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function startCalibration() {
// Prompt the user to perform the figure-eight calibration
showCalibrationPrompt();
let calibrationData = [];
window.addEventListener('deviceorientation', function(event) {
calibrationData.push({
x: event.magneticField.x,
y: event.magneticField.y,
z: event.magneticField.z
});
});
// After a certain time or data points
setTimeout(function() {
window.removeEventListener('deviceorientation', ...);
let calibrationParams = calculateCalibrationParams(calibrationData);
applyCalibrationParams(calibrationParams);
}, 10000); // 10 seconds
}
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// Simplified Kalman filter example
let kalmanFilter = {
Q: 0.01, // Process noise covariance
R: 0.1, // Measurement noise covariance
P: 1, // Estimate error covariance
x: 0 // Estimate
};
function updateKalmanFilter(measurement) {
// Prediction step
let x_ = kalmanFilter.x;
let P_ = kalmanFilter.P + kalmanFilter.Q;
// Update step
let K = P_ / (P_ + kalmanFilter.R);
kalmanFilter.x = x_ + K * (measurement - x_);
kalmanFilter.P = (1 - K) * P_;
return kalmanFilter.x;
}
// Use the filter to smooth magnetometer data
window.addEventListener('deviceorientation', function(event) {
let smoothedX = updateKalmanFilter(event.magneticField.x);
// ... use smoothedX for heading calculation
});
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let gyroWeight = 0.98; // Weight for gyroscope data
let accelMagWeight = 0.02; // Weight for accelerometer/magnetometer data
let lastTimestamp = null;
let currentHeading = 0; // Initial heading
window.addEventListener('deviceorientation', function(event) {
let alpha = event.alpha; // Compass heading (from magnetometer)
let beta = event.beta; // Pitch (from accelerometer)
let gamma = event.gamma; // Roll (from accelerometer)
let now = Date.now();
let dt = (lastTimestamp === null) ? 0 : (now - lastTimestamp) / 1000; // Time difference in seconds
lastTimestamp = now;
let gyroRate = event.rotationRate.alpha || 0; // Rotation rate around z-axis
// Complementary filter
currentHeading = gyroWeight * (currentHeading + gyroRate * dt) + accelMagWeight * alpha;
// Normalize heading to 0-360 degrees
currentHeading = (currentHeading % 360 + 360) % 360;
// Use currentHeading for compass display
updateCompassDisplay(currentHeading);
});
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