mirror of https://github.com/espruino/BangleApps
132 lines
4.0 KiB
JavaScript
132 lines
4.0 KiB
JavaScript
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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function startMeasure() {
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logData = [];
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isMeasuring = true;
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Bangle.setLCDTimeout(0);
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lcdTimeout = setTimeout(() => {
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Bangle.setLCDTimeout(50);
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}, 50000);
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setTimeout(() => {
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Bangle.setHRMPower(1); // starts HRM
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Bangle.on('HRM', handleHeartRate); // Use function handleHeartRate
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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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} // startMeasure
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function stopMeasure() {
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isMeasuring = false;
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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'); //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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} //stopMeasure
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function handleHeartRate(hrm) {
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if (isMeasuring && hrm.confidence > 90) {
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// Build the timestamp
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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 milliseconds = date.getMilliseconds();
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// Concatenate date, time, seconds, & milliseconds
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let timestamp = `${dateStr} ${timeStr}:${seconds}.${milliseconds}`;
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currentHR = hrm.bpm;
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logData.push({ timestamp: timestamp, heartRate: currentHR });
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drawScreen();
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} // if
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} // handleHeartRate
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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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// 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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// Draw the title
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g.setColor('#000000'); // Set text color to black
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g.drawString('Heart Rate Monitor', g.getWidth() / 2, 10);
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if (isMeasuring) {
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// Draw measuring status
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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
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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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g.setFont('6x8', 1.5);
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g.drawString('Press button to stop', g.getWidth() / 2, g.getHeight() / 2 + 42);
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} else {
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// Draw last heart rate
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if (currentHR !== null && currentHR > 0) {
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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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g.setFont('6x8', 4);
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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 + 5);
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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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} // if
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} // if
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// Update the display
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g.flip();
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} // drawScreen
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function saveDataToCSV() {
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let fileName = "phystrax_hrm.csv";
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let file = require("Storage").open(fileName, "a"); // Open the file for appending
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// Check if the file is empty (i.e., newly created)
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if (file.getLength() === 0) {
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// Write the header if the file is empty
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file.write("Timestamp,Heart Rate(bpm)\n");
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} // if
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// Append the data
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logData.forEach(entry => {
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file.write(`${entry.timestamp},${entry.heartRate}\n`);
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});
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}
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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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stopMeasure();
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} // if
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}, BTN1, { repeat: true, edge: 'rising' }); // setWatch
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drawScreen();
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