A gyroscope measures angular orientation and is calibrated relative to it's starting orientation. A true Gyro is a relatively rare and expensive piece of equipment, Most MEMs based "gyros" are actually rate gyros which have an output proportional to the rate of change of angular orientation.

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57 views

Fixing a noisy I2C bus

I'm trying to get an I2C bus working but there's a ton of noise and I don't really know what's causing it. The circuit is pretty simple, an ITG-3200 and an Arduino DUE. Here is the problem: As you ...
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29 views

Gyroscope sensor modeling understand

I'm trying to understand the gyroscope sensor model equation from this tutorial It says all sensor can be linearly modeled like this: and Sensitivity of sensor X-axis to X-axis inputs (Sx) ...
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23 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 ...
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1answer
86 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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4answers
89 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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272 views

Calculating angle using MPU6050

I'm using the code from the question Calculating Angles from MPU6050 for my project I'm using a MPU6050, GY-521 and an Arduino Mega 2560 with connections as follows: ...
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1answer
1k 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
80 views

MPU-6050 doubt in playgroud code Arduino.cc

I am studying the MPU-6050 and saw this article. I'm wondering in two lines of code. http://playground.arduino.cc/Main/MPU-6050 This line from what I understand the shield guard reading the last ...
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3answers
782 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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29 views

Time constant for a complimentary filter with different sampling rates

The gyro and accelerometer I am using have different sampling rates (760 Hz and 800 Hz). As a result filter coefficients, alpha and beta, will not add up to 1 if I want to keep the same time ...
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1answer
79 views

Understanding ST L3GD20 Gyro datasheet's cut-off value

Table 21 on page 32 of the L3GD20 datasheet has a column named cut-off: The data sheet doesn't explain what this is, and it doesn't even have a unit. Does anyone what it means?
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104 views

Components needed to determine position in 3 dimensions?

I'm trying to make a quadcopter using an arduino as a base. I've read on some physics involving determining pitch, yaw and roll and it seems like I'll need a gyroscope and a accelerometer. However, ...
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69 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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198 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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48 views

Is there an influence of accelaration on the gyroscope data

I want to create an application that measures the horizontal position of the device while accelerating (positive and negative). My biggest concern is that the gyroscope data will be influenced by the ...
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2answers
226 views

Getting relative pitch and roll

This may be more suited for another exchange site, but I thought it'd try here anyway. I'm trying to figure out how to get pitch and roll relative to the ground. Say my vehicle is going up a hill, but ...
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1answer
212 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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2answers
132 views

Memsense nano IMU

I am using Memsense nano IMU and specifically i am interested in getting the three axes Gyroscope data out of its 38 bytes frames. Following are the snapshots of the frames, and collected gyro data ...
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1k 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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Error models for tracking systems

Question in short: what is a suitable model to describe, model or even generate typical errors of a 2D, 3D, 6 DoF tracking system? I am interested in measuring the influence of the quality of ...
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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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2answers
433 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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159 views

Bosch BMI055 Accelerometer/Gyro causes I2C bus to crash when issuing a softreset!

Datasheet: http://ae-bst.resource.bosch.com/media/products/dokumente/bmi055/BST-BMI055-DS000-06.pdf I have recently integrated the Accelerometer of the BMI055 I added a soft reset of the chip at ...
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51 views

Measuring the change of angle on any plane

I've been trying to come up with a system to measure the change in angle on any plane. So basically I hold up my electronics board in some kind of angle, click on a button to reset the measurement, ...
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1answer
168 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
243 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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378 views

Read Gyroscope (& Accelerometer)

So I have an MPU-6050 (Triple Axis Accelerometer & Gyro Breakout), which I use with an Arduino UNO. Everything is connected properly and I can easily read the raw data from the MPU-6050 on the ...
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1answer
751 views

Tracking 2D positioning with IMU Sensor

I am using a miniature car and I want to estimate the position. We can not use GPS modules and most of the tracking systems that I saw, are using IMU senson with the GPS module. In our car we are able ...
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1answer
75 views

Identify which face of a cube is up

I have a device whose shape is a cube and I need to identify in real time which face is up. My current solution is (not yet implemented) is to use a gyro to get angular variation, but I can see 2 ...
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276 views

Am I forced to use a gyro and an accelerometer, to find a relative point in space?

I am quite new into the electronic realm, so forgive my lack of proper terminology. I am planning to build a simple device, that I will be use to manipulate a mesh on my computer. when I move the ...
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2answers
292 views

Is The Magnitude of Gyro XYZ Meaningful?

Say I have a gyro that outputs degrees/second, and I take the euclidean magnitude of the x,y, and z rotations: $$ \text{magnitude} = \sqrt{x^2 + y^2 + z^2} $$ Is this actually useful? Is magnitude ...
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182 views

FOG Yaw Gyro, transformation to remove earths rotation based on attitude (roll,pitch,yaw,latitude)

I'm trying to use an accurate FOG gryo for tracking heading in a moving platform. The FOG gyro has two rate errors, Faraday (fixed amount regardless of alignment to the earth) and the 15.04 degrees ...
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502 views

How to detect gestures with IMU

I am working on a project for which I need to recognize gestures in 3D space. I am building several modules, each of which can be held in one's hand. One can pick up two modules at a time and perform ...
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1answer
421 views

Cancelling drift of a gyro by mounting?

I am trying to design a device that is used for capturing rotation. I think I will be using an IMU from Invensense, as I have a few of them to play with. A big problem gyroscopes seems to be drift, ...
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1answer
536 views

Gyroscopic Drift Correction

I'm currently working on a project where I am pulling readings from 3 Gyroscopes (STM L3G4200D) to a Microcontroller (TI MSP430) and sending orientation data to the user. I've been reading up on ...
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2answers
536 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 ...
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1answer
349 views

L3G4200D random spikes

I've searched this forum a bit in regards to the L3G4200D gyroscope, and haven't seen this problem mentioned, but I have seen others talk about it on other forums. I am seeing a strange large value in ...
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4answers
600 views

What sensor to use for sensing azimuth & altitude of satellite dish?

Instead of using a motor encoder, what electronics sensor I could use to know the position of a satellite dish? In this case will be the Azimuth and Altitude of the dish (2-axis). Magnetometer, ...
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1answer
207 views

Accelerometer and/or Gyroscope for gesture sensing

I want to sense 3D motion (gesture). I have 3 axis accelerometer. But I am confused if I need a gyroscope or not for orientation and rotation sensing. Isn't it possible to measure them from ...
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3answers
6k views

How to add additional I2C sensor module on Arduino

I have tried the GY-521 sensor on Arduino by using the guide from (http://playground.arduino.cc/Main/MPU-6050). It worked well. Can anyone guide me on how can I add another GY-521 module please? I am ...
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2answers
324 views

Gyroscope and compass. When its better to use one instead of another?

Why people prefer gyroscope instead of compass? Does gyroscope replace compass? I would like to see the pros and cons of each.
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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 ...
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Msp430g2553 i2c communication library with itg3200 gyroscope

I've been creating an I2C library for communicating with ITG3200 gyroscope for MSP430g2553 experimental launchpad. I still have slight problems with sequential reading and the signed values but I'm ...
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178 views

Reading from an ITG-3200 Gyroscope

I'm having some trouble getting any reading from an I2C ITG-3200 Gyroscope breakout I'm using from Sparkfun. Here is the product: https://www.sparkfun.com/products/9801 I have a feeling this might be ...
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1answer
392 views

Teensy 3.0 (TeensyDuino) + L3G4200D === “574” reading? Why? How to fix?

I have an Arduino Uno, an Arduino Nano, a Teensy 3.0 and a 3-axis gyroscope (L3G4200D module from Parallax ...
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190 views

L3G4200D Gyroscope not sending ACK

I am working on interfacing to a L3G4200D Gyroscope breakout board . I am using it in I2C mode, and the microcontroller I use is the 8051 (via bit banging). I havent connected anything to the SDO ...
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1answer
435 views

How to get translation and roation data using 6DOF MPU6150

I am trying to get the position data from an IMU 6 Degrees of Freedom (MPU-6150) board using an Arduino Uno. I am trying Jeff Rowberg’s example MPU6050_DMP6.ino that may be found here. This is the ...
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444 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. ...
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243 views

Calculating covered distance using AHSR sensor

I want to measure in real-time the distance covered by a AHSR sensor between two points (basically I am trying to measure the stride length during the walk, so I will attach the sensor to a foot, and ...
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1answer
10k 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 ...