mirror of https://github.com/espruino/BangleApps
52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
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(function(recorders) {
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recorders.bthrv = function() {
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var lastGetValue = 0;
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var lastUpdate = 0;
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var rrHistory = [];
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var hrv = "";
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function onHRM(h) {
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if(!h.rr) return;
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if (lastUpdate + 3000 < Date.now()){
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rrHistory = [];
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}
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rrHistory = rrHistory.concat(h.rr);
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lastUpdate=Date.now();
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}
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return {
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name : "BT HRV",
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fields : ["BT HRV"],
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getValues : () => {
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if (lastGetValue + 10000 < Date.now()){
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lastGetValue = Date.now();
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if (rrHistory.length > 0){
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if (rrHistory.length > 1){
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var squaredSum = 0;
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var last = rrHistory[0]
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for (var i = 1; i < rrHistory.length; i++){
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squaredSum += (last - rrHistory[i])*(last - rrHistory[i]);
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last = rrHistory[i];
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}
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hrv = Math.sqrt(squaredSum/rrHistory.length);
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}
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}
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}
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result = [hrv];
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hrv = "";
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rrHistory = [];
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return result;
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},
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start : () => {
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Bangle.on('BTHRM', onHRM);
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if (Bangle.setBTRHMPower) Bangle.setBTHRMPower(1,"recorder");
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},
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stop : () => {
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Bangle.removeListener('BTHRM', onHRM);
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if (Bangle.setBTRHMPower) Bangle.setBTHRMPower(0,"recorder");
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},
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draw : (x,y) => g.setColor((rrHistory.length > 0)?"#00f":"#008").drawImage(atob("DAwBAAAACECECECEDGClacEEAAAA"),x,y)
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};
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}
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})
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