Merge pull request #2550 from notEvil/chargent

chargent: added threshold

apps/chargent/ChangeLog

@@ -1,2 +1,3 @@
 0.01: First version
 0.02: Support BangleJS2
+0.03: Added threshold

apps/chargent/README.md

@@ -6,6 +6,8 @@ The first stage of charging Li-ion ends at ~80% capacity when the charge voltage
 
 This app has no UI and no configuration. To disable the app, you have to uninstall it.
 
+New in v0.03: before the very first buzz, the average value after the peak is written to chargent.json and used as threshold for future charges. This reduces the time spent in the second charge stage.
+
 Side notes
 - Full capacity is reached after charge current drops to an insignificant level. This is quite some time after charge voltage reached its peak / `E.getBattery()` returns 100.
 - This app starts buzzing some time after `E.getBattery()` returns 100 (~15min on my watch), and at least 5min after the peak to account for noise.

apps/chargent/boot.js

@@ -6,19 +6,27 @@
     if (charging) {
       if (!id) {
         var max = 0;
-        var count = 0;
+        var cnt = 0;
+        var sum = 0;
+        var lim = (require('Storage').readJSON('chargent.json', true) || {}).limit || 0;
         id = setInterval(() => {
-          var battlvl = analogRead(pin);
-          if (max < battlvl) {
-            max = battlvl;
-            count = 0;
+          var val = analogRead(pin);
+          if (max < val) {
+            max = val;
+            cnt = 1;
+            sum = val;
           } else {
-            count++;
-            if (10 <= count) {  // 10 * 30s == 5 min  // TODO ? customizable
-              // TODO ? customizable
-              Bangle.buzz(500);
-              setTimeout(() => Bangle.buzz(500), 1000);
+            cnt++;
+            sum += val;
+          }
+          if (10 < cnt || (lim && lim <= max)) {  // 10 * 30s == 5 min  // TODO ? customizable
+            if (!lim) {
+              lim = sum / cnt;
+              require('Storage').writeJSON('chargent.json', {limit: lim});
             }
+            // TODO ? customizable
+            Bangle.buzz(500);
+            setTimeout(() => Bangle.buzz(500), 1000);
           }
         }, 30*1000);
       }

apps/chargent/metadata.json

@@ -1,6 +1,6 @@
 { "id": "chargent",
   "name": "Charge Gently",
-  "version": "0.02",
+  "version": "0.03",
   "description": "When charging, reminds you to disconnect the watch to prolong battery life.",
   "icon": "icon.png",
   "type": "bootloader",
@@ -9,5 +9,8 @@
   "readme": "README.md",
   "storage": [
     {"name": "chargent.boot.js", "url": "boot.js"}
+  ],
+  "data": [
+    {"name": "chargent.json"}
   ]
 }