does not work, but tired

.gitignore

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+node_modules
+.DS_Store

.travis.yml

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+language: node_js
+node_js:
+  - 0.10

index.js

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+var EventEmitter = require('events').EventEmitter;
+var now = require('microtime').now;
+
+module.exports =
+function FrequencyMeter(targetInterval) {
+  if (! targetInterval) targetInterval = 1000;
+
+  var count = 0;
+  var maxCount = 10;
+  var start = now();
+  var frequency = 0;
+  var period = targetInterval;
+  var timeout;
+
+  var ee = new EventEmitter();
+
+  ee.happened =
+  function happened() {
+    count ++;
+    if (count == maxCount) cycle();
+  };
+
+  ee.end =
+  function end() {
+    clearTimeout(timeout);
+  };
+
+  schedule();
+
+  return ee;
+
+  //// ------
+
+  function cycle(fromTimeout) {
+    clearTimeout(timeout);
+    var t = now();
+    period = (t - start) / 1000;
+    if (fromTimeout) period = period / 2;
+
+    if (count === 0) {
+      frequency = 0;
+      period = targetInterval / 2;
+    } else {
+      frequency = (period / 1000) / count;
+    }
+
+    schedule();
+
+    ee.emit('frequency', frequency);
+
+    count = 0;
+    start = t;
+  }
+
+  function schedule() {
+    timeout = setTimeout(cycle, period * 2, true);
+  }
+
+}

package.json

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+{
+  "name": "frequency-meter",
+  "version": "0.0.1",
+  "description": "Measures event frequency",
+  "main": "index.js",
+  "scripts": {
+    "test": "node test/meter.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:pgte/frequency-meter.git"
+  },
+  "dependencies": {
+    "microtime": "*"
+  },
+  "devDependencies": {
+    "tap": "*"
+  },
+  "keywords": [
+    "frequency",
+    "measure",
+    "event"
+  ],
+  "author": "pgte",
+  "license": "MIT"
+}

tests/meter.js

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+var test = require('tap').test;
+var Meter = require('..');
+
+test('emits 0 when no activity', function(t) {
+  t.plan(10);
+  var m = Meter(100);
+  var count = 0;
+
+  m.on('frequency', function(f) {
+    console.log('f:', f);
+    count ++;
+    t.strictEqual(f, 0);
+    if (count == 10) {
+      console.log('endindind');
+      m.end();
+    }
+  });
+});