and recorded vibrations at 500 Hz. The aim is use vibrations to ...
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1answer
342 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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610 views

Constant values read from LIS3DSH Accelerometer

I'm working with the board STM32F4DISCOVERY from ST microcontrollers. I'm trying to read acceleration on the 3 axes from the accelerometer LIS3DSH via I2C communication. The code is working on one ...
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2answers
124 views

Why do accelerometers have holes etched in their masses?

I have been studying MEMS for a while now and I noticed that in almost every accelerometer design there are holes etched in the mass that is attached to the hinge. Why is that? A thing I thought of ...
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1answer
70 views

can I get noise of 24G with accelerometer configured at +-16G

I'm using lsm9ds1 accelerometer configued to +-16G. by reading raw data, I've got a value of 24G which I think it's a noise. I didn't configure any filter on the accelerometer. can a noise reach 24G ...
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4answers
272 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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1answer
631 views

Measure vertical distance travelled

I wonder if it's usually practical to use an accelerometer to measure the height of a ball tossed in the air. That is, would it be accurate to integrate the acceleration measured over time twice? An ...
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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
538 views

Weird problem with ADXL345, Buzzer and Arduino

I've set up a Serial port via a Bluetooth module (HC05). I'm using a JavaFX app that I wrote to read the serial port, plot the acceleration values (via ADXL345) and write back to the serial port an ...
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1answer
661 views

Calculating pitch and roll from gyro data

Does anyone know if it's possible to calculate pitch and roll angles from gyro data (without an accelerometer)? I'm trying to use a L3GD20 to measure pitch and roll. I can read the angular rates, but ...
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1answer
360 views

IMU - How to calculate the orientation in a shaken environment

I'm trying to calculate the orientation on an IMU Sensor. Until now I'm doing it by calculating the Pitch angle and it's working fine: ...
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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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3answers
147 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 ...
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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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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....
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1answer
884 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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2answers
162 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 ...
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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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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 ...
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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). ...
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1answer
915 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 ...
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0answers
251 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 ...
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0answers
222 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 ...
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1answer
318 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 ...
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1answer
836 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 ...
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2answers
348 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 ...
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1answer
455 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. ...
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1answer
183 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 ...
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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 ...
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5answers
397 views

accelerometer interference

I had a PCB containing a micro usb and a 3 axes accelerometer LIS3DH. I put the PCB at fixed position and the value of Z vary between --77at -83. but when I touch the usb cable with my hand or with a ...
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2answers
712 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
314 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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1answer
367 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 ...
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3answers
3k views

MPU-6050 angle readings under mechanical vibrations

I'm in process of making a quadcopter. At this point I encountered a problem with MPU-6050 angle calculation. When quadcopter is stationary with motors in off state and I'm tilting it, angle readings ...
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1answer
785 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 ...
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1answer
152 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 ...
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1answer
335 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 ...
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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. ...
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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
241 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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2answers
60 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 ...
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1answer
460 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 ...
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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 ...
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1answer
151 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 ...
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1answer
109 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'...