I am trying to profile the bracelet device to measure the wrist movement through the acclerometer or gyroscope
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I want to find user movement walking and tracking position and move camera accordingly in virtual reality app , not head movements like rotation , etc. So I am wondering whether this combination Gear VR with Samsung S7 edge will support my requirement or not.
Any suggestion will be appreciated , thank you.
GearVR is not meant to be a 6-DoF device, which is what you are asking (3 Degrees of Freedom means tracking of rotation, 6 Degrees of Freedom means rotation + position).
It is possible to achieve 6-DoF tracking with a Samsung Galaxy by using ARCore. A good starting point would be this GitHub project.
However, the results will most likely not meet your expectations in terms of usability. If you intend to use the original GearVR goggles, you'll notice that the camera is covered, so that would be a problem as well.
If you really want quality mobile 6-DoF VR (read: goggles, not a smartphone in your hands), you should look out for Vive Focus or Oculus Quest as a device.
I am working on a mobile car game, in which I utilized my phone accelerometer sensor to move the car.
Should I use sensor fusion? I don't need to get the sensor readings, I only need to move and rotate my car according to my phone's movement, and I see that it moves fine.
I know by combining accelerometer and gyroscope, we can access the gravity and device motion separately. But I need to know how does Xcode calculate it when I simply using devicemotion.gravity. Any algorithm available?
I wrote an app which displays pitch and roll attitude (a glass cockpit app). When I rotate or tilt the iPhone/iPad the attitude is displayed accurately. When I'm flying in an airplane and rotate or tilt the device it also displays accurately. Now, when I hold the device against the panel and roll the airplane, the attitude does not change accurately - it doesn't move at all. This is strange behavior to me and I wonder if it has something to do with the accelerations of the airplane affecting the output of the gyro in the device.
Any insight is appreciated.
Randy, a roll is a one-G maneuver, right? So there is no acceleration for the accelerometer in the phone to sense.
Watch Bob Hoover roll his Shrike while pouring a glass of iced tea from a pitcher.
I am about to use iPhone 4's gyroscope/GPS on a game, to detect rotation and translation. As far as I know, the gyroscope can be used to detect rotations in all 3 axis.
But rotations, at least on the horizontal plane can be detected with the compass, tilts can be detected with the accelerometer and positions with the GPS.
Can a combination of compass/accelerometer/GPS create the same level of detection of gyroscope/GPS? (I am thinking of allowing this combination for people without iPhone 4).
Will this work perfectly?
The precision of the gyroscope and accelerometer sensors is much greater than the precision of the compass and GPS. The compass and GPS are for finding out where the device is on the globe, and the gyroscope and accelerometer are good for finding out where the device has moved in the last few milliseconds.
Therefore it depends upon what you're trying to control with the device's movement. Trying to simulate a gyroscope input to control a 3D simulation (like the Jenga game Jobs showed in the keynote that introduced the iPhone 4) will not work perfectly with just the compass/accelerometer/GPS. Figuring out if the device is pointed at the grocery store on the west side of the street instead of the furniture store on the east side of the street in an augmented reality game will work perfectly with just the compass/accelerometer/GPS.