Added hrmtest app to try out different LED intensities etc.

apps/hrmtest/ChangeLog

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+0.01: New App!
+0.02: Fixes
+0.03: updated to work with new API and additional features added such as longer recording time and additional filtered data
+0.04: added support for bangle.js 2
+0.05: Added time to output file, reallocated BTN1 to start timer.
+0.06: Created hrmtestapp based on hrrawexp

apps/hrmtest/README.md

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+Extract hrm raw signal data to CSV file
+=======================================
+
+Simple app that will run the heart rate monitor for a defined period of time you set at the start and record data to a csv file.
+
+Updated to work with new API and includes support for Bangle.js 2. Additional capability includes:
+
+1. Now also records upto 2 hours - if you cancel at any time the CSV file will still be there, the timer you set at the start is more so that you get an alert when it's complete.
+2. Along with raw PPG readings, it also records bandpassed filtered data in a second column, available in the new API.
+3. Rather than overwriting 1 data file, the app will record upto 5 files before recording to a generic data file as a fallback if all 5 allocated files remain on the watch storage. The limit is in place to avoid going over storage limits as these files can get large over time.
+
+-The hrm sensor is sampled @50Hz on the Bangle.JS 1 and 25Hz on the Bangle 2 by default. At least on the Bangle 2 you can change the sample rate by using the 'custom boot code' app and running this line:
+Bangle.setOptions({hrmPollInterval:20});­
+
+the 20 in the boot code means the hrm will poll every 20ms (50Hz) instead of the default 40. 
+
+4. On the bangle.JS 2 you can swipe up to begin recording, and on the Bangle.JS 1 you just use the top button.
+
+For Bangle 1, there is an example Python script that can process this signal, smooth it and also extract a myriad of heart rate variability metrics using the hrvanalysis library. I will be working on a method for Bangle 2 because the data seems more noisy so will need a different processing method:
+https://github.com/jabituyaben/BangleJS-HRM-Signal-Processing

apps/hrmtest/app.js

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+/**
+ * HRM Test - An app to test various HRM sensor configuration options, and save HRM data
+ * to a file for offline analysis.
+ * It initially starts the hrm using default settings and updates the display whenever
+ * raw HRM data is received.
+ * Swiping the screen changes the LED power.
+ * Pressing the button stops the HRM.
+ * The top third of the screen shows the HRM parameters, including calculaed bpm.
+ * The lower two thirds is a graph of raw HRM readings.
+ * Graham Jones, 2023, based on official BangleJS hrrawexp app
+ */
+
+var counter = 15;
+var logging_started;
+var interval;
+var value;
+var filt;
+
+var fileClosed = 0;
+var Storage = require("Storage");
+var file;
+
+var screenSize = g.getHeight();
+var screenH = g.getHeight();
+var screenW = g.getWidth();
+var textOriginY = 0;
+var textOriginX = 0;
+var textW = screenW;
+var textH = screenH/3;
+var graphOriginX = 0;
+var graphOriginY = textOriginY + textH + 1;
+var graphH = screenH - textH;
+var graphW = screenW;
+
+var HRVal = 0;          // latest HRM readings
+var HRConfidence = 0;
+var rawVals = [];     // Raw values read by i2c
+var algVals = [];     // Raw values read from analogue pin.
+var rawBufSize = screenW;
+
+var ledCurrentVals = [0x30, 0x50, 0x5A, 0xE0];
+var ledCurrentIdx = 0;
+
+var slot0LedCurrentVal = 15;  //64
+
+
+
+function fileExists(fName){
+  /**
+   * Returns true if a file named by the string parameter fName exists in storage, or else 
+   * returns false
+   */
+  s = require('Storage');
+  var fileList = s.list();
+  var fileExists = false;
+  for (let i = 0; i < fileList.length; i++) {
+        fileExists = fileList[i].includes(fName);
+        if(fileExists){
+          break;
+        }
+  }
+  return fileExists;
+}
+
+function drawText() {
+  //g.clear();
+  g.clearRect(textOriginX,textOriginY,textW,textH);
+  g.setColor("#CC00CC");
+  g.setFontAlign(-1, -1, 0); // top left origin
+
+  y = textOriginY;
+  g.setFont("6x8", 3);
+  g.drawString(HRVal, textOriginX, y);
+  g.setFont("6x8", 2);
+  g.drawString(HRConfidence+"%", textOriginX+70, y);
+  g.setFont("6x8", 2);
+  if (logging_started) {
+    g.drawString("RUN", textOriginX+115, y);
+  } else {
+    g.drawString("STOP", textOriginX+115, y);
+  }
+
+  y = y + 28;
+  g.setFont("6x8", 3);
+  g.drawString(slot0LedCurrentVal, textOriginX + 0, y);
+  g.drawString(ledCurrentIdx, textOriginX + 70, y);
+  g.drawString(rawVals.length, textOriginX + 130, y);
+
+  g.setFont("6x8", 2);
+  //g.setFontAlign(-1, -1);
+  g.drawString("+", screenSize-10, screenSize/2);
+  g.drawString("-", 10, screenSize/2);
+  g.drawString("GO",screenSize/2 , (screenSize/2)+(screenSize/5));
+  //g.setColor("#ffffff");
+  //g.setFontAlign(0, 0); // center font
+  g.setFont("6x8", 4);
+  g.drawString("^",screenSize/2 , 150);
+
+  drawGraph();
+  g.flip();
+}
+
+
+function drawGraph() {
+  //g.clear();
+  g.clearRect(graphOriginX,graphOriginY,graphOriginX + graphW, graphOriginY + graphH);
+  var minVal = rawVals[0];
+  var maxVal = minVal;
+  for (var i=0;i<rawVals.length; i++) {
+    if (rawVals[i]<minVal) minVal = rawVals[i];
+    if (rawVals[i]>maxVal) maxVal = rawVals[i];
+  }
+  var yMin = screenH;
+  var yMax = graphOriginY;
+  console.log("drawGraph() - minVal="+minVal+", maxVal="+maxVal);
+  for (var i=0;i<rawVals.length-1; i++) {
+    var y = yMin + (rawVals[i]-minVal)*(yMax-yMin)/(maxVal-minVal);
+    g.drawRect(i,yMin,i+1,y);
+  }
+}
+
+function setLedCurrent() {
+  console.log("setLedCurrent()");
+  Bangle.hrmWr(0x17,slot0LedCurrentVal);
+  //Bangle.hrmWr(0x19, ledCurrentVals[ledCurrentIdx]);
+}
+
+function changeLedCurrent(changeVal) {
+  // Update the requested ledCurrent by changing its index by changeVal
+  // Wraps around to the ends of ledCurrentVals if index is out of range.
+  ledCurrentIdx += changeVal;
+  if (ledCurrentIdx > ledCurrentVals.length -1 ) {
+    ledCurrentIdx = 0;
+  }
+  if (ledCurrentIdx < 0) {
+    ledCurrentIdx = ledCurrentVals.length -1;
+  }
+  setLedCurrent();
+  drawText();
+}
+
+function changeSlot0Current(changeVal) {
+  // Update the requested slot0Current by changing it
+  // Wraps around to the upper or lower limit if it is out of range.
+  slot0LedCurrentVal += changeVal;
+  if (slot0LedCurrentVal > 0xef) {
+    slot0LedCurrentVal = 0;
+  }
+  if (slot0LedCurrentVal < 0) {
+    slot0LedCurrentVal = 0xef;
+  }
+  setLedCurrent();
+  drawText();
+}
+
+function initialiseHrm() {
+  Bangle.setHRMPower(1);
+  Bangle.setOptions({
+    hrmGreenAdjust: false
+  });
+  setLedCurrent();
+
+}
+
+function startStopHrm() {
+  if (!logging_started) {
+    console.log("startStopHrm - starting");
+    var filename = "";
+    var fileset = false;
+
+    for (let i = 0; i < 5; i++) {
+      filename = "HRM_data" + i.toString() + ".csv";
+      if(fileExists(filename) == 0){
+        file = require("Storage").open(filename,"w");
+        console.log("creating new file " + filename);
+        fileset = true;
+      }
+      if(fileset){
+        break;
+      }
+    }
+
+    if (!fileset){
+      console.log("overwiting file");
+      file = require("Storage").open("HRM_data.csv","w");
+    }
+
+    file.write("");
+    file = require("Storage").open(filename,"a");
+
+    //launchtime = 0 | getTime();
+    //file.write(launchtime + "," + "\n");
+    logging_started = true;
+    counter = counter * 60;
+    interval = setInterval(countDownTimerCallback, 1000);
+
+    initialiseHrm();
+
+  } else {
+    console.log("startStopHrm - stopping");
+    Bangle.setHRMPower(0);
+    clearInterval(interval);
+    g.drawString("Done", g.getWidth() / 2, g.getHeight() / 2);
+    Bangle.buzz(500, 1);
+    fileClosed = 1;
+    logging_started = false;
+
+  }
+}
+
+function fmtMSS(e) {
+    h = Math.floor(e / 3600);
+    e %= 3600;
+    m = Math.floor(e / 60);
+    s = e % 60;
+    return h + ":" +  m + ':' + s;
+}
+
+function countDownTimerCallback() {
+  /**
+   * Called once per second by timer 'interval'
+   */
+  drawText();
+}
+
+///////////////////////////////////////
+// Main Program 
+console.log("Registering button callback");
+setWatch(startStopHrm, BTN1, { repeat: true });
+//setWatch(btn2Pressed, BTN2, { repeat: true });
+//setWatch(btn3Pressed, BTN3, { repeat: true });
+
+console.log("Registering swipe callback");
+Bangle.on("swipe",function(directionLR, directionUD){
+    if (1==directionLR){
+        changeLedCurrent(1);
+    }
+   else if(directionLR == -1){
+        changeLedCurrent(-1);
+     }
+    else if (directionUD ==1){
+      changeSlot0Current(5);
+    }
+    else if (directionUD == -1) {
+      changeSlot0Current(-5);
+    }
+  });
+
+console.log("Registering raw hrm data callback");
+Bangle.on('HRM-raw', function (hrm) {
+        value = hrm.raw;
+        filt = hrm.filt;
+        let alg = Math.round(analogRead(29)* 16383);
+        rawVals.push(alg); // FIXME - pushing analogue value for testing
+        //algVals.push(alg)
+        if (rawVals.length > rawBufSize) {
+          rawVals.shift();
+          //algVals.shift();
+        }
+        //var dataArray = [value,filt,HRVal,HRConfidence];
+        file.write(getTime() + "," + value + "," + filt 
+                + "," + HRVal + "," + HRConfidence + "\n");
+});
+
+console.log("Registering hrm values callback");
+Bangle.on('HRM', function (hrmB) {
+        HRVal = hrmB.bpm;
+        HRConfidence = hrmB.confidence;
+});
+
+drawText();
+
+
+

apps/hrmtest/interface.html

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+<html>
+  <head>
+    <link rel="stylesheet" href="../../css/spectre.min.css">
+  </head>
+  <body>
+    <div id="data"></div>
+    <button class="btn btn-default" id="btnSave">Save</button>
+    <button class="btn btn-default" id="btnDelete">Delete</button>
+
+    <script src="../../core/lib/interface.js"></script>
+    <script>
+var dataElement = document.getElementById("data");
+var csvData = "";
+
+function getData() {
+  // show loading window
+  Util.showModal("Loading...");
+  // get the data
+  dataElement.innerHTML = "";
+  Util.readStorageFile(`hrm_log.csv`,data=>{
+    csvData = data.trim();
+    // remove window
+    Util.hideModal();
+    // If no data, report it and exit
+    if (data.length==0) {
+      dataElement.innerHTML = "<b>No data found</b>";
+      return;
+    }
+    else{
+      dataElement.innerHTML = "<b>data file found</b>";
+      return;
+    }
+  });
+}
+
+// You can call a utility function to save the data
+document.getElementById("btnSave").addEventListener("click", function() {
+  Util.saveCSV("HRM_data", csvData);
+});
+// Or you can also delete the file
+document.getElementById("btnDelete").addEventListener("click", function() {
+  Util.showModal("Deleting...");
+  Util.eraseStorageFile("hrm_log.csv", function() {
+    Util.hideModal();
+    getData();
+  });
+});
+// Called when app starts
+function onInit() {
+  getData();
+}
+    </script>
+  </body>
+</html>

apps/hrmtest/metadata.json

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+{
+  "id": "hrmtest",
+  "name": "HRM Sensor Test",
+  "shortName": "HRM_Test",
+  "version": "0.06",
+  "description": "Test various HRM configuration options",
+  "icon": "app-icon.png",
+  "tags": "",
+  "readme": "README.md",
+  "interface": "interface.html",
+  "supports": ["BANGLEJS","BANGLEJS2"],
+  "storage": [
+    {"name":"hrmtest.app.js","url":"app.js"},
+    {"name":"hrmtest.img","url":"app-icon.js","evaluate":true}
+  ]
+}