CODE of ANIMATION to be STUDIED (Create by CLAUDE): SISTEM ENCODER MOTOR - INTERAKTIF (PURE JS) aka Ilustrasi visual sederhana/diagram blok atau skema sensor pada motor listrik untuk menunjukkan bagaimana pengukuran kecepatan sudut dilakukan dalam sistem servo/stepper

Sistem Encoder Motor

Poros Motor

Disk Encoder (berlubang)

⚡

LED

👁️

Sensor Photo/IR

Proses Perhitungan

Pulsa ON/OFF

0

→

Δθ (rad)

0.000

÷

Δt (detik)

0.000

=

ω (rad/s)

0

Cara Kerja:

• LED memancarkan cahaya ke sensor melalui disk.
• Saat lubang lewat, cahaya terdeteksi → Pulsa ON.
• Saat bagian padat lewat, cahaya terblokir → Pulsa OFF.
• Setiap pulsa = perubahan sudut (Δθ).
• Kecepatan sudut (ω) = Δθ / Δt.

---

SOURCE-CODE

<!--===============================-->
<!--SISTEM ENCODER MOTOR - INTERAKTIF (PURE JS)-->
<!--===============================-->

<style>
  .encoder-root {
    width: 100%;
    min-height: 100vh;
    box-sizing: border-box;
    background: linear-gradient(to bottom right, #0f172a, #1e293b);
    padding: 40px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: Arial, Helvetica, sans-serif;
    color: #e5e7eb;
  }

  .encoder-title {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 32px;
    text-align: center;
  }

  .encoder-label-blue {
    color: #60a5fa;
    font-weight: 600;
    margin-bottom: 8px;
  }

  .encoder-label-green {
    color: #34d399;
    font-weight: 600;
    margin-bottom: 12px;
  }

  .encoder-shaft {
    width: 8px;
    height: 70px;
    background: linear-gradient(#4b5563, #9ca3af);
    margin: 0 auto;
  }

  .encoder-disk-wrapper {
    text-align: center;
    margin-top: 20px;
  }

  .encoder-disk {
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: linear-gradient(to bottom right, #4b5563, #6b7280);
    border: 5px solid #6b7280;
    position: relative;
    box-shadow: 0 0 30px rgba(0,0,0,0.4);
    margin: 0 auto;
    transition: transform 0.016s linear;
  }

  .encoder-center {
    width: 35px;
    height: 35px;
    background: #1f2937;
    border-radius: 50%;
    border: 2px solid #4b5563;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }

  .encoder-hole {
    width: 22px;
    height: 22px;
    background: #020617;
    border-radius: 50%;
    border: 1px solid #111827;
    position: absolute;
    transform: translate(-50%, -50%);
  }

  .encoder-row-led-sensor {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-top: 24px;
  }

  .encoder-icon-label {
    text-align: center;
  }

  .encoder-icon {
    font-size: 28px;
    margin-bottom: 4px;
    transition: transform 0.2s;
  }

  .encoder-led-active { color:#facc15; animation:encoder-pulse 0.8s infinite; }
  .encoder-led-inactive { color:#f59e0b; }
  .encoder-sensor-active { color:#22d3ee; }
  .encoder-sensor-inactive { color:#0e7490; }

  .encoder-beam {
    width: 120px;
    height: 4px;
    background: linear-gradient(to right,#facc15,#fb923c);
    opacity: 0.6;
  }

  .encoder-button {
    margin-top: 30px;
    padding: 12px 28px;
    border-radius: 10px;
    border:none;
    font-weight:bold;
    font-size:18px;
    color:#ffffff;
    cursor:pointer;
    box-shadow:0 5px 15px rgba(0,0,0,0.4);
    transition: transform 0.1s, background 0.15s;
  }

  .encoder-button:active { transform:scale(0.96); }
  .encoder-button-start { background:#16a34a; }
  .encoder-button-start:hover { background:#15803d; }
  .encoder-button-stop { background:#dc2626; }
  .encoder-button-stop:hover { background:#b91c1c; }

  .encoder-panel {
    margin-top:40px;
    background:#1e293b;
    border:1px solid #334155;
    border-radius:12px;
    padding:25px;
    width:100%;
    max-width:550px;
    text-align:center;
  }

  .encoder-panel-title {
    font-size:22px;
    font-weight:bold;
    margin-bottom:20px;
  }

  .encoder-flow-row {
    display:flex;
    justify-content:center;
    align-items:center;
    gap:20px;
    flex-wrap:wrap;
  }

  .encoder-flow-label { font-size:13px; color:#94a3b8; }
  .encoder-flow-value {
    font-family:"Courier New", monospace;
    font-weight:bold;
    font-size:26px;
  }

  .encoder-flow-arrow { font-size:26px; color:#64748b; }

  .encoder-value-pulse { color:#34d399; }
  .encoder-value-theta { color:#60a5fa; }
  .encoder-value-dt { color:#c084fc; }
  .encoder-value-omega { color:#facc15; font-size:32px; }

  .encoder-infobox {
    margin-top:25px;
    background:rgba(30,64,175,0.4);
    border-radius:12px;
    padding:20px;
    max-width:550px;
    color:#bfdbfe;
    font-size:14px;
  }

  .encoder-infobox ul {
    margin-top:10px;
    padding-left:20px;
    line-height:1.6;
  }

  @keyframes encoder-pulse {
    0% { transform:scale(1); opacity:1; }
    50% { transform:scale(1.15); opacity:0.7; }
    100% { transform:scale(1); opacity:1; }
  }
</style>

<div class="encoder-root" id="encoder-app">
  <h1 class="encoder-title">Sistem Encoder Motor</h1>

  <!--Poros Motor-->
  <div style="margin-bottom:20px; text-align:center;">
    <div class="encoder-label-blue">Poros Motor</div>
    <div class="encoder-shaft"></div>
  </div>

  <!--Disk Encoder-->
  <div class="encoder-disk-wrapper">
    <div class="encoder-label-green">Disk Encoder (berlubang)</div>
    <div class="encoder-disk" id="encoder-disk">
      <div class="encoder-center"></div>
      <!--Lubang akan diisi via JavaScript-->
    </div>
  </div>

  <!--LED & Sensor-->
  <div class="encoder-row-led-sensor">
    <div class="encoder-icon-label">
      <div class="encoder-icon encoder-led-inactive" id="encoder-led">⚡</div>
      <div style="color:#facc15; font-weight:600;">LED</div>
    </div>

    <div class="encoder-beam"></div>

    <div class="encoder-icon-label">
      <div class="encoder-icon encoder-sensor-inactive" id="encoder-sensor">👁️</div>
      <div style="color:#22d3ee; font-weight:600;">Sensor Photo/IR</div>
    </div>
  </div>

  <!--Button-->
  <button class="encoder-button encoder-button-start" id="encoder-button">
    START Motor
  </button>

  <!--Panel Proses Perhitungan-->
  <div class="encoder-panel">
    <div class="encoder-panel-title">Proses Perhitungan</div>

    <div class="encoder-flow-row">
      <div>
        <div class="encoder-flow-label">Pulsa ON/OFF</div>
        <div class="encoder-flow-value encoder-value-pulse" id="encoder-pulse">0</div>
      </div>

      <div class="encoder-flow-arrow">→</div>

      <div>
        <div class="encoder-flow-label">Δθ (rad)</div>
        <div class="encoder-flow-value encoder-value-theta" id="encoder-dtheta">0.000</div>
      </div>

      <div class="encoder-flow-arrow">÷</div>

      <div>
        <div class="encoder-flow-label">Δt (detik)</div>
        <div class="encoder-flow-value encoder-value-dt" id="encoder-dt">0.000</div>
      </div>

      <div class="encoder-flow-arrow">=</div>

      <div>
        <div class="encoder-flow-label">ω (rad/s)</div>
        <div class="encoder-flow-value encoder-value-omega" id="encoder-omega">0</div>
      </div>
    </div>
  </div>

  <!--Info Box-->
  <div class="encoder-infobox">
    <strong>Cara Kerja:</strong>
    <ul>
      <li>LED memancarkan cahaya ke sensor melalui disk.</li>
      <li>Saat lubang lewat, cahaya terdeteksi → Pulsa ON.</li>
      <li>Saat bagian padat lewat, cahaya terblokir → Pulsa OFF.</li>
      <li>Setiap pulsa = perubahan sudut (Δθ).</li>
      <li>Kecepatan sudut (ω) = Δθ / Δt.</li>
    </ul>
  </div>

</div>

<script>
(function() {

  var holes = 12;
  var rotation = 0;
  var isRunning = false;
  var pulseCount = 0;
  var lastPulseTime = null;
  var intervalId = null;

  var diskEl = document.getElementById('encoder-disk');
  var buttonEl = document.getElementById('encoder-button');
  var pulseEl = document.getElementById('encoder-pulse');
  var dthetaEl = document.getElementById('encoder-dtheta');
  var dtEl = document.getElementById('encoder-dt');
  var omegaEl = document.getElementById('encoder-omega');
  var ledEl = document.getElementById('encoder-led');
  var sensorEl = document.getElementById('encoder-sensor');

  (function createHoles() {
    var radius = 100;
    for (var i=0; i<holes; i++) {
      var angle = (i * 360) / holes;
      var rad = (angle - 90) * Math.PI/180;
      var x = 130 + radius * Math.cos(rad);
      var y = 130 + radius * Math.sin(rad);

      var hole = document.createElement('div');
      hole.className = 'encoder-hole';
      hole.style.left = x + 'px';
      hole.style.top  = y + 'px';
      diskEl.appendChild(hole);
    }
  })();

  var deltaTheta = (2 * Math.PI) / holes;
  dthetaEl.textContent = deltaTheta.toFixed(3);

  function setRunningState(running) {
    isRunning = running;

    if (running) {
      buttonEl.textContent = 'STOP Motor';
      buttonEl.classList.remove('encoder-button-start');
      buttonEl.classList.add('encoder-button-stop');

      ledEl.classList.remove('encoder-led-inactive');
      ledEl.classList.add('encoder-led-active');

      sensorEl.classList.remove('encoder-sensor-inactive');
      sensorEl.classList.add('encoder-sensor-active');

      pulseCount = 0;
      pulseEl.textContent = '0';
      dtEl.textContent = '0.000';
      omegaEl.textContent = '0';
      lastPulseTime = null;
      rotation = 0;
      diskEl.style.transform = 'rotate(0deg)';

      startLoop();
    } else {
      buttonEl.textContent = 'START Motor';
      buttonEl.classList.remove('encoder-button-stop');
      buttonEl.classList.add('encoder-button-start');

      ledEl.classList.remove('encoder-led-active');
      ledEl.classList.add('encoder-led-inactive');

      sensorEl.classList.remove('encoder-sensor-active');
      sensorEl.classList.add('encoder-sensor-inactive');

      stopLoop();
    }
  }

  function startLoop() {
    if (intervalId !== null) return;

    intervalId = setInterval(function() {
      var prevRotation = rotation;
      rotation = (rotation + 3) % 360;
      diskEl.style.transform = 'rotate(' + rotation + 'deg)';

      var segSize = 360 / holes;
      var prevIndex = Math.floor(prevRotation / segSize);
      var newIndex  = Math.floor(rotation / segSize);

      if (prevIndex !== newIndex) {
        var now = (window.performance && performance.now)
                  ? performance.now()
                  : Date.now();

        if (lastPulseTime !== null) {
          var deltaT = (now - lastPulseTime) / 1000;
          var omega = deltaTheta / deltaT;

          dtEl.textContent = deltaT.toFixed(3);
          omegaEl.textContent = omega.toFixed(2);
        }

        lastPulseTime = now;
        pulseCount += 1;
        pulseEl.textContent = String(pulseCount);
      }

    }, 16); 
  }

  function stopLoop() {
    if (intervalId !== null) {
      clearInterval(intervalId);
      intervalId = null;
    }
  }

  buttonEl.addEventListener('click', function() {
    setRunningState(!isRunning);
  });

})();
</script>