A sensor to measure acceleration.

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46 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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2answers
38 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 ...
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2answers
21 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 ...
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1answer
68 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
63 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
75 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 ...
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47 views

How to convert accelerometer values into fixed reference frame using quaternions?

My aim is to map raw accelerometer, gyroscope, and magnometer data into a "world view" or external reference frame. For example, in my test experiment I move the sensor board vertically up and down ...
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1answer
81 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 ...
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1answer
64 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
72 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 ...
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4answers
80 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 ...
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1answer
42 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 ...
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88 views

What is the most precise position measuring system?

While developing position measuring system I faced the problem of precise data acquisition. There are rather strict requirments for this system: 3 sensors are situated on one surface, the distance ...
5
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1answer
104 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 ...
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0answers
63 views

compute Power Spectral Density from Accelerometer data

I have an accelerometer data i.e. AccX, AccY and AccZ. I am looking for an algorithm to compute Power Spectral Density from this data. I know the following: ...
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1answer
50 views

how to connect the pins of accelerometer MMA7361 [closed]

i have an accelerometer modulw whose pins are 5v,3.3v,x,y,z,sleep,og-detect,g select,selftest. i have connect only 5v,x,y,z please tell me how to use other pins. In my connection it gives random ...
0
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3answers
45 views

How to get values in terms of G in STM32F3 Discovery board

I am working on STM32 F3 Discovery Board. I am accessing accelerometer of the board. While doing so I am getting values for X,Y and Z axes. But these values are some random numbers. I want the output ...
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3answers
93 views

What is the unit of accelerometer module output

I am on a project to track the human body motion in to a 3d design and animation software. I found that acccelerometers are used for these purposes. According to my project what I will need is the ...
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1answer
65 views

Noisy sensor on a prototyping board

I made a small prototyping board where accelerometer data is read into a microprocessor, showing the data from the accelerometer after it is sampled, gives a very noisy signal. (50 mv peaks) I had a ...
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1answer
78 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
34 views

Displacement using accelerometer using known constraints

I am looking to find out the amount of displacement (x,y,z) over a period of 3 seconds using an accelerometer, in this case, the ones found on the iPhone. The purpose is to attach the iPhone on the ...
2
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3answers
533 views

Functionality of Accelerometers

Is it possible to do a speedo meter with an accelerometer ? I am working with Arduino hardware.
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2answers
126 views

How can I convert ADXL335 acceleration data into displacement?

I am using ADXL335 3 axis accelerometer to measure wave elevation on a tank. The data I receive from the sensor is acceleration. I need the displacement of the sensor in x,y and z direction with ...
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1answer
51 views

Interpretation of the graph of accelerometer

I have plotted the raw values of my accelerometer in gnuplot, and the acceleration in the dimensions of x, y and z are as follows... The accelerometer sensor is in a steady position, my question ...
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1answer
153 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 ...
2
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1answer
224 views

MPU6050 DMP values read

I am using MPU6050 breakout board IMU along with ATtiny2313 microcontroller to get the accelerometer and gyroscope values from the IMU. Here's the question : I want to know what values are computer ...
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1answer
71 views

accelerometers vs gyroscopes

In terms of semiconductor integrated circuits, is there any difference between an accelerometer or a gyroscope? are they the same part? Can I get a IC recommendation for something with 3 axis?
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1answer
54 views

ADXL 335 Accelerometer incorrect Output. z and y axes always the same

I have an ADXL 335 Accelerometer. I'm checking its output voltage values using a multimeter and I'm consistently getting the z and y axes giving me the same result. How do I trouble shoot this ...
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2answers
149 views

Understanding use of accelerometers to measure angular (rotational?) accelerataion

Imagine this: A rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to 90 degrees back-and-forth (in the xy plane), so does the rod. My goal is to measure the instantaneous ...
2
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1answer
518 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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3answers
124 views

Using change in magnitude of accelerometer to calculate speed?

I have a wheel (say 60cm in diameter). And I am planning to attach a small board with an AVR and an accelerometer about 10-20cm from the centre. As the wheel spins, I will get acceleration outwards. ...
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0answers
175 views

3-wire SPI Interface between Arduino (Teensy 3.1) and Accelerometer (ADXL344 or ADXL345)

I'm having problems in interfacing and receiving data from the Accelerometer (ADXL344) to my Arduino (Teensy 3.1). I have connected the pins as shown in the attached schematic. Furthermore, I have ...
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117 views

MPU6050 not coming out of sleep mode

I am using the accelerometer-gyroscope-temperature sensor ic MPU6050. When first powered ON, the sleep bit in the power_management_register_1 (bit6) has to be reset so as to start the working of the ...
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98 views

Collision direction using an accelerometer

I'm trying to determine the direction on a vehicle that a collision occurred. After some threshold value is met I've tried a couple of different approaches to determine which direction the collision ...
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0answers
28 views

What sensors to use to track posture devation?

After a cursory glance through google I could not find any information if such a thing is even possible. I believe that its not possible using something like a gyroscope or accelerometer due to the ...
3
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2answers
136 views

Is one accelerometer enough for detecting tilt/orientation of a rigid body?

I posted this question earlier in physics.stackexchange, but I think this is actually the best place for it. I’m not familiar with sensor hardware, and I don’t really know how an accelerometer works. ...
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1answer
250 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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1answer
310 views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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1answer
774 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 ...
3
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2answers
424 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\$ ...
2
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1answer
289 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 ...
1
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1answer
150 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
117 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 ...
0
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1answer
79 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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0answers
60 views

Combine LED with accelerometer in small size for violin bow frog

The question was extended from the post: Violin bow position tracking with SMD LEDs and photoresistors. It is easier to understand the problem and the purpose here with the link, but I will elaborate ...
7
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10answers
3k 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 ...
2
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1answer
118 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
65 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 ...
0
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1answer
183 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
101 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 ...