Questions tagged [accelerometer]

A sensor to measure acceleration.

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2answers
352 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
567 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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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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2answers
59k 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) ...
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1answer
828 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
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1answer
168 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
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1answer
382 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
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1answer
257 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
63 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
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1answer
499 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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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
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1answer
69k 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
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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....
9
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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 ...
0
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1answer
213 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
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1answer
156 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
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1answer
127 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'...
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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
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1answer
99 views

What means linear response for accelerometers?

What means that accelerometers measures linear acceleration and, in particular, that they are a linear response?
1
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1answer
542 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
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2answers
193 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
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1answer
722 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
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1answer
127 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
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1answer
475 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 ...
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1answer
625 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 ...
0
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1answer
396 views

Is LSM303dlhc INT1 active HI and DRDY active LO?

I just want to make sure I am approaching my LSM303DLHC design properly, and that I'm correct in the active state of the two pins. I setup the following registers as indicated: ...
2
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3answers
2k views

LSM303DLHC low-power and high precision modes

The LSM303DLHC is a 3-axis accelerometer + 3-axis magnetometer chip from ST. The datasheet is a bit light on details however. I'm trying to work out what is different about the low-power mode and how ...
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1answer
1k views

Accelerometer on doors and windows

We have made a mistake. We created this pcb with accelerometer , a very good one (ADXL345) datasheet here and it sleeps ,and waking up on acceleration event. in our case we set it to almost the ...
2
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3answers
613 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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1answer
1k views

Accelerometer X/Y/Z “high events”

I'm looking at this accelerometer LIS3DH and the datasheet says that it could enable interrupt generation on X/Y/Z "high" or "low" events. What do these events actually mean? When are "high events" ...
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2answers
239 views

What are the units of the measurements that come out of an accelerometer?

I'm pulling samples out of this accelerometer that I've configured for high resolution mode: and I'm trying to understand the units of what's coming out. Some places online seem to indicate just <...
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1answer
403 views

Cancellling Out the Effect of Constant Gravitational Acceleration in a Datalogger

In a design that records not only accelerometer readings (X + Y + Z) but also gyroscopic readings (X + Y + Z) how is it possible to remove the accelerometer readings caused by gravity? I have found ...
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4answers
832 views

Linear accelerometer on a rotating platform

I want to measure the linear speed of a vehicle putting the accelerometer on its wheel. Assume the vehicle is moving at a velocity 70 KMPH and its wheel has a radius (R = Radius) 30 CM. I made this ...
0
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4answers
2k views

Converting two's complement hex values to binary?

I'm reading x-axis accelerometer data from an IC via the I2C bus using I2C-Tools ( specifically i2cget ) in Linux. Here is the code that is reading these values: <...
0
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1answer
221 views

Analyzing Accelerometer / Gyroscopic Data [closed]

I have created a data logger that logs acceleration and Gyroscopic data on to an SD card. The logged data is about 1.5GB in the form of txt files. I wish to perform thorough analysis on this data via ...
4
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1answer
449 views

Can I reduce energy consumption if I disable accelerometer's axes?

I'm using LIS3DH accelerometer, a 3 axes accelerometer to build a low energy consumption device. For now I just need the Y axis. If I disable X and Z, can I save more energy or the accelerometer use ...
2
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2answers
228 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 ...
3
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1answer
17k views

Wiring a GY-521 to an Arduino Uno R3?

I am searching for a non-technical picture or diagram or explicit textual instructions explaining how to wire a GY-521 Accelerometer/Gyro to an Arduino Uno R3. I am a software developer and need ...
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1answer
73 views

How do wearables track exercises without taking input from user?

Recently there have been wearable devices that can track your exercises and reps (eg bench press, push ups, pull ups) without the user telling them. What technology do they use to track these ...
0
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1answer
871 views

Angle errors in IMU (using Accl & Gyro)

I am making Autonomous Quad. I am programming my IMU using ADXL335 -3 Axis analog Accelerometer & L3G4200D 3-axis digital Gyro. I am using ARM Cortex M4F based TI's stellaris launchpad LM4F120XL. ...
0
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2answers
366 views

Accelerometer sensitivity range

I'm looking at the KX023 and it seems to have a 64 counts/g sensitivity. Its datasheet specifies the following What I don't quite understand is why there're two sets of figures. The top set goes up ...
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0answers
215 views

Is “transient detection” exclusive to Freescale?

I'd like to detect the dynamic component of acceleration, i.e. the change in acceleration, and generate an interrupt when such change is detected. I see that MMA8451/2/3 calls this "Transient ...
3
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2answers
138 views

Unreasonably high current draw

With the MMA8452, it claims that it draws 44uA when ODR = 100Hz in Normal Mode. However, I'm measuring 1.5mA when ODR = 100Hz. Does anyone know how this could be the case? In Low Power Mode, I'm ...
0
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1answer
289 views

Accelerometers and transient acceleration

I'm trying to understand the notion of transient acceleration threshold. I'm working with the popular MMA8452 and the way I understand transient acceleration is that it represents the dynamic ...
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2answers
120 views

How do you make a usb device thats just an accelerometer

So I'm trying to do this with as few components as possible. Also, If possible I would like to skip the microcontroller all together. So how would it be done with a triple axis accelerometer? Any ...
2
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2answers
746 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
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
2k views

Problem in reading accelerometer axis (ATMEGA328P + ADXL345)

I really need help with my project. I'm trying to connect ADXL345 with ATMEGA328P through SPI interface to send received data from Atmega328P to PC via UART interface. The ATMEGA328P is sending the ...
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3answers
169 views

Do registers on a chip wipe when disconnected from the power?

I'm making a project with Arduino, and I have a question about a chip I'm using, the MPU9150, a 9-axis accelerometer+gyroscope+magnetometer. I wanted to know if its registers are wiped when the power ...
0
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2answers
460 views

Generating exact frequency of vibration with motors

I measured the frequency of motors with an accelerometer (ADXL335), but the frequency from my measurement is a lot different from the frequency specified in the product page. I tested with two ...

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