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Jun 17th, 2023

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print("autosoftoff.boot.js");
function dotProduct(x1, y1, z1, x2, y2, z2) {
const vectorA = [x1, y1, z1];
const vectorB = [x2, y2, z2];
let result = 0;
for (let i = 0; i < vectorA.length; i++) {
result += vectorA[i] * vectorB[i];
}
return result;
}
let interval = 300000;
let compassOnTime = 1100;
function compassProm() {
return new Promise((resolve,reject) => {
Bangle.setCompassPower(1);
let h;
setTimeout(()=> {
h = Bangle.getCompass().heading;
//print("READING: " + h);
Bangle.setCompassPower(0);
resolve(h);
},compassOnTime);
});
}
let accelOld = Bangle.getAccel();
let compassOld = compassProm().then(mag=>{
setInterval(()=>{
let compassNow = compassProm().then(mag2=> {
let accelNow = Bangle.getAccel();
const dotp = dotProduct(accelOld.x, accelOld.y, accelOld.z, accelNow.x, accelNow.y, accelNow.z);
//print(dotp);
let magDiff = Math.abs(mag2 - compassOld);
magDiff = Math.min(magDiff,360-magDiff);
//print(magDiff);
return new Promise((resolve,reject)=>{
if ( dotp > 1 && dotp <= 1.036 && !isNaN(magDiff) && magDiff < 4 )
{
//print("Stationary");
let buzzDur = 2000;
Bangle.buzz(buzzDur);
Bangle.beep(buzzDur).then(x=>resolve(true));
} else {
resolve(false);
}
accelOld = accelNow;
compassOld = mag2;
});
}).then(still=>{
if ( still ) {
//Going to sleep
Bangle.softOff();
}
});
},interval);
});

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