Accelerometer { id: accelerometer }
Image {
    source: "image://theme/icon-m-capslock"
    rotation: {
        if (!accelerometer.reading) return 0;
        var x = accelerometer.reading.x;
        var y = accelerometer.reading.y;
        return 90 - Math.atan2(y, x) * 180 / Math.PI;
    }
}