health: Settings to turn HRM on

apps.json

@@ -49,7 +49,7 @@
   {
     "id": "health",
     "name": "Health Tracking",
-    "version": "0.02",
+    "version": "0.03",
     "description": "Logs health data and provides an app to view it (BETA - requires firmware 2v11)",
     "icon": "app.png",
     "tags": "tool,system",

apps/health/ChangeLog

@@ -1,2 +1,3 @@
 0.01: New App!
 0.02: Modified data format to include daily summaries
+0.03: Settings to turn HRM on

apps/health/README.md

@@ -14,10 +14,18 @@ To view data, run the `Health` app from your watch.
 
 Stores:
 
-* Heart rate (TODO)
+* Heart rate
 * Step count
 * Movement
 
+## Settings
+
+* **Heart Rt** - Whether to monitor heart rate or not
+  * **Off** - Don't turn HRM on, but record heart rate if the HRM was turned on by another app/widget
+  * **10 Min** - Turn HRM on every 10 minutes (for each heath entry) and turn it off after 2 minutes, or when a good reading is found
+  * **Always** - Keep HRM on all the time (more accurate recording, but reduces battery life to ~36 hours)
+
+
 ## Technical Info
 
 Once installed, the `health.boot.js` hooks onto the `Bangle.health` event and

apps/health/app.js

@@ -1,9 +1,32 @@
+function getSettings() {
+  return require("Storage").readJSON("health.json",1)||{};
+}
+
+function setSettings(s) {
+  require("Storage").writeJSON("health.json",s);
+}
+
 function menuMain() {
   E.showMenu({
     "":{title:"Health Tracking"},
     "< Back":()=>load(),
     "Step Counting":()=>menuStepCount(),
-    "Movement":()=>menuMovement()
+    "Movement":()=>menuMovement(),
+    "Settings":()=>menuSettings()
+  });
+}
+
+function menuSettings() {
+  var s=getSettings();
+  E.showMenu({
+    "":{title:"Health Tracking"},
+    "< Back":()=>load(),
+    "Heart Rt":{
+      value : 0|s.hrm,
+      min : 0, max : 2,
+      format : v=>["Off","10 mins","Always"][v],
+      onchange : v => { s.hrm=v;setSettings(s); }
+    }
   });
 }
 

apps/health/boot.js

@@ -1,3 +1,20 @@
+(function(){
+   var settings = require("Storage").readJSON("health.json",1)||{};
+   var hrm = 0|settings.hrm;
+   Bangle.setHRMPower(hrm!=0, "health");
+   if (hrm==1) {
+     function onHealth() {
+       Bangle.setHRMPower(1, "health");
+       setTimeout(()=>Bangle.setHRMPower(0, "health"),2*60000); // give it 2 minutes
+     }
+     Bangle.on("health", onHealth);
+     Bangle.on('HRM', h => {
+       if (h.confidence>80) Bangle.setHRMPower(0, "health");
+     });
+     onHealth();
+   }
+})();
+
 Bangle.on("health", health => {
   // ensure we write health info for *last* block
   var d = new Date(Date.now() - 590000);