A sensor to measure acceleration.

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0answers
19 views

Reading orientation with Arduino sensors. e.g gyro, accelerometer, compass

I am trying to create a situation in which I can read the data from these a gyro module to give an absolute reading in relation to the starting point. For example, a wireless potentiometer giving a ...
-1
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1answer
36 views

What means linear response for accelerometers?

What means that accelerometers measures linear acceleration and, in particular, that they are a linear response?
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1answer
44 views

Interface RTC and Accelerometer to Arduino UNO board [on hold]

We are trying to interface RTC DS1307 & ACCELEROMETER ADXL345 on arduino UNO board. Both these requires analog pin A4 and A5 of arduino but at a time we are able to connect only one of the deive, ...
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2answers
46 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
100 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. ...
0
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0answers
24 views

FXOS8700CQ Magnetometer Not Outputting Values

I'm currently getting to grips with the FRDM-K64f board and am attempting to access the onboard FXOS8700CQ chip to calculate orientation information. I've managed to get the accelerometer information ...
0
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0answers
42 views

Variation in accelerometer interrupts

I am using LIS2DH12 accelerometer from ST Microelectronics. When I configure it to give interrupts at 400Hz. I am seeing variations from 380Hz to 414Hz. Is this behaviour normal or does the ...
0
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1answer
34 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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0answers
21 views

Varaition in accelerometer interrupts

I am using LIS2DH12 accelerometer from ST Microelectronics. When I configure it to give interrupts at 400Hz I am seeing variations from 380Hz to 414Hz. Is this behaviour normal or does the ...
0
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1answer
62 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
45 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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0answers
24 views

Best setup of LSM303DLHC to measure sound at low frequencies

I wish to use a LSM303DLHC to "measure" very low frequency sound. I believe the sound to be in the neighborhood of about 10hz. It's really a guess - I just know the sound is strong/loud, can not be ...
0
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1answer
25 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: ...
0
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2answers
73 views

Simulate Gyroscope through MEMS accelerometer

Is possible to simulate the Gyroscope using Accelerometer values? I would like to make that in Android Context so using MEMS smartphone accelerometer.
0
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0answers
60 views

I cant get more than 30 degree difference with acceloremeter

I want to get output from adxl350 acceloremeter as degree. However when I rotate acceloremeter 90 degree it gives 30 degree difference in total as output. I am using matlab with arduino for getting ...
0
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1answer
227 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 ...
0
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1answer
32 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" ...
2
votes
3answers
56 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 ...
0
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2answers
77 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
102 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
45 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 ...
1
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1answer
206 views

Simulating accelerometer in proteus

I am not able to find any libraries for simulating accelerometer in proteus. Is there such a library? If NO, how do i simulate an embedded system that has an accelerometer? Thanks
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4answers
148 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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1answer
48 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 ...
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0answers
87 views

Accelerometer calibration using Gauss Newton Method

I got an ADXL 337 from Sparkfun and My sensor works as follows ...
4
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1answer
406 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 ...
1
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1answer
130 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, ...
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1answer
56 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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2answers
57 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 ...
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0answers
43 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
votes
2answers
102 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
55 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 ...
0
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0answers
43 views

3D accelerometer & Gyroscope LSM330DLC Noise measurement

For Kalman filter I need to have an idea about the sensor's noise so i need the acceleration noise density (Formula : rms Noise= Noise Density * sqrt (BW)) expressed in µg/√Hz. Now I have to convert ...
0
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2answers
83 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 ...
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0answers
155 views

STM32F3-Discovery: accessing LSM303DLHC with I2C fastmode

According to STM32F3 Reference Manual RM0316 and accelerometer/magnetometer LSM303DLHC Datasheet both these devices support I2C fast-mode at 400kHz, yet when I measure the GPIO PB6 (which is mapped to ...
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0answers
29 views

Writing MPU9150's registers

in my project I'm using an MPU9150, connected through I2C to an Arduino. I want to change the accelerometer scale values writing in the appropiate register, but I can't make it work. The relevant code ...
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3answers
84 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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0answers
53 views

How do accelerometers distinguish a tap/shock from motion?

I'm looking at accelerometers like the ADXL345. The ADXL is capable of "tap detection". According to the datasheet, the tap detection threshold is defined in a certain register. If my understanding ...
0
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2answers
76 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 ...
2
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2answers
76 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 ...
0
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2answers
28 views

ADXL345 generating interrupts without MCU

I wonder if it's possible to drive an ADXL345 without an MCU on the board. That is, to set the ADXL345 to generate an interrupt on activity without needed an MCU on board. Could the register values ...
1
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1answer
154 views

Why am I seeing drift when using Madgwick algorithm to correct for orientation with 9 DOF IMU?

I am trying to correctly track orientation of a sensor with accelerometer, gyroscope, and magnometer, using the open source Madgwick algorithm. The algorithm returns quaternions which represent the ...
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0answers
95 views

MPU 6050 dspic33fj128gp802 addition operator problem

I use dspic33fj128gp802 and MPU6050 for my project. Microcontroller succesfully takes the data from sensors 6 channel and sends the data pc via UART. When i want to add "float 2.0" or "int 2" to ...
2
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1answer
203 views

Balancing quadcopter using mpu6050

I am on a project which nearly completed. But what remains is balancing. My project is making a quadcopter. All the programing and hardware stuff is completed. But when i fly it, it doesnt goes up, it ...
0
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1answer
208 views

IMU for joint angle measurement

I am planning to use IMU for joint angle measurement of hand(shoulder ,elbow and wrist joint), I am confused about reference frames of accelerometer and gyroscope. According to my understanding ...
1
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1answer
107 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 ...
0
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1answer
131 views

Does position error from accelerometer still build up quadratically when using Kalman filtering?

I want to implement an inertial navigation system that uses a basic IMU for indoor position tracking. From all the things I've read you need to assist the IMU with something like GPS or other means of ...
0
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4answers
97 views

Best methods for long term position tracking?

I am in the beginning stages of development for a project where I need to continuously track the position of an object for long amounts of time. The object will not move very much, but when it does I ...
0
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1answer
45 views

Assessing accelerometer quality

How can I determine the quality of an accelerometer? Is there a standard measure, such as the SNR, or set of measures? What makes one accelerometer better than another; the accuracy of its sampling ...
5
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1answer
126 views

How would you dampen this little quadcopter?

Well, I made a little quad from scratch. From scratch as in from PCB design. After assembling, testing, some coding, it turns out my accelerometers get WAY TOO MUCH vibrations and I can't detect ...