Questions tagged [accelerometer]

A sensor to measure acceleration.

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4
votes
2answers
211 views

Is there a better filter or a modification to the Kalman filter that could take advantage of having all the data during the trajectory at once?

I am trying to reconstruct the trajectory of an object with an strapped down IMU on board to do dead reckoning. A Kalman filter seems to be in order. But the Kalman filter seems to be oriented toward ...
3
votes
3answers
483 views

in-car truck vibration/acceleration/gyro chip suggestion?

a project of mine requires to detect how much current vibration / acceleration is in units of (G), the car will carry important instruments, and the driver will be notified if the vibration is over ...
3
votes
3answers
4k views

How to detect angular position of a device mounted on a rotating wheel?

Is there a sensor that can sense whenever rotating wheel pass the ground? Like when mounted on a bicycle wheel rims, but without anything mounted on a bicycle frame - only mounting on a wheel it self ...
3
votes
3answers
420 views

Using a Wii Nunchuck for data collection

Anyone got a good tutorial on using and Arduino to capture the Wii Nunchuck accelerometer data?
3
votes
2answers
603 views

A speedometer like chip

Is there a device which acts like an accelerometer but only measures absolute velocity? I could integrate the accelerometer's output but errors quickly accumulate and cause problems. Preferably the ...
3
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6answers
10k views

Calculate G's of an Accelerometer

Pat asks: Accelerometer Breakout Board - ADXL193 +/-250g could you tell me if this is correct. Looking at the data sheet the mid sensitivity is about 8mv/G @ 5volts. If I use a 10bit adc @ 5volts ...
3
votes
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 ...
3
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3answers
1k views

Determining the angular displacement of a steering wheel

I am working on a project in which I am designing a vehicle driving simulator. In this project I need to measure the angular displacement of the steering wheel. The car in software simulator ...
3
votes
2answers
9k views

Choosing an accelerometer

I would like some help in choosing the right accelerometer for my application. I have been looking at a lot of accelerometers from various major manufacturers and have done some testing on one of the ...
3
votes
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 ...
3
votes
1answer
865 views

Accelerometer readings, what is wrong?

I made a board with the Analog Devices ADXL345. I then attached it to my robot and did obstacle avoidance with data logging for about 10s. The robot made 4 turns. Here is a graph of z-axis readings. I ...
3
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2answers
576 views

Gyroscope questions: building a stable platform

I'm embarking on a summer project and have a few questions. I'm planning to build a 3-axis stable platform for electronics. (Picture a flat surface that stays parallel with respect to the ground while ...
3
votes
3answers
742 views

Which accelerometer and storage chip should I use to measure Foosball rod acceleration?

I want to prove my coworker rotates and laterally moves a foosball rod twice as fast as me. I was thinking I'd need a biaxial accelerometer (which one?) attached to the rod in between men (to not ...
3
votes
1answer
11k views

Rotating a gyroscope's output values into an earth-relative reference frame

For whatever reason, I seem to have gotten myself twisted into quite a confusion on how to process data from my 3 axis gyro and 3 axis accelerometer to get gyro rotation values related to the earth's ...
3
votes
1answer
128 views

Finding an accelerometer

How do I go about finding/calculating the specifications of an accelerometer that can measure vibrations upto 2kHz and deflections upto 2mm? EDIT: After calculating and obtaining 16000g's worth of ...
3
votes
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 ...
3
votes
2answers
4k views

low pass filter design for accelerometer

I find the following code for a simple implementation of a low pass filter. #define alpha 0.1 accelX = (acceleration.x * alpha) + (accelX * (1.0 - alpha)); I have been experimenting with the value ...
3
votes
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....
3
votes
1answer
4k views

Samsung Galaxy S accelerometer details

I'm working on a project on the Samsung Galaxy S smartphone. I need to know some additional information on its accelerometer that I can't find. Accelerometer datasheet I need to know following ...
3
votes
1answer
679 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 ...
3
votes
1answer
475 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 ...
3
votes
2answers
355 views

Circuit movement detector

I'm looking for some simple schematic for movement detection. I want to use it with a small hobby project of my own to detect if someone is moving the box, doesn't matter the direction. I'm looking ...
3
votes
1answer
211 views

Choosing regulator for gyro's and accelerometer

Should I choose a linear regulator that has good transient response? or ultra low Vrms noise? or high accuracy? I am using digital accelerometers and gyros (BMA180 and ITG3200).
3
votes
2answers
126 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 ...
3
votes
1answer
3k 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 ...
3
votes
3answers
3k 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 ...
3
votes
1answer
414 views

Problem stacking accelerometer and SD card shields on Arduino UNO

I have an ADXL345 accelerometer on a Makershield stacked on top of a Seeed SD card shield. Both of those are stacked on an Arduino UNO R2. I've got each working individually, but when stacked they ...
3
votes
1answer
88 views

Accelerometer Drift?

I'm using an ST Microelectronics LIS3DSH accelerometer to detect tilt over an extended period of time. I have the accelerometer securely mounted to a stationary object away from any vibration. Over ...
3
votes
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 ...
3
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1answer
335 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?
3
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2answers
2k views

Sensors to detect and measure movement

I would like to know which sensors should I use in order to get measurement of a movement of my device (slow speed movement on a 2D plane, in cm or mm if possible). The goal is to find out if the user ...
3
votes
2answers
3k views

Arduino UNO and ADXL345 getting 0 0 0 OR -1 -1 -1 outputs with SPI communication

I have EVAL-ADXL345Z evaluation board from Analog Device hooked up to the Arduino UNO R3, the code complies and runs fine. At first I could still get the output values, but after sometime the output ...
2
votes
2answers
2k views

Accelerometer switch to trigger LED fade

I'm planning out a very simple circuit using an LED, capacitor, switch and a battery. The Idea is that the LED is off until something "bumps into" the circuit. At this point it should light up and ...
2
votes
4answers
3k views

Fall Detection using Accelerometer

I am now developing a micro-controller based system that detects when a person falls down using Accelerometer. The accelerometer might be placed in the person's cloth pockets. The important thing is ...
2
votes
4answers
7k views

Did anyone build an accelerometer-based mouse? [closed]

To save my hands from CTS (Capal Tunnel Syndrome), I want to have a mouse that uses an accelerometer, connected to any limb in the body, to replace the conventional mouse that you move with your hand. ...
2
votes
3answers
3k views

How to interpret TI Chronos watch accelerometer data

I've been trying for an embaressing amount of time to figure out how to interpret the wireless accelerometer data from the TI Chronos. From my laptop with the usb-radio included, I read it into python ...
2
votes
2answers
2k views

Measure RPM with a discrete component?

I have a problem that I need to measure an RPM of a rotating axle with a single element (circuit) attached to it - i.e. I can't use a hall effect sensor, because I can't use a separate magnet - I can ...
2
votes
1answer
498 views

Cheap alternative to an accelerometer [closed]

I am designing a very simple device, which absolutely needs to be inexpensive, total BOM cost < $1.00 including the MCU (at 10k+ units). This device would benefit from knowing its orientation, ...
2
votes
3answers
7k views

Small Wireless Gyroscope & Accelerometer

I'm looking to assemble a very small circuit to transmit data from a gyroscope and/or accelerometer to a computer via wi-fi. It also needs to be self-contained (so should contain a power source). The ...
2
votes
1answer
2k views

What is the most common type of accelerometers in today's smartphones?

I know there are 6 different types of sensors for measuring acceleration: Capacitive Piezoelectric Piezoresistive Hall Effect Magnetoresistive Heat transfer-based I have trouble finding a source ...
2
votes
1answer
298 views

Acceleration sensor in HTC phone

Does anyone know which acceleration sensor was used in the HTC Touch Diamond mobile phone?
2
votes
4answers
218 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 ...
2
votes
2answers
513 views

Measuring the balance of a rowing boat

Basically, I'm an amateur rower with mechanical engineering experience, however I am lacking in electronic knowledge. I need to find a way of measuring the pitch of the boat whilst I'm rowing, the ...
2
votes
1answer
2k views

Building a small 3-axis accelerometer mote

I'd like to build a remote device which reports its current 3-axis acceleration to a nearby (<10m) receiver. It needs to be as light and as small as possible. (I have no preference as to the ...
2
votes
1answer
315 views

Realistic Magnetometer Specifications [closed]

I'm working on making improvements to an old project I helped design. The project used an Arduino to take measurements from six sensors to measure the strength of a nearby electromagnet that generated ...
2
votes
1answer
555 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 ...
2
votes
1answer
7k 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 ...
2
votes
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 ...
2
votes
2answers
626 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 ...
2
votes
1answer
798 views

Accelerometer IC single/double click event

What are Accelerometer single and double click event, can someone clarify it for me with some theory and/or practice?