ble/ja/examples/test_i2c_adt7410.html

<!doctype html>
<html><body>
<script src="https://chirimen.org/chirimen-TY51822r3/bc/polyfill/blePolyfill.js"></script>

<button id="connect">BLE 接続</button><br/><br/>
<div id="ADT7410value">---</div>

<script>
const DEVICE_UUID = "928a3d40-e8bf-4b2b-b443-66d2569aed50";
async function mainFunction() {
  var bleDevice = await navigator.bluetooth.requestDevice({ filters: [{ services: [DEVICE_UUID] }] });
  var i2cAccess = await navigator.requestI2CAccess(bleDevice);
  document.getElementById("connect").hidden = true;
  var adt7410value = document.getElementById("ADT7410value");

  var port = i2cAccess.ports.get(1);          // I2C I/F の 1番ポートを取得
  var i2cSlaveDevice = await port.open(0x48); // スレーブアドレス 0x48
  await i2cSlaveDevice.write8(0x03,0x80);     // 16 ビットモード設定

  var MSB, LSB, temperature;
  for (;;) {                                  // 無限ループ
    MSB = await i2cSlaveDevice.read8(0x00);   // これ以下の３行が肝です
    LSB = await i2cSlaveDevice.read8(0x01);
    temperature = ((MSB << 8) | (LSB & 0xff)) / 128.0;
    adt7410value.innerHTML = `温度 : ${temperature} ℃`;
    await sleep(1000);
  }
}
document.getElementById("connect").onclick = mainFunction;
</script>
</body></html>