Merge pull request #624 from jabituyaben/master

HRM raw data export app

apps.json

@@ -2536,5 +2536,19 @@
     {"name":"edisonsball.app.js","url":"app.js"},
     {"name":"edisonsball.img","url":"app-icon.js","evaluate":true}
   ]
+},
+{ "id": "hrrawexp",
+  "name": "HRM Data Exporter",
+  "shortName":"HRM Data Exporter",
+  "icon": "app-icon.png",
+  "version":"0.01",
+  "description": "export raw hrm signal data to a csv file",
+  "tags": "",
+  "readme": "README.md",
+  "interface": "interface.html",
+  "storage": [
+    {"name":"hrrawexp.app.js","url":"app.js"},
+    {"name":"hrrawexp.img","url":"app-icon.js","evaluate":true}
+  ]
 }
 ]

apps/hrrawexp/README.md

@@ -0,0 +1,13 @@
+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.
+
+-The app creates a csv file (it's actually just 1 column) and you can download this via My Apps in the App Loader.
+
+-The max time value is 60 minutes.
+
+-The first item holds the data/time when the readings were taken and the file is reset each time the app is run.
+
+-The hrm sensor is sampled @50Hz and this app does not do any processing on it other than clip overly high/extreme values, the array is written as-is. 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:
+https://github.com/jabituyaben/BangleJS-HRM-Signal-Processing

apps/hrrawexp/app-icon.js

@@ -0,0 +1 @@
+E.toArrayBuffer(atob("MDCBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAfwAP4AAD/8A//AAH//D//gAP//n//gAf/////AA/////+AA/////8MA/////4cB/////w+B/////B+B////+D+B////8H+B////4P+B////w/+B/+P/h/+B/+H/D/+A/+D+H/8A//h8P/8A//w4f/8Af/4A//4Af/8B//4AP/+D//wAP//H//wAH/////gAD/////AAB////+AAA////+AAAf///8AAAP///wAAAH///gAAAD///AAAAA//+AAAAAf/4AAAAAH/gAAAAAB+AAAAAAAYAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=="))

apps/hrrawexp/app.js

@@ -0,0 +1,97 @@
+var counter = 1;
+var logging_started;
+var interval;
+var value;
+
+var file = require("Storage").open("hrm_log.csv", "w");
+file.write("");
+
+file = require("Storage").open("hrm_log.csv", "a");
+
+function update_timer() {
+    g.clear();
+    g.setColor("#00ff7f");
+    g.setFont("6x8", 4);
+    g.setFontAlign(0, 0); // center font
+
+    g.drawString(counter, 120, 120);
+    g.setFont("6x8", 2);
+    g.setFontAlign(-1, -1);
+    g.drawString("-", 220, 200);
+    g.drawString("+", 220, 40);
+    g.drawString("GO", 210, 120);
+
+    g.setColor("#ffffff");
+    g.setFontAlign(0, 0); // center font
+    g.drawString("Timer (minutes)", 120, 90);
+
+    g.setFont("6x8", 4); // bitmap font, 8x magnified
+
+    if (!logging_started)
+        g.flip();
+}
+
+function btn1Pressed() {
+    if (!logging_started) {
+        if (counter < 60)
+            counter += 1;
+        else
+            counter = 1;
+        update_timer();
+    }
+}
+
+function btn3Pressed() {
+    if (!logging_started) {
+        if (counter > 1)
+            counter -= 1;
+        else
+            counter = 60;
+        update_timer();
+    }
+}
+
+function btn2Pressed() {
+    launchtime = 0 | getTime();
+    file.write(launchtime + "," + "\n");
+    logging_started = true;
+    counter = counter * 60;
+    interval = setInterval(countDown, 1000);
+    Bangle.setHRMPower(1);
+}
+
+function fmtMSS(e) {
+    var m = Math.floor(e % 3600 / 60).toString().padStart(2, '0'),
+        s = Math.floor(e % 60).toString().padStart(2, '0');
+    return m + ':' + s;
+}
+
+function countDown() {
+    g.clear();
+    counter--;
+    if (counter == 0) {
+        Bangle.setHRMPower(0);
+        clearInterval(interval);
+        g.drawString("Finished", g.getWidth() / 2, g.getHeight() / 2);
+        Bangle.buzz(500, 1);
+    }
+    else
+        g.drawString(fmtMSS(counter), g.getWidth() / 2, g.getHeight() / 2);
+}
+
+update_timer();
+
+setWatch(btn1Pressed, BTN1, { repeat: true });
+setWatch(btn2Pressed, BTN2, { repeat: true });
+setWatch(btn3Pressed, BTN3, { repeat: true });
+
+Bangle.on('HRM', function (hrm) {
+    for (let i = 0; i < hrm.raw.length; i++) {
+        value = hrm.raw[i];
+        if (value < -2)
+            value = -2;
+        if (value > 6)
+            value = 6;
+        file.write(value + "," + "\n");
+    }
+});

apps/hrrawexp/interface.html

@@ -0,0 +1,54 @@
+<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>