Simple-Sound-Level-Meter/index.html at main · Samuelson777/Simple-Sound-Level-Meter · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Simple Sound Level Meter</title>
<style>
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #222;
    color: #eee;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    padding: 1rem;
    text-align: center;
  }
  h1 {
    color: #4caf50;
    margin-bottom: 0.5rem;
  }
  #instructions {
    margin-bottom: 1rem;
    max-width: 300px;
  }
  #volumeMeter {
    width: 300px;
    height: 40px;
    background: #444;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1rem;
  }
  #volumeLevel {
    height: 100%;
    width: 0%;
    background: #4caf50;
    transition: width 0.1s ease-out;
  }
  button {
    background: #4caf50;
    color: #222;
    border: none;
    border-radius: 6px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: background-color 0.3s ease;
  }
  button:hover {
    background: #388e3c;
  }
  #status {
    margin-top: 1rem;
    font-style: italic;
    color: #ccc;
  }
</style>
</head>
<body>
  <h1>Simple Sound Level Meter</h1>
  <div id="instructions">Click "Start" and allow microphone access. The green bar shows the sound volume level in real time.</div>
  <div id="volumeMeter" aria-label="Sound volume level meter">
    <div id="volumeLevel"></div>
  </div>
  <button id="startStopBtn">Start</button>
  <div id="status"></div>

<script>
  let audioContext = null;
  let meter = null;
  let rafId = null;
  let microphone = null;
  const volumeLevel = document.getElementById('volumeLevel');
  const status = document.getElementById('status');
  const startStopBtn = document.getElementById('startStopBtn');

  function startMeter() {
    if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
      status.textContent = "getUserMedia is not supported by your browser.";
      return;
    }
    status.textContent = "Requesting microphone access...";
    navigator.mediaDevices.getUserMedia({audio:true})
      .then(stream => {
        audioContext = new (window.AudioContext || window.webkitAudioContext)();
        microphone = audioContext.createMediaStreamSource(stream);

        meter = audioContext.createAnalyser();
        meter.fftSize = 256;
        microphone.connect(meter);

        status.textContent = "Microphone access granted. Sound level active.";
        startVisualizing();
      })
      .catch(err => {
        status.textContent = "Microphone access denied or error: " + err.message;
      });
  }

  function startVisualizing() {
    if (!meter) return;

    const dataArray = new Uint8Array(meter.frequencyBinCount);

    function update() {
      meter.getByteFrequencyData(dataArray);
      // Calculate average volume
      let sum = 0;
      for (let i = 0; i < dataArray.length; i++) {
        sum += dataArray[i];
      }
      const avg = sum / dataArray.length;
      const percent = Math.min(100, (avg / 255) * 100);
      volumeLevel.style.width = percent + '%';
      rafId = requestAnimationFrame(update);
    }
    update();
  }

  function stopMeter() {
    if (rafId) {
      cancelAnimationFrame(rafId);
      rafId = null;
    }
    if (microphone) {
      microphone.disconnect();
      microphone = null;
    }
    if (audioContext) {
      audioContext.close();
      audioContext = null;
    }
    volumeLevel.style.width = '0%';
    status.textContent = 'Sound meter stopped.';
  }

  startStopBtn.addEventListener('click', () => {
    if (startStopBtn.textContent === 'Start') {
      startMeter();
      startStopBtn.textContent = 'Stop';
    } else {
      stopMeter();
      startStopBtn.textContent = 'Start';
    }
  });
</script>
</body>
</html>