android/IMU2.html at main · Abi-64/android · GitHub

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<!doctype html>
<html>
<head>
  <meta charset="utf-8"/>
  <meta name="viewport" content="width=device-width, initial-scale=1"/>
  <title>IMU Debug Viewer</title>
  <style>
    body{font-family:system-ui,Arial;margin:16px}
    .card{border:1px solid #ddd;border-radius:12px;padding:12px;margin:10px 0}
    button{padding:10px 12px;border-radius:10px;border:1px solid #ddd;background:#f7f7f7}
    pre{white-space:pre-wrap;word-break:break-word}
    .ok{color:#166534} .bad{color:#b91c1c} .muted{color:#555}
  </style>
</head>
<body>
<h2>IMU Debug Viewer (Android)</h2>

<div class="card">
  <button id="startBtn">Start</button>
  <div id="secure" class="muted"></div>
  <div id="status" class="muted" style="margin-top:8px">Status: idle</div>
</div>

<div class="card">
  <b>Data</b>
  <pre id="out">—</pre>
</div>

<div class="card">
  <b>Debug</b>
  <pre id="dbg">—</pre>
</div>

<script>
const out = document.getElementById("out");
const dbg = document.getElementById("dbg");
const statusEl = document.getElementById("status");
const secureEl = document.getElementById("secure");

function logDbg(msg){
  dbg.textContent = (dbg.textContent === "—" ? "" : dbg.textContent + "\n") + msg;
}
function setStatus(msg, good=false){
  statusEl.textContent = "Status: " + msg;
  statusEl.className = good ? "ok" : "muted";
}
function fmt(n){ return (n === null || n === undefined || Number.isNaN(n)) ? "—" : n.toFixed(4); }

secureEl.innerHTML =
  `Secure context: <b class="${window.isSecureContext ? "ok":"bad"}">${window.isSecureContext}</b> (HTTPS required on many phones)`;

let using = null;
let accel = null;
let lin = null;
let gyro = null;
let motionHandler = null;

function stopAll(){
  if (accel) try{ accel.stop(); }catch(e){}
  if (lin)   try{ lin.stop(); }catch(e){}
  if (gyro)  try{ gyro.stop(); }catch(e){}
  accel = lin = gyro = null;

  if (motionHandler){
    window.removeEventListener("devicemotion", motionHandler);
    motionHandler = null;
  }
  using = null;
}

async function tryGenericSensors(){
  // Needs secure context in many cases
  if (!("Accelerometer" in window) && !("LinearAccelerationSensor" in window) && !("Gyroscope" in window)){
    logDbg("Generic Sensor API: not available in this browser.");
    return false;
  }

  // Permissions API is inconsistent, but we try it.
  async function tryPerm(name){
    if (!("permissions" in navigator) || !navigator.permissions.query) return "unknown";
    try{
      const res = await navigator.permissions.query({ name });
      return res.state; // 'granted'|'denied'|'prompt'
    }catch(e){
      return "unknown";
    }
  }

  const accPerm = await tryPerm("accelerometer");
  const gyrPerm = await tryPerm("gyroscope");
  logDbg(`Permissions: accelerometer=${accPerm}, gyroscope=${gyrPerm}`);

  // Start sensors (some browsers throw if not allowed)
  const started = [];

  if ("LinearAccelerationSensor" in window){
    try{
      lin = new LinearAccelerationSensor({ frequency: 60 });
      lin.addEventListener("reading", () => {
        using = "GenericSensor: LinearAccelerationSensor";
        out.textContent =
          `${using}\n` +
          `x: ${fmt(lin.x)}\n` +
          `y: ${fmt(lin.y)}\n` +
          `z: ${fmt(lin.z)}\n`;
      });
      lin.addEventListener("error", (e) => logDbg("LinearAcceleration error: " + (e.error?.name || e.message || e)));
      lin.start();
      started.push("LinearAccelerationSensor");
    }catch(e){ logDbg("LinearAccelerationSensor start failed: " + e); }
  }

  if ("Accelerometer" in window){
    try{
      accel = new Accelerometer({ frequency: 60 });
      accel.addEventListener("reading", () => {
        // If linear acc is running, keep that as primary.
        if (!using) using = "GenericSensor: Accelerometer";
        if (using === "GenericSensor: Accelerometer"){
          out.textContent =
            `${using}\n` +
            `x: ${fmt(accel.x)}\n` +
            `y: ${fmt(accel.y)}\n` +
            `z: ${fmt(accel.z)}\n`;
        }
      });
      accel.addEventListener("error", (e) => logDbg("Accelerometer error: " + (e.error?.name || e.message || e)));
      accel.start();
      started.push("Accelerometer");
    }catch(e){ logDbg("Accelerometer start failed: " + e); }
  }

  if ("Gyroscope" in window){
    try{
      gyro = new Gyroscope({ frequency: 60 });
      gyro.addEventListener("reading", () => {
        logDbg(`Gyro reading: x=${fmt(gyro.x)} y=${fmt(gyro.y)} z=${fmt(gyro.z)}`);
      });
      gyro.addEventListener("error", (e) => logDbg("Gyroscope error: " + (e.error?.name || e.message || e)));
      gyro.start();
      started.push("Gyroscope");
    }catch(e){ logDbg("Gyroscope start failed: " + e); }
  }

  if (started.length){
    setStatus("running (" + started.join(", ") + ")", true);
    return true;
  }
  logDbg("Generic Sensor API: present but nothing started (likely permission / HTTPS issue).");
  return false;
}

async function tryDeviceMotion(){
  if (!("DeviceMotionEvent" in window)){
    logDbg("DeviceMotionEvent: not available.");
    return false;
  }

  // iOS needs requestPermission; Android usually doesn't, but harmless to check.
  if (typeof DeviceMotionEvent.requestPermission === "function"){
    try{
      const res = await DeviceMotionEvent.requestPermission();
      logDbg("DeviceMotion permission result: " + res);
      if (res !== "granted") return false;
    }catch(e){
      logDbg("DeviceMotion requestPermission failed: " + e);
      return false;
    }
  } else {
    logDbg("DeviceMotionEvent.requestPermission: not required/available (common on Android).");
  }

  motionHandler = (e) => {
    using = "DeviceMotionEvent";
    const a = e.acceleration || {};
    const ag = e.accelerationIncludingGravity || {};
    out.textContent =
      `${using}\n` +
      `accel (no grav): x=${fmt(a.x)} y=${fmt(a.y)} z=${fmt(a.z)}\n` +
      `incl grav:       x=${fmt(ag.x)} y=${fmt(ag.y)} z=${fmt(ag.z)}\n`;
  };

  window.addEventListener("devicemotion", motionHandler, { passive: true });
  setStatus("running (DeviceMotionEvent)", true);
  return true;
}

document.getElementById("startBtn").addEventListener("click", async () => {
  stopAll();
  dbg.textContent = "—";
  out.textContent = "—";
  setStatus("starting...");

  // Try Generic Sensor API first (often better on Android)
  const ok1 = await tryGenericSensors();
  if (ok1) return;

  // Fallback to DeviceMotion
  const ok2 = await tryDeviceMotion();
  if (ok2) return;

  setStatus("no sensor data (see Debug)", false);
  logDbg("Nothing worked. Most common fix: host on HTTPS + enable Motion sensors in Android settings.");
});
</script>
</body>
</html>