# Tagged Questions

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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### Main Idea of Gyro [migrated]

[![enter image description here][3]][3] Hi,I have a L3G4200D (GY-50 model) gyroscope.I have been trying to learn how gryo sensor works.Circuit diagram is attached.I want to ask some questions; a) ...
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### Using Gyroscope data need to stabilise the Objects

I am working on a system that maintains its fixed position i.e does not vibrate in a situation like Earth Quake or any Vibration of Machine/Tremor like situation occurs. Now for that system i first ...
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### Converting IMU (MPU6050) raw data for a single axis and gyro init

I am looking to use the MPU6050 on a self balancing bicycle. I am using a PIC micro as the interfacing MCU. I am only interested in the angle in one axis (I'm only interested in roll). I have some ...
39 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 ...
184 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 ...
438 views

### Converting raw gyro (L3GD20H) values into Angles

As per my understanding, in order to convert the raw gyro values into Angles. I need to first multiply the raw values of each axis with the sensitivity level. Example : //Convert Gyro raw to ...
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### How to track the 3d movement of a small animal in a 4x4x8 meter cage?

I need to track the movement of a small animal (60 grams) in a cage which contains plants, shelter, branches and so on. I need all three coordinates in real time. Spatial resolution should should not ...
196 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 ...
63 views

### Analog Devices Gyro: What are these pins for?

I am after some guidance please. I am designing a basic PCB which includes an ADXRS646 gyro. This is the first time I have designed a circuit with a BGA package and I do not understand the purpose of ...
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### 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 ...
147 views

### Gyroscope Problem

I am working at a project which requires to determine the roll of a device. I studied the method through I can do this and I find that an IMU (Inertial Measurement Unit) could help me. I started with ...
355 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 ...
190 views

### Can ST L3GD20 Gyro's Low pass filter be disabled?

I am fairly new to hardware and datasheets and looking at the datasheet of ST's L3GD20 Gyro I know that the high pass filter's frequency can be chosen, but it can also be disabled at all. I cannot ...
179 views

### Gyroscope bias on the MPU9150

I've recently purchased the MPU9150 IMU from InvenSense. Testing it, I'm astonished to see that, at rest, it constantly output 0.25 °⋅s-1 around the Z axis, -0.5 °⋅s-1 around the Y axis and -1 °⋅s-1 ...
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### Gyro-based mechanical stabilization in robotics

I'm from a computer engineering background and have a good knowledge about programming microcontrollers. I want to create a small plastic plane that is always kept parallel to ground regardless of the ...
345 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 ...
815 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, ...
131 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 ...
9k 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 ...
202 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 ...
2k 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 ...
213 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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### 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, it'...
187 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. ...
427 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 ...
416 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 ...
254 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?
212 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 ...
5k 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 ...
8k views

### 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 ...
1k 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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### 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, ...
324 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 ...
606 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 ...
2k 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 ...
80 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 ...
431 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 ...
654 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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### 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 ...
988 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, ...
1k 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 ...
1k 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 ...
495 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 ...
1k 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, ...
306 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 ...
9k views

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 ...
619 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 ...