add base module

apps/smartbatt/module.js

@@ -0,0 +1,112 @@
+{
+  var filename = "smartbattdata.json";
+  var interval;
+  var storage=require("Storage");
+
+  var logFile = "smartbattlog.json";
+
+  function logBatterySample(entry) {
+    let log = storage.readJSON(logFile, 1) || [];
+
+    // Keep it from growing forever (optional: only keep last 100 entries)
+    if (log.length > 100) log.shift();
+
+    log.push(entry);
+    storage.writeJSON(logFile, log);
+  }
+
+
+
+  // Record current battery reading into current average
+  function recordBattery() {
+    let now = Date.now();
+    let data = getData();
+
+    let batt = E.getBattery();
+    let battChange = data.battLastRecorded - batt;
+    let deltaHours = (now - data.timeLastRecorded) / (1000 * 60 * 60);
+    let totalHours=data.totalHours;
+    // Default reason (in case we skip)
+    let reason = "Recorded";
+
+
+    if (battChange <= 0) {
+      reason = "Skipped: battery rose or no change";
+      data.battLastRecorded = batt;
+      storage.writeJSON(filename, data);
+    } else if (deltaHours <= 0 || !isFinite(deltaHours)) {
+      reason = "Skipped: invalid time delta";
+      data.timeLastRecorded = now;
+      data.battLastRecorded = batt;
+      storage.writeJSON(filename, data);
+    } else {
+
+      let currentDrainage = battChange / deltaHours;
+      // Calculate new average
+      let alpha = 0.3; // how "fast" to react (0.1 = slow, 0.5 = fast)
+
+      // Weight alpha by how much time the new reading represents
+      let weight = deltaHours / (deltaHours + 1);
+      let effectiveAlpha = alpha * weight;
+      data.avgBattDrainage = (effectiveAlpha * currentDrainage) + (1 - effectiveAlpha) * data.avgBattDrainage;
+      data.timeLastRecorded = now;
+      data.totalCycles += 1;
+      data.totalHours+=deltaHours;
+      data.battLastRecorded = batt;
+      storage.writeJSON(filename, data);
+
+      reason = "Drainage recorded: " + currentDrainage.toFixed(3) + "%/hr";
+    }
+
+    // Always log the sample
+    logBatterySample({
+      time: now,
+      battNow: batt,
+      battLast: data.battLastRecorded,
+      battChange: battChange,
+      deltaHours: deltaHours,
+      avgDrainage: data.avgBattDrainage,
+      reason: reason
+    });
+  }
+
+
+
+  getData=function() {
+    return storage.readJSON(filename, 1) || {
+      avgBattDrainage: 0,
+      battLastRecorded: E.getBattery(),
+      timeLastRecorded: Date.now(),
+      totalCycles: 0,
+      totalHours:0
+    };
+  }
+
+
+
+  // Estimate hours remaining
+  estimateBatteryLife=function() {
+    let data = getData();
+    var batt = E.getBattery();
+    var hrsLeft = Math.abs(batt / data.avgBattDrainage);
+    return {
+      batt: batt,
+      hrsLeft: hrsLeft,
+    };
+  }
+  
+  deleteData= function(){
+    storage.erase(filename);
+  };
+  // Expose public API
+  exports.record = recordBattery;
+  exports.deleteData = deleteData;
+  exports.get = estimateBatteryLife;
+  exports.changeInterval = function(newInterval) {
+    clearInterval(interval);
+    interval=setInterval(recordBattery, newInterval);
+  };
+  // Start recording every 5 minutes
+  interval=setInterval(recordBattery, 600000);
+  recordBattery(); // Log immediately
+}