How can i rotate the camera around an object, using compass?

Question

I want the camera to rotate around an object in Y axis, when you rotate your phone. how can i do this?

i already have the code to do it using mouse, but i need it to turn with compass. here's the code for movement with mouse:

    mouseX = Input.GetAxis("Mouse X");
    offset = (Quaternion.AngleAxis(mouseX * cameraSpeed, Vector3.up) * offset);        
    transform.position = point + offset;
    transform.LookAt(point);

i know that setting the mouseX value to change with compass direction is my answer, but how can i do it?

Answer 1

void Start() {
    // If you need an accurate heading to true north, 
    // start the location service so Unity can correct for local deviations:
    Input.location.Start();

    // Start the compass.
    Input.compass.enabled = true;
}

void Update() {
    Quaternion rotation = Quaternion.Euler(0f, input.compass.trueHeading, 0f);
    // You can use compass.magneticHeading instead
    // if you don't need alignment to true north.

    // Position camera at a rotated offset relative to its center point.
    transform.position = point + rotation * offset;

    // Look at the center point.
    transform.LookAt(point);
}