How can I detect that the device is rotated 360 degrees, given a (x,y,z) gyroscope?


Salman 500

I am using react-native-sensor to get raw data from sensor.

setUpdateIntervalForType(SensorTypes.gyroscope, 100)

gyroscope.subscribe(({ x, y, z, timestamp }) => {
  let pitch = Math.atan2(-x, -z) * 180 / Math.PI;// In degrees
  let roll = Math.atan2(-y, -x) * 180 / Math.PI;// In degrees
  let yaw = Math.atan2(y, -z) * 180 / Math.PI;// In degrees
  
  this.setState({pitch: pitch, roll: roll, yaw: yaw})
})

How do I know the device is rotated 360

Michal Karbownik

little theory

Generally, gyroscopes measure rotational motion . Most of the sensors included in the phone will specifically measure angular velocity . This means that in most cases the output will describe how much the phone has rotated over time, usually expressed in degrees per second ( °/s).

You can rotate around 3 axes: x, y and z. There is a nice picture in the MATLAB documentation:

telephone axis representation

There are also 3 important concepts (which you used in the snippet): pitch , roll and yaw (or azimuth ). Also, the MATLAB documentation is handy. They describe this well in the "More About" section, but I recommend reading the entire article.

get your hands dirty

As far as I know, the react-native-sensors library will return exact degrees per second . This means that, using the provided timestamp, you can try to calculate how much the phone has rotated around any axis in any time increment. You just need to save the value and timestamp, do some conversion and you will get the result. However, this will require additional time and memory.

There is an easier way, which you may have realized after reading the attachment. Use pitch, roll or yaw depending on the axis you want to rotate around.

Also, if you're only using this library to get gyroscope data, you might want to consider the Detect Device Orientation Web API . It's still an experimental feature, but works in most modern browsers.

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