Blood-Flow-Monitoring/code.html at main · shruti062/Blood-Flow-Monitoring · 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>Wearable PPG Blood Flow Monitoring Design</title>
<style>
  @import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&display=swap');
  html, body {
    margin: 0; padding: 0; font-family: 'Montserrat', sans-serif;
    background: linear-gradient(135deg, #2e3c5d, #4a6577);
    color: #f0f0f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  header {
    padding: 1.5rem 1rem;
    text-align: center;
  }
  header h1 {
    margin: 0;
    font-weight: 700;
    font-size: 2.5rem;
    letter-spacing: 1.5px;
  }
  header p {
    font-size: 1.15rem;
    color: #cfd8dc;
    max-width: 660px;
    margin: 0.5rem auto 2rem;
  }
  main {
    max-width: 900px;
    width: 90vw;
    background: #1f2937cc;
    border-radius: 12px;
    padding: 2rem 2.5rem;
    box-shadow: 0 0 20px rgba(45, 68, 92, 0.7);
  }
  section {
    margin-bottom: 2.5rem;
  }
  h2 {
    font-weight: 700;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #4fc3f7;
    display: inline-block;
    padding-bottom: 0.25rem;
    color: #81d4fa;
  }
  p {
    line-height: 1.5;
    font-size: 1.1rem;
    color: #ccd6f6;
  }

  /* Block diagram container */
  #diagram {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    margin-top: 1rem;
  }
  .block {
    background: #1e2733;
    border-radius: 10px;
    padding: 1rem 1.5rem;
    width: 180px;
    text-align: center;
    box-shadow: 0 0 12px #2fc3f7aa;
    margin: 10px;
    position: relative;
    color: #b0cee8;
  }
  .block h3 {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
    color: #81d4fa;
  }
  /* Arrows between blocks */
  .arrow {
    width: 40px;
    height: 2px;
    background: #4fc3f7;
    position: relative;
    align-self: center;
    margin: 0 10px;
  }
  .arrow::after {
    content: '';
    position: absolute;
    right: -8px;
    top: -5px;
    border: 6px solid transparent;
    border-left-color: #4fc3f7;
  }
  #diagram-row {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: nowrap;
    margin-top: 2rem;
  }

  /* Simulation visualization */
  #simulation {
    text-align: center;
    margin-top: 1rem;
  }
  #ppgCanvas {
    background: #0d1a2c;
    border-radius: 12px;
    box-shadow: 0 0 15px #45a1ffaa;
    margin: 1rem auto;
    display: block;
  }
  .slider-container {
    max-width: 400px;
    margin: 1rem auto;
    color: #a6c7ff;
  }
  input[type=range] {
    width: 100%;
    -webkit-appearance: none;
    height: 6px;
    background: #3d5879;
    border-radius: 3px;
    outline: none;
  }
  input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #82c9ff;
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid #4fc3f7;
    margin-top: -7px;
    transition: background 0.3s ease;
  }
  input[type=range]::-webkit-slider-thumb:hover {
    background: #a6d8ff;
  }
  input[type=range]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 10px #82c9ff88;
  }
  label {
    font-weight: 600;
    font-size: 1rem;
    display: block;
    margin-bottom: 0.25rem;
  }

  /* Footer */
  footer {
    margin-top: auto;
    padding: 1rem 0;
    color: #7a8fa3;
    font-size: 0.9rem;
  }
</style>
</head>
<body>

<header>
  <h1>Wearable PPG Blood Flow Monitoring Design</h1>
  <p>Conceptual design and interactive simulation of a wearable non-invasive blood flow monitoring device using a PPG sensor.</p>
</header>

<main>
  <section>
    <h2>Design Overview</h2>
    <p>
      Photoplethysmography (PPG) is an optical technique that measures volumetric changes in blood circulation. A wearable PPG device typically includes a light source (LED) that illuminates the skin
      and a photodetector that measures changes in light absorption caused by pulsatile blood flow.
    </p>
    <p>
      This device design ensures comfort and reliability by integrating flexible sensors positioned on the wrist or finger, with careful
      opto-mechanical alignment of emitter and detector. The signals are then amplified, processed, and analyzed to extract heart rate and blood flow characteristics.
    </p>
  </section>

  <section>
    <h2>Block Diagram</h2>
    <div id="diagram-row" aria-label="Block diagram of wearable PPG device">
      <div class="block" id="block-skin">
        <h3>Skin Tissue</h3>
        <p>Illuminated by LED, light is absorbed & scattered by blood vessels.</p>
      </div>
      <div class="arrow" aria-hidden="true"></div>
      <div class="block" id="block-led">
        <h3>LED (Light Source)</h3>
        <p>Emits green or infrared light into skin.</p>
      </div>
      <div class="arrow" aria-hidden="true"></div>
      <div class="block" id="block-photodetector">
        <h3>Photodetector</h3>
        <p>Detects reflected light intensity modulated by blood volume.</p>
      </div>
      <div class="arrow" aria-hidden="true"></div>
      <div class="block" id="block-signal-processing">
        <h3>Signal Processing Unit</h3>
        <p>Amplifies & filters PPG signals for noise reduction.</p>
      </div>
      <div class="arrow" aria-hidden="true"></div>
      <div class="block" id="block-data-analysis">
        <h3>Data Analysis</h3>
        <p>Extracts heart rate & blood flow info; sends to user interface.</p>
      </div>
    </div>
  </section>

  <section>
    <h2>Interactive PPG Signal Simulation</h2>
    <p>
      Adjust the simulated blood flow pulse amplitude below to see the resulting PPG signal waveform change, mimicking how blood flow affects the sensor reading.
    </p>
    <div id="simulation">
      <canvas id="ppgCanvas" width="850" height="150" aria-label="PPG signal waveform"></canvas>
      <div class="slider-container">
        <label for="pulseAmpl">Pulse Amplitude</label>
        <input type="range" id="pulseAmpl" min="0" max="1" step="0.01" value="0.7" aria-valuemin="0" aria-valuemax="1" aria-valuenow="0.7" aria-label="Pulse amplitude slider" />
      </div>
    </div>
  </section>
</main>

<footer>
  &copy; 2024 Wearable PPG Design & Simulation - Conceptual Prototype
</footer>

<script>
  const canvas = document.getElementById('ppgCanvas');
  const ctx = canvas.getContext('2d');
  const width = canvas.width;
  const height = canvas.height;
  const pulseSlider = document.getElementById('pulseAmpl');

  // Basic sine wave parameters to simulate PPG waveform
  let pulseAmplitude = parseFloat(pulseSlider.value);
  const baseline = height * 0.75;
  const frequency = 1.5; // Hz - approx heart beats per second (90 BPM)
  const sampleRate = 1000; // samples per second
  let time = 0;
  const dt = 1/sampleRate;
  let xScale = width / (sampleRate / frequency);

  function drawBackground() {
    ctx.fillStyle = '#0d1a2c';
    ctx.fillRect(0, 0, width, height);

    // Draw grid lines for timing
    ctx.strokeStyle = '#1e2d4a';
    ctx.lineWidth = 1;
    ctx.beginPath();
    for (let x = 0; x <= width; x += 50) {
      ctx.moveTo(x, 0);
      ctx.lineTo(x, height);
    }
    for (let y = 0; y <= height; y += 30) {
      ctx.moveTo(0, y);
      ctx.lineTo(width, y);
    }
    ctx.stroke();

    // Labels
    ctx.fillStyle = '#4fc3f7';
    ctx.font = '12px Montserrat, sans-serif';
    ctx.fillText('Time →', width - 55, height - 5);
    ctx.fillText('PPG Signal ↓', 5, 15);
  }

  function drawPPGWaveform(amplitude) {
    ctx.lineWidth = 3;
    ctx.strokeStyle = '#82c9ff';
    ctx.beginPath();

    const samples = width;
    for(let i = 0; i < samples; i++) {
      const t = (i / sampleRate);
      // PPG-like waveform: base sinus + pulse + small ripple
      // Using a sharper peak using absolute sine powered
      const pulse = Math.pow(Math.abs(Math.sin(2 * Math.PI * frequency * t)), 3);
      // Ripple simulates micro-oscillations
      const ripple = 0.05 * Math.sin(2 * Math.PI * 20 * t);

      const y = baseline - (amplitude * pulse * 80) - (ripple * 30);
      if(i === 0) {
        ctx.moveTo(i, y);
      } else {
        ctx.lineTo(i, y);
      }
    }
    ctx.stroke();
  }

  function animate() {
    drawBackground();
    drawPPGWaveform(pulseAmplitude);
  }

  pulseSlider.addEventListener('input', (e) => {
    pulseAmplitude = parseFloat(e.target.value);
    animate();
  });

  // Initial draw
  animate();
</script>
</body>
</html>