forked from FOSS/BangleApps
edited app.js
Elfreda Kwawu
parent
27d745f1cc
commit
8fd8cf56ea
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@ -1,15 +1,10 @@
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var isMeasuring = false;
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var currentHeartRate = null;
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var lcdTimeout;
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var bpmValues = [];
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var logData = [];
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var lastHeartRateLogTimestamp = 0;
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let isMeasuring = false;
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let currentHR = null;
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let lcdTimeout;
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let logData = [];
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let bpmValues = [];
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let lastLogTime = 0;
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// HRV calculation variables
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var hrvSlots = [10, 20, 30, 60, 120, 300];
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var hrvValues = {};
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// Heart rate monitor functions
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function startMeasure() {
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isMeasuring = true;
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Bangle.setLCDTimeout(0);
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@ -18,9 +13,9 @@ function startMeasure() {
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}, 50000);
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setTimeout(() => {
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Bangle.setHRMPower(1);
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Bangle.setHRMPower(1); // starts HRM
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Bangle.on('HRM', handleHeartRate);
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Bangle.buzz(500, 20);
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Bangle.buzz(200, 10); // Buzz to indicate measurement start
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drawScreen();
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}, 500);
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}
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@ -30,23 +25,76 @@ function stopMeasure() {
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clearTimeout(lcdTimeout);
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Bangle.setLCDTimeout(10);
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Bangle.setHRMPower(0);
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Bangle.removeAllListeners('HRM');
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Bangle.buzz(500, 20);
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Bangle.removeAllListeners('HRM'); //stop HRM
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saveDataToCSV(); // Save data to CSV when measurement stops
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Bangle.buzz(200, 10); // Buzz to indicate measurement stop
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drawScreen();
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}
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function handleHeartRate(hrm) {
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if (hrm.confidence > 90) {
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currentHR = hrm.bpm;
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let currentTime = Date.now();
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let elaspedTime = currentTime - lastLogTime;
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let nextLog = 5 * 1000 - (elaspedTime % (5 * 1000)); // Calculate time to next log
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if (elaspedTime >= 5 * 1000) { // Check if it's time for the next log
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lastLogTime = currentTime - (elaspedTime % (5 * 1000)); // Set last log time to the previous 5-second boundary
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let date = new Date(lastLogTime);
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let dateStr = require("locale").date(date);
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let timeStr = require("locale").time(date, 1);
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let seconds = date.getSeconds();
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let timestamp = `${dateStr} ${timeStr}:${seconds}`; // Concatenate date, time, and seconds
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logData.push({ timestamp: timestamp, heartRate: currentHR });
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bpmValues.push(currentHR); // Store heart rate for HRV calculation
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if (bpmValues.length > 30) bpmValues.shift(); // Keep last 30 heart rate values
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// Calculate and add SDNN (standard deviation of NN intervals) to the last log entry
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logData[logData.length - 1].hrv = calcSDNN();
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drawScreen();
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}
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// Schedule next measurement
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setTimeout(() => {
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handleHeartRate(hrm);
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}, nextLog);
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}
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}
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function calcSDNN() {
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if (bpmValues.length < 5) return 0; // No calculation if insufficient data
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// Calculate differences between adjacent heart rate values
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const differences = [];
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for (let i = 1; i < bpmValues.length; i++) {
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differences.push(Math.abs(bpmValues[i] - bpmValues[i - 1]));
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}
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// Calculate mean difference
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const meanDifference = differences.reduce((acc, val) => acc + val, 0) / differences.length;
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// Calculate squared differences from mean difference
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const squaredDifferences = differences.map(diff => Math.pow(diff - meanDifference, 2));
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// Calculate mean squared difference
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const meanSquaredDifference = squaredDifferences.reduce((acc, val) => acc + val, 0) / squaredDifferences.length;
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// Calculate SDNN (standard deviation of NN intervals)
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const sdnn = Math.sqrt(meanSquaredDifference);
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return sdnn;
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}
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function drawScreen(message) {
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g.clear(); // Clear the display
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// Set the background color
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g.setColor('#95E7FF');
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g.setColor('#95E7FF');
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// Fill the entire display with the background color
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g.fillRect(0, 0, g.getWidth(), g.getHeight());
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// Set font and alignment for drawing text
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g.setFontAlign(0, 0);
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g.setFont('Vector', 15);
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g.setFont('Vector', 15);
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// Draw the title
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g.setColor('#000000'); // Set text color to black
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@ -57,12 +105,13 @@ function drawScreen(message) {
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g.setFont('6x8', 2);
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g.drawString('Measuring...', g.getWidth() / 2, g.getHeight() / 2 - 10);
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// Draw current heart rate if available and not zero
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if (currentHeartRate !== null && currentHeartRate > 0) {
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g.setFont('6x8', 4);
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g.drawString(currentHeartRate.toString(), g.getWidth() / 2, g.getHeight() / 2 + 20);
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// Draw current heart rate if available
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g.setFont('6x8', 4);
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if (currentHR !== null) {
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g.drawString(currentHR.toString(), g.getWidth() / 2, g.getHeight() / 2 + 20);
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g.setFont('6x8', 1.6);
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g.drawString(' BPM', g.getWidth() / 2 + 42, g.getHeight() / 2 + 20);
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}
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// Draw instructions
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@ -72,16 +121,17 @@ function drawScreen(message) {
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// Draw last heart rate
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g.setFont('Vector', 12);
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g.drawString('Last Heart Rate:', g.getWidth() / 2, g.getHeight() / 2 - 20);
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if (currentHeartRate !== null && currentHeartRate > 0) {
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if (currentHR !== null && currentHR > 0) {
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g.setFont('6x8', 4);
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g.drawString(currentHeartRate.toString(), g.getWidth() / 2, g.getHeight() / 2 + 10);
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g.drawString(currentHR.toString(), g.getWidth() / 2, g.getHeight() / 2 + 10);
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g.setFont('6x8', 1.6);
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g.drawString(' BPM', g.getWidth() / 2 + 42, g.getHeight() / 2 + 12);
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} else {
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g.setFont('6x8', 2);
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g.drawString('No data', g.getWidth() / 2, g.getHeight() / 2 + 10);
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g.setFont('6x8', 1);
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g.drawString(message || 'Press button to start!', g.getWidth() / 2, g.getHeight() / 2 + 30);
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g.drawString(message || 'Press button to start', g.getWidth() / 2, g.getHeight() / 2 + 30);
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}
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}
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@ -90,78 +140,14 @@ function drawScreen(message) {
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}
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function saveDataToCSV() {
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let date = new Date();
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let dateStr = require("locale").date(date);
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let timeStr = require("locale").time(date, 1);
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let seconds = date.getSeconds();
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let timestamp = `${dateStr} ${timeStr}:${seconds}`;
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// Check if 10 seconds have passed since the last heart rate log
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if (date.getTime() - lastHeartRateLogTimestamp >= 10 * 1000) {
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logData.push({ timestamp: timestamp, heartRate: currentHeartRate });
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lastHeartRateLogTimestamp = date.getTime(); // Update the last heart rate log timestamp
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// Log data to CSV
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let csvContent = "Timestamp,Heart Rate,HRV (ms)\n";
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logData.forEach(entry => {
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if (entry.heartRate > 0) {
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let hrv = hrvValues[entry.timestamp] || ""; // Get HRV value for the timestamp
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csvContent += `${entry.timestamp},${entry.heartRate},${hrv}\n`;
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}
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});
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require("Storage").write("heart_rate_data.csv", csvContent);
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}
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}
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function handleHeartRate(hrm) {
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if (isMeasuring) {
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currentHeartRate = hrm.bpm;
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drawScreen();
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// Log data to CSV
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saveDataToCSV();
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// Estimate RR intervals
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let rrIntervals = estimateRRIntervals(bpmValues);
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// Calculate HRV
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calculateHRV(rrIntervals);
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}
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}
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function estimateRRIntervals(rawData) {
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let rrIntervals = [];
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for (let i = 1; i < rawData.length; i++) {
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let rrInterval = rawData[i] - rawData[i - 1];
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rrIntervals.push(rrInterval);
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}
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return rrIntervals;
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}
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function calculateHRV(rawData) {
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// Calculate HRV with SDNN method for each slot in hrvSlots
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let sdnn = calcSDNN(rawData);
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hrvValues[Date.now()] = sdnn; // Store HRV value with current timestamp
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// Log HRV data if 5 minutes have elapsed
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if (Date.now() - lastHeartRateLogTimestamp >= 5 * 60 * 1000) {
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console.log("Recalculating HRV...");
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saveDataToCSV(); // Save both heart rate and HRV data to the CSV file
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lastHeartRateLogTimestamp = Date.now(); // Update the timestamp
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}
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}
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function calcSDNN(rrIntervals) {
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let sumOfDifferencesSquared = 0;
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let meanRRInterval = rrIntervals.reduce((acc, val) => acc + val, 0) / rrIntervals.length;
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rrIntervals.forEach(rr => {
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sumOfDifferencesSquared += Math.pow(rr - meanRRInterval, 2);
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let csvContent = "Timestamp,Heart Rate(bpm),HRV(ms)\n";
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logData.forEach(entry => {
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csvContent += `${entry.timestamp},${entry.heartRate},${entry.hrv}\n`;
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});
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let meanOfDifferencesSquared = sumOfDifferencesSquared / (rrIntervals.length - 1);
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return Math.sqrt(meanOfDifferencesSquared);
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require("Storage").write("heart_rate_data.csv", csvContent);
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}
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setWatch(function () {
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setWatch(function() {
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if (!isMeasuring) {
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startMeasure();
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} else {
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