Questions tagged [accelerometer]

A sensor to measure acceleration.

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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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2answers
4k views

Accelerometer double integration error

I wanted to use an accelerometer or IMU to measure speed and displacement over a period of about 1 minute or 400m. From this answer I found at stackoverflow, the error propagates at a rate of \$t^2\$ (...
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1answer
1k views

ADXL345 Arduino UNO data_ready interrupt

I would like the sensor values to be updated each 10ms(100Hz) and then run the algorithm and repeat the same process. However, after timing the algorithm it is taking only 2ms, I think the data_ready ...
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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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3answers
2k views

Accelerometer Impact/Shock

I am a complete novice when it comes to electrical engineering; however, I'm interested to know the capability of accelerometers. In addition to capturing data on distance traveled, etc. - is an ...
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1answer
272 views

ADXL 345 Noise Issue for my use case

I am building a solution where I want my MCU to wake up based on a trigger generated by accelerometer after detecting an activity. There are a number of samples available for this and I am able to ...
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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 ...
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2answers
661 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
777 views

Temperature sensor slope explanation

I am looking at an accelerometer(data sheet is BMA280 ) which has capabilities of measuring temperature from -40 to 85 degrees celsius. It also specifies a Temperature Sensor Slope of 0.5K/LSB, where ...
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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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2answers
1k views

How to determine minimal detectable acceleration on accelerometer?

How can it be determined the minimal detectable acceleration on analog and digital accelerometers? In datasheets I found only specification like sensitivity, noise etc. And how the minimal time for ...
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4answers
212 views

How can I sense if a cane is being held upright or fallen down?

I am trying to make a little wireless-connected gizmo to attach to my grandfather's walking cane. The idea is that when it senses the cane has fallen down, it would alert/call one of us so that we can ...
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1answer
125 views

Wiring three-axis accelerometer

I need to wire the following three-axis axis accelerometer: http://docs-europe.electrocomponents.com/webdocs/127c/0900766b8127c68c.pdf Here when I click on ADXL335, the below link comes with some ...
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2answers
1k views

Using adafruit Flora or Adafruit Trinket + MPU-6050 3-Axis Gyroscope + nRF24L01+ together

I am trying to do a project where I need to transmit data from an object if the object is moved in a particular way. The restriction is that the device has to be as thin and small as possible. I am ...
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2answers
1k views

Normalization of Accelerometer Data

I have two different boards, one from TI and one from ST Microelectronics. Both these boards have one accelerometer of different brand. These two accelerometer sensors have different sensitivity. I ...
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2answers
2k views

How do I find source of vibration from a mechanical source outside of my home?

My problem is vibration from a mechanical source outside of my home. I think I have found the source (machinery at a legal marijuana grow op) and need to prove it to get an injunction at court. I ...
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1answer
623 views

LSM9DS0's Accelerometer not reading correctly

I have a LSM9DS0 Gyroscope/Accelerometer/Magnetometer breakout board. I am using an Arduino Uno which operates on 5V. The LSM9DS0 is communicating to the Uno using I2C through a Logic Level Converter. ...
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2k views

Angular Acceleration: Understanding the differences between Gyroscopes and Accelerometers

I apologize for what is likely an ignorant question, but I am fairly new to electronics and have little confidence. I am working on a personal project where I am using a servo motor to move a rod back ...
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1answer
34k views

Calculating Angles from MPU6050

I've been playing with a GY521 breakout recently with the MPU6050 chip on it, though i've hit a bit of a problem that I can't quite work out I know when I rotated the board I rotated ~90 degrees ...
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1answer
2k views

Choosing sampling rate according to the bandwith reponse in accelerometer datasheet

In an accelerometer's datasheet, the bandwidth response in the x and y axis is 350 Hz. There is another information related to the internal sampling rate (shown below). I don't know how these two ...
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1answer
683 views

Temperature compensation accelerometer and cross axis sensitivity calibration

I'm trying to compensate a 3-axis MEMS accelerometer for temperature. I can access a climate chamber where the device can be rotated in ONE axis. There is another place where I can rotate two axis, ...
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1answer
747 views

Whats the difference between these three breakout boards for the ADXL345 Accelerometer?

I would like to use the ADXL345 in a schematic im working on right now, but as there is no typical/minimal circuit provided within the datasheet i got stuck. I did a bit of research and found three ...
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1answer
590 views

Arduino standalone with 9V battery and accelerometer

I'm using an Arduino Mega for a project involving an accelerometer. Everything works fine when the board is connected via USB. When I use a 9V battery plugged in with the 2.1mm jack, values 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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1answer
89 views

Is accelerometer taking as much power (current) as it needs? [closed]

I want to connect accelerometer to an oscilloscope. I have 3x AA rechargable batteries (2550mAh). I was told that e.g. microcontroller knows how much amps should it take and it wont burn if I ...
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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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1answer
251 views

Is it possible to measure acceleration in sports activities with an accelerometer

I've been trying to make a simple prototype capable of measuring a punch or a shot put throw with an accelerometer, but suddenly stopped working, and "locked" into a value, has I was testing it. When ...
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1answer
1k views

I2C protocol debugging using oscilloscope

We are testing an I2C accelerometer connected to the ATMega32A micro-controller. The accelerometer was working fine. We can write and read the registers using I2C protocol. When connected to the ...
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1answer
416 views

Calculating mV/g of a sensor

I have constructed a piezo-resistive sensor using graphite. I managed to obtain the output voltage of 0-5V by using the ADC of my Arduino to read the sensor. But I have no idea how to calculate its ...
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1answer
2k views

What are the limitations of IMU sensor devices?

The Oculus Rift DK2 virtual reality headset uses an IR camera in conjunction with built-in accelerometer/gyro/magnetometer for accurate head/motion tracking. The previous version (DK1) used only an ...
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1answer
63 views

Cannot get the “Output Axis” to work

I have a Virtuabotix MMA7361 Three Axis Accelerometer Module that I am trying to use to detect tilt. It works, but only for two axes at a time. It doesn't matter which way I try to flip or turn the ...
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2answers
6k views

converting mV to g

I have recently run a vibration test at work using a PCB piezotronics model 482C sensor signal conditioner. How do you convert the the MAX reading (in mV) into the equivalent acceleration (in g). The ...
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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....
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0answers
379 views

Data from BMA220 accelerometer

I am trying to make a device which can give x, y, z data and also can detect freefall and shock. For that I am using bma220 sensor. I am programming the sensor in 8g as I need shock values < 8g. ...
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1answer
986 views

Regarding Direction calculation using Gyroscope,Magnetometer and Accelerometer

We are using a MEMS tri-axial sensor which has an Accelerometer,Magnetometer and Gyrometer. We have also calibrated the Accelerometer and Magnetometer.This sensor package is used in a borehole ...
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2answers
136 views

Most energy efficient way to detect motion

I am hacking together a prototype wrist band, with BLE as the main component. I'd like the device to detect a bump or a wave. What would be the most energy efficient way to do so? I'd like the ...
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1answer
316 views

MMA8453 accelerometer I2C problem

I ran into an issue with my project. I use Renesas RL78 microcontroller and on one I2C bus I have two sensors: digital compass and accelerometer. Accelerometer type is MMA8453 by Freescale. ...
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1answer
334 views

Gyro vs accelerometer for rotational acceleration

For the same price chip, which will be more accurate to measure rotational acceleration: a gyroscope, or an accelerometer 10cm away from the pivot point?
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1answer
846 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
619 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
610 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
629 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 ...