mi-led-display/show_image.html at main · offe/mi-led-display · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>LED Display Control</title>
    <style>
      body {
        font-family: Arial, sans-serif;
        text-align: center;
        padding: 20px;
        background-color: #f4f4f4;
      }
      button {
        font-size: 16px;
        padding: 10px 20px;
        margin: 10px;
        cursor: pointer;
        border: none;
        background-color: #007bff;
        color: white;
        border-radius: 5px;
      }
      button:hover {
        background-color: #0056b3;
      }
      #status {
        margin-top: 20px;
        font-size: 14px;
        color: #333;
      }
    </style>
  </head>
  <body>
    <h1>LED Display Control</h1>
    <button onclick="connectAndSend()">Connect & Send Image</button>
    <button onclick="disconnect()">Disconnect</button>
    <p id="status">Status: Waiting for connection...</p>

    <script>
      let device, server, service, characteristic;

      async function disconnect() {
        if (device) {
          try {
            if (server && server.connected) {
              await device.gatt.disconnect();
              document.getElementById("status").innerText =
                "Status: Disconnected from device.";
              console.log("Device disconnected.");
            } else {
              document.getElementById("status").innerText =
                "Status: No active connection.";
            }
          } catch (error) {
            console.error("Error disconnecting:", error);
            document.getElementById("status").innerText =
              "Status: Error disconnecting.";
          }
        } else {
          document.getElementById("status").innerText =
            "Status: No device to disconnect.";
        }
      }

      async function connectAndSend() {
        try {
          document.getElementById("status").innerText =
            "Status: Requesting Bluetooth device...";

          device = await navigator.bluetooth.requestDevice({
            filters: [{ name: "MI Matrix Display" }], // Change this if needed
            optionalServices: ["0000ffd0-0000-1000-8000-00805f9b34fb"],
          });

          document.getElementById("status").innerText =
            "Status: Connecting to device...";

          server = await device.gatt.connect();
          service = await server.getPrimaryService(
            "0000ffd0-0000-1000-8000-00805f9b34fb"
          );
          characteristic = await service.getCharacteristic(
            "0000ffd1-0000-1000-8000-00805f9b34fb"
          );

          document.getElementById("status").innerText =
            "Status: Sending initialization command...";

          const initCommand = new Uint8Array([
            0xbc, 0x0f, 0xf1, 0x08, 0x08, 0x55,
          ]);
          await characteristic.writeValue(initCommand);
          await delay(2); // 2ms delay

          document.getElementById("status").innerText =
            "Status: Sending image data...";

          const imageData = createPicture(1); // Generate image data
          await sendPicture(characteristic, imageData);

          document.getElementById("status").innerText =
            "Status: Image sent successfully!";
        } catch (error) {
          console.error("Error:", error);
          document.getElementById("status").innerText =
            "Status: Error - " + error.message;
        }
      }

      function delay(ms) {
        return new Promise((resolve) => setTimeout(resolve, ms));
      }

      function createPicture(n) {
        let picture = [];
        for (let y = 0; y < 16; y++) {
          for (let x = 0; x < 16; x++) {
            let r = x * 16;
            let g = y * 16;
            let b = n * 255;
            picture.push([r, g, b]); // Each pixel is an array [r, g, b]
          }
        }
        return picture;
      }

      async function sendPicture(characteristic, imageData) {
        for (let blockIndex = 0; blockIndex < 8; blockIndex++) {
          let blockData = new Uint8Array(100);

          blockData[0] = 0xbc;
          blockData[1] = 0x0f;
          blockData[2] = (blockIndex + 1) & 0xff;

          for (let i = 0; i < 32; i++) {
            let pixelIndex = blockIndex * 32 + i;
            blockData[3 + i * 3] = imageData[pixelIndex][0]; // Red
            blockData[3 + i * 3 + 1] = imageData[pixelIndex][1]; // Green
            blockData[3 + i * 3 + 2] = imageData[pixelIndex][2]; // Blue
          }

          blockData[99] = 0x55;

          console.log(`Sending block ${blockIndex + 1}/8`);
          await characteristic.writeValue(blockData);
          await delay(5);
        }
      }
    </script>
  </body>
</html>