gyroscope

I am using LG Optimus 2x smartphone(Gyroscope and Accelerometer sensor) for positioning. I want to get correct rotation angles from gyroscope that can be used later on for body to earth coordinate transformation. My question is that How I can measure and remove the drift in gyro sensor. The one way is to take the average of gyro samples (when mobile is in static condition) for some time and subtracting from current sample, which is not good way. When the mobile is in rotation/motion how to get the drift free angles? As far as I know, either the Kalman filter or something similar is implemented

I have the following setup: An iPhone lies with the display to the ceiling on a table (alpha = 0 degrees). When the iPhone is moved upwards like shown in the image above the alpha angle increases. How do I compute the value of the alpha angle without taking care of any other axes which could change. I am only interested in this one axis. How do I get the correct alpha angle the iPhone has when lifting up from the table? How do I get notified when the value of alpha changes? You can use the CMMotionManager class to monitor device motion changes. Objective C // Ensure to keep a strong reference

I have a small remote controlled car going on the room floor. For simplicity let us assume it is moving along say x-axis. Now, the floor seems flat but there are very minute uneven bumps in every surface. So whenever the car is not exactly flat (as it was at starting position) or in other words whenever the car has even slightest of tilt then, Total Acceleration obtained from accelerometer = Linear Acceleration + Acceleration due to tilt My question is how to remove the acceleration due to tilt so that I get only linear acceleration? Can I somehow use gyroscope to do that? Ali I have

I am learning to write an app using the gyroscope sensor in iOS. Are there classes for dealing with the gyroscope similar to UIAcceleration/UIAccelerometer/UIAccelerometerDelegate for the accelerometer? First import CoreMotion framework #import <CoreMotion/CoreMotion.h> self.motionManager = [[CMMotionManager alloc] init]; //Gyroscope if([self.motionManager isGyroAvailable]) { /* Start the gyroscope if it is not active already */ if([self.motionManager isGyroActive] == NO) { /* Update us 2 times a second */ [self.motionManager setGyroUpdateInterval:1.0f / 2.0f]; /* Add on a handler block object

I need some help using gyroscope on iPhone. I can't understand readings from CMAttitude regarding pitch, roll and yaw in a particular situation. This is my code - (void)handleDeviceMotion:(CMDeviceMotion*)motion { NSLog(@"Yaw %f ",attitude.yaw * 180 / M_PI); NSLog(@"Pitch %f ",attitude.pitch * 180 / M_PI); NSLog(@"Roll %f ",attitude.roll * 180 / M_PI); } Let's suppose that iPhone is laying down on a plane as in the following figure: pitch, roll and yaw are (almost) 0 degrees and any turn around an axis returns understandable readings. For example, turning the device right, the Yaw decreases

Now that iOS 4 is no longer NDA, I would like to know what Gyroscope has to offer over the Accelerometer for developers. Is there a difference in APIs? Other things? Yann Ramin A MEMs gyroscope is a rate of change device. As the device rotates in any its axis, you can see a change in rotation. An accelerometer only provides the force along the X,Y,and Z vectors, and cannot solve for "twist". By using both sensors, you can often implement what is referred to as a 6DOF (degrees of freedom) inertial system - or dead reckoning - allowing you to find the relative physical location of the device.