Questions tagged [accelerometer]

A sensor to measure acceleration.

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1answer
834 views

Accelerometer SA0 & SA1 Pin hanging

I'm trying to TWI communication between accelerometer FXOS8700 & micro-controller (nrf51) but I forgot to connect SA0 & SA1 line to micro-controller pin (or connection to GND) & all PCB ...
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2answers
2k 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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1answer
2k 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
4k 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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3answers
2k views

In theory, is the position derived from accelerometer absolute?

I recently found multiple research papers that say that in theory double integral of accelerometer data gives a position of the device. Does that refer to absolute position (like the one given by a ...
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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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1answer
469 views

Calculate battery consumption in IoT Device, Parameters and Considerations Regarding Bluetooth

I've designed a basic IoT architecture to measure biosignals. I am not an expert in the field so I have doubts in basic battery consumption calculation and considerations. The proposed system ...
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1answer
467 views

Speed detection using ADXL335

Can i find the speed of the vehicle using ADXL335?. My idea is to send an email alert if the vehicle speed exceeds the defined limit using raspberry pi. Just like in zoomcar or the other rental cars.
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2answers
665 views

Smoothing Accelerometer/Gyroscope Displacement Tracking for Mouse Motion

I'm working on a project to combine a linear acceleration reading from an accelerometer and gyroscope, adjusted for gravity, into displacement/position on an x-y plane, specifically for turning the ...
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1answer
204 views

Using 3-Axis Digital Accelerometer to Measure Rotational Acceleration in a Helmet?

I'm very new to using sensor components and I have a 3-axis digital accelerometer I can use, but I don't know if I can use one to measure rotational acceleration in a football helmet? Is the sensor ...
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1answer
1k 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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0answers
478 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
250 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
79 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
1k 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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655 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
134 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
72 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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1answer
578 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
726 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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3answers
4k 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
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 ...
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1answer
374 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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1answer
90 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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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 ...
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2answers
143 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
170 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
139 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 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 ...
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1answer
1k 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
4k 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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2answers
177 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
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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2answers
636 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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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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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 ...
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0answers
157 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
1k 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
257 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
231 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
330 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
895 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
386 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
470 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
507 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
203 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
830 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
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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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 ...

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