ESP32 + \u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc \u5e38\u6642\u76e3\u8996 \u2192 \u7570\u5e38\u6642FFT \u2192 \u30b5\u30fc\u30d0\u9001\u4fe1\uff08\u8a2d\u8a08\u307e\u3068\u3081\uff09<\/title>\n <style>\n :root{\n --bg:#ffffff;\n --text:#0b1f44; \/* \u6fc3\u3044\u7d3a *\/\n --muted:#4a5a78; \/* \u8584\u3081\u7d3a *\/\n --line:#e0e6ef; \/* \u7f6b\u7dda *\/\n --card:#ffffff; \/* \u30ab\u30fc\u30c9\u80cc\u666f\u3082\u767d *\/\n --accent:#0d4ea6; \/* \u30ea\u30f3\u30af\u7b49 *\/\n --tagbg:#eef4ff;\n --tagbd:#c9daf6;\n --codebg:#f6f8fc;\n --codebd:#d7e0ef;\n --soft:#fbfcff;\n }\n\n *{box-sizing:border-box}\n body{\n margin:0;\n font-family: system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,\"Noto Sans JP\",sans-serif;\n background: var(--bg);\n color: var(--text);\n line-height: 1.7;\n }\n\n \/* ---- post header (\u767d\u80cc\u666f\u30fb\u7d3a\u6587\u5b57) ---- *\/\n header{\n padding:16px 20px 18px;\n border-bottom:1px solid var(--line);\n background:#fff;\n }\n .post-meta{\n font-size:12px;\n color: var(--muted);\n margin:0 0 6px;\n }\n h1{\n margin:0 0 8px;\n font-size:20px;\n line-height:1.35;\n color: var(--text);\n font-weight:700;\n }\n header p{\n margin:0;\n color: var(--muted);\n font-size:14px;\n }\n\n main{max-width:980px; margin:0 auto; padding:18px}\n .grid{display:grid; gap:14px}\n @media(min-width:900px){ .grid.cols2{grid-template-columns:1.2fr .8fr} }\n\n .card{\n background: var(--card);\n border:1px solid var(--line);\n border-radius:12px;\n padding:14px 14px 12px;\n box-shadow:none;\n }\n\n \/* \u8ffd\u52a0\uff1a\u5c0e\u5165\u30b9\u30c8\u30fc\u30ea\u30fc\u7528 *\/\n .intro{\n margin-bottom:14px;\n }\n .intro .lead{\n font-size:14px;\n color: var(--muted);\n margin:0 0 10px;\n }\n .story{\n background: var(--soft);\n border:1px solid var(--line);\n border-radius:12px;\n padding:12px;\n }\n .story h2{margin:0 0 8px}\n .story p{margin:8px 0}\n .callout{\n border-left:4px solid var(--accent);\n padding:8px 10px;\n background:#fff;\n margin:10px 0 0;\n color: var(--text);\n }\n\n h2{font-size:16px; margin:0 0 10px; color: var(--text)}\n h3{font-size:14px; margin:14px 0 8px; color: var(--text)}\n ul{margin:6px 0 10px 18px}\n li{margin:4px 0}\n\n .tag{\n display:inline-block;\n padding:2px 8px;\n border:1px solid var(--tagbd);\n border-radius:999px;\n font-size:12px;\n color: var(--muted);\n margin-right:6px;\n background: var(--tagbg);\n white-space:nowrap;\n }\n\n .mono{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, \"Liberation Mono\", monospace}\n\n pre{\n margin:10px 0 0;\n padding:12px;\n border-radius:10px;\n background: var(--codebg);\n border:1px solid var(--codebd);\n overflow:auto;\n font-size:12px;\n line-height:1.45;\n color: #132a52;\n }\n code{font-family:inherit}\n\n .note{color: var(--muted); font-size:13px}\n\n .kpi{\n display:grid;\n grid-template-columns:repeat(2, minmax(0,1fr));\n gap:10px;\n margin-top:10px\n }\n .kpi > div{\n padding:10px;\n border-radius:10px;\n border:1px solid var(--line);\n background: var(--soft);\n }\n .kpi b{display:block; font-size:12px; color: var(--muted); margin-bottom:2px}\n .kpi span{font-size:13px; color: var(--text)}\n\n .hr{height:1px; background: var(--line); margin:12px 0}\n\n a{color: var(--accent); text-decoration:none}\n a:hover{text-decoration:underline}\n\n .diagram{\n border:1px solid var(--line);\n border-radius:10px;\n padding:12px;\n background: var(--soft);\n overflow:auto;\n font-size:12px;\n color: var(--muted);\n }\n .diagram b{color: var(--text)}\n .small{font-size:12px}\n\n footer{\n max-width:980px;\n margin:0 auto;\n padding:10px 18px 24px;\n color: var(--muted);\n font-size:12px;\n }\n footer .footbox{\n border-top:1px solid var(--line);\n padding-top:10px;\n }\n <\/style>\n<\/head>\n<body>\n\n<header>\n <div class=\"post-meta\">2026\u5e742\u670813\u65e5 \/ \u6700\u7d42\u66f4\u65b0\u65e5\u6642 : 2026\u5e742\u670813\u65e5 info<\/div>\n\n <p>\u72d9\u3044\uff1aFFT\u3092\u5e38\u6642\u56de\u3055\u305a\u3001<span class=\"tag\">\u8efd\u3044\u7570\u5e38\u691c\u77e5<\/span>\u3067\u30c8\u30ea\u30ac\u3057\u3066 <span class=\"tag\">FFT<\/span> \u3092\u5fc5\u8981\u6642\u3060\u3051\u5b9f\u884c\u3057\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u30b5\u30fc\u30d0\u3078\u9001\u308b\u3002<\/p>\n<\/header>\n\n<main>\n\n \n <section class=\"card intro\">\n <h2>\u306f\u3058\u3081\u306b\uff1a\u793e\u4f1a\u8ab2\u984c\u3068\u300c\u3053\u3093\u306a\u306e\u3042\u3063\u305f\u3089\u3044\u3044\u306a\u300d<\/h2>\n <p class=\"lead\">\n \u76e3\u8996\u3057\u305f\u3044\u5834\u6240\u307b\u3069\u3001\u4eba\u624b\u304c\u8db3\u308a\u307e\u305b\u3093\u3002\u898b\u56de\u308a\u3084\u70b9\u691c\u304c\u5fc5\u8981\u306a\u5834\u6240\u306f\u5897\u3048\u308b\u4e00\u65b9\u306a\u306e\u306b\u3001\u73fe\u5834\u306e\u4eba\u6570\u306f\u6e1b\u308a\u3001\u79fb\u52d5\u6642\u9593\u3082\u30b3\u30b9\u30c8\u3082\u91cd\u304f\u306a\u308b\u3002\n \u3057\u304b\u3082\u707d\u5bb3\u3084\u5f37\u98a8\u30fb\u8c6a\u96e8\u306e\u5f8c\u306f\u300c\u3069\u3053\u304b\u3089\u898b\u306b\u884c\u304f\uff1f\u300d\u304c\u60a9\u307f\u306e\u30bf\u30cd\u306b\u306a\u308a\u307e\u3059\u3002\n <\/p>\n\n <div class=\"story\">\n <h3>\u793e\u4f1a\u8ab2\u984c\uff08\u73fe\u5834\u3067\u8d77\u304d\u3066\u3044\u308b\u3053\u3068\uff09<\/h3>\n <ul>\n <li>\u4eba\u624b\u4e0d\u8db3\u3067\u300c\u5b9a\u671f\u70b9\u691c\u306e\u983b\u5ea6\u3092\u4e0a\u3052\u3089\u308c\u306a\u3044\u300d\u3002<\/li>\n <li>\u7570\u5e38\u304c\u8d77\u304d\u305f\u3042\u3068\u306b\u99c6\u3051\u3064\u3051\u308b\u304c\u3001<strong>\u3069\u3053\u304c\u5371\u306a\u3044\u306e\u304b\u5206\u304b\u3089\u306a\u3044<\/strong>\u306e\u3067\u512a\u5148\u9806\u4f4d\u304c\u3064\u3051\u3065\u3089\u3044\u3002<\/li>\n <li>\u300c\u305f\u3076\u3093\u5927\u4e08\u592b\u300d\u3068\u300c\u3084\u3063\u3071\u308a\u5371\u306a\u3044\u300d\u306e\u9593\u306b\u3001\u5224\u65ad\u306e\u6839\u62e0\u304c\u8584\u3044\u3002<\/li>\n <li>\u76e3\u8996\u30b7\u30b9\u30c6\u30e0\u3092\u5165\u308c\u3066\u3082\u3001<strong>\u8aa4\u691c\u77e5\u304c\u591a\u3044<\/strong>\u3068\u904b\u7528\u304c\u7834\u7dbb\u3059\u308b\uff08\u9cf4\u308a\u3059\u304e\u308b\u8b66\u5831\u306f\u5acc\u308f\u308c\u308b\uff09\u3002<\/li>\n <\/ul>\n\n <h3>\u3053\u3093\u306a\u306e\u3042\u3063\u305f\u3089\u3044\u3044\u306a\uff08\u7406\u60f3\u306e\u59ff\uff09<\/h3>\n <p>\n \u5e73\u5e38\u6642\u306f\u9759\u304b\u306b\u898b\u5b88\u308a\u3001\u7570\u5e38\u306e\u5146\u3057\u3060\u3051\u3092\u62fe\u3063\u3066\u3001<strong>\u300c\u4f55\u304c\u8d77\u304d\u305f\u304b\u300d\u3092\u8aac\u660e\u3067\u304d\u308b<\/strong>\u5f62\u3067\u8a18\u9332\u3057\u3066\u304f\u308c\u308b\u3002\n \u305d\u3057\u3066\u5fc5\u8981\u306a\u60c5\u5831\u3060\u3051\u3092\u81ea\u52d5\u3067\u30b5\u30fc\u30d0\u306b\u9001\u3063\u3066\u3001\u3042\u3068\u304b\u3089\u6bd4\u8f03\u30fb\u5206\u6790\u3067\u304d\u308b\u2015\u2015\u3002\n <\/p>\n\n <div class=\"callout\">\n <strong>\u8981\u671b\u3092\u4e00\u8a00\u306b\u3059\u308b\u3068\uff1a<\/strong><br>\n \u300c\u898b\u56de\u308a\u306b\u884c\u304f\u524d\u306b\u3001\u884c\u304f\u3079\u304d\u5834\u6240\u3068\u201c\u6839\u62e0\u201d\u304c\u5206\u304b\u308b\u4ed5\u7d44\u307f\u304c\u307b\u3057\u3044\u3002\u300d\n <\/div>\n\n <h3>\u3060\u3063\u305f\u3089\u3001\u3053\u3093\u306a\u306e\u8003\u3048\u3066\u307f\u305f<\/h3>\n <p>\n \u305d\u3053\u3067\u3001<strong>ESP32 + \u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc<\/strong>\u3067\u5e38\u6642\u76e3\u8996\u3057\u3064\u3064\u3001\n \u5e73\u5e38\u6642\u306f\u8efd\u3044\u6307\u6a19\u3067\u76e3\u8996\u3057\u3001<strong>\u602a\u3057\u3044\u77ac\u9593\u3060\u3051FFT\u3067\u201c\u4e2d\u8eab\u201d\u3092\u51fa\u3059<\/strong>\u69cb\u6210\u3092\u8003\u3048\u307e\u3057\u305f\u3002\n \u3055\u3089\u306b\u3001\u305d\u306e\u7d50\u679c\u3092\u30a4\u30d9\u30f3\u30c8\u3068\u3057\u3066\u30b5\u30fc\u30d0\u306b\u9001\u308c\u3070\u3001\u73fe\u5834\u306e\u5224\u65ad\u3068\u8aac\u660e\u304c\u4e00\u6c17\u306b\u697d\u306b\u306a\u308a\u307e\u3059\u3002\n <\/p>\n <\/div>\n <\/section>\n \n\n <div class=\"grid cols2\">\n <section class=\"card\">\n <h2>1. \u76ee\u7684\u3068\u65b9\u91dd\uff08\u7d50\u8ad6\uff09<\/h2>\n <ul>\n <li>\u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc\u3092ESP32\u306b\u63a5\u7d9a\u3057\u3066<strong>\u5e38\u6642\u76e3\u8996<\/strong>\u3059\u308b\u3002<\/li>\n <li>\u300c\u304a\u304b\u3057\u3044\u300d\u72b6\u614b\u306b\u306a\u3063\u305f\u77ac\u9593\u3060\u3051<strong>FFT<\/strong>\u3092\u5b9f\u884c\u3057\u3001\u5468\u6ce2\u6570\u7279\u5fb4\uff08\u30d4\u30fc\u30afHz\u30fb\u5e2f\u57df\u30a8\u30cd\u30eb\u30ae\u30fc\u306a\u3069\uff09\u3092\u7b97\u51fa\u3059\u308b\u3002<\/li>\n <li>\u7b97\u51fa\u3057\u305f\u7279\u5fb4\u91cf\uff08\u5fc5\u8981\u306a\u3089\u751f\u6ce2\u5f62\u306e\u4e00\u90e8\uff09\u3092<strong>\u7279\u5b9a\u30b5\u30fc\u30d0\u3078\u9001\u4fe1<\/strong>\u3059\u308b\u3002<\/li>\n <\/ul>\n <div class=\"hr\"><\/div>\n <h3>\u306a\u305cFFT\u306f\u5e38\u6642\u3084\u3089\u306a\u3044\uff1f<\/h3>\n <ul>\n <li>FFT\u306f\u91cd\u3044\uff08CPU\u30fb\u96fb\u529b\u30fb\u901a\u4fe1\u30fb\u8aa4\u691c\u77e5\u306e\u30b3\u30b9\u30c8\u304c\u5897\u3048\u308b\uff09\u3002<\/li>\n <li>\u300c\u7570\u5e38\u306e\u5165\u53e3\u300d\u306fFFT\u3088\u308a\u8efd\u3044\u6307\u6a19\uff08RMS\/\u5206\u6563\/\u30d4\u30fc\u30af\/\u7d99\u7d9a\u6642\u9593\uff09\u3067\u5341\u5206\u691c\u77e5\u3067\u304d\u308b\u3002<\/li>\n <li>FFT\u306f\u300c\u539f\u56e0\u306e\u8aac\u660e\u300d\u300c\u5206\u985e\u300d\u300c\u30ec\u30dd\u30fc\u30c8\u300d\u306b\u5f37\u3044\u3002\u30c8\u30ea\u30ac\u5f8c\u306b\u56de\u3059\u306e\u304c\u5408\u7406\u7684\u3002<\/li>\n <\/ul>\n\n <div class=\"kpi\">\n <div>\n <b>\u63a8\u5968\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0<\/b>\n <span>\u69cb\u9020\u7269\/\u5730\u9707\uff1a<strong>100\u301c400Hz<\/strong> \/ \u6a5f\u68b0\u632f\u52d5\uff1a<strong>\u301c1kHz<\/strong>\uff08\u76ee\u7684\u6b21\u7b2c\uff09<\/span>\n <\/div>\n <div>\n <b>\u63a8\u5968FFT\u70b9\u6570<\/b>\n <span><strong>256 or 512<\/strong>\uff08\u5206\u89e3\u80fd\uff1dFs\/N\uff09<\/span>\n <\/div>\n <div>\n <b>\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1<\/b>\n <span>\u5e38\u306b\u6700\u65b0<strong>10\u79d2\u5206<\/strong>\u7a0b\u5ea6\uff08\u30a4\u30d9\u30f3\u30c8\u524d\u5f8c\u3092\u5207\u308a\u51fa\u3059\uff09<\/span>\n <\/div>\n <div>\n <b>\u9001\u4fe1<\/b>\n <span>\u7570\u5e38\u6642\u306e\u307f <strong>HTTP POST<\/strong>\uff08\u307e\u305f\u306fMQTT\uff09<\/span>\n <\/div>\n <\/div>\n <\/section>\n\n <aside class=\"card\">\n <h2>2. \u30bb\u30f3\u30b5\u30fc\u63a5\u7d9a\u306e\u73fe\u5b9f<\/h2>\n <p class=\"note\">\u300cGPIO\u306b\u4ed8\u3051\u308b\u300d\uff1d\u30a2\u30ca\u30ed\u30b0\u76f4\u8aad\u307f\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u8a00\u3063\u3066\u308b\u306a\u3089\u6ce8\u610f\u3002FFT\u7528\u9014\u306f\u30c7\u30b8\u30bf\u30eb\u52a0\u901f\u5ea6\u304c\u5805\u3044\u3002<\/p>\n\n <h3>\u304a\u3059\u3059\u3081\uff08\u5805\u3044\uff09<\/h3>\n <ul>\n <li><span class=\"tag\">I2C\/SPI<\/span> ADXL345 \/ MPU6050 \/ ICM\u7cfb\uff08\u30c7\u30b8\u30bf\u30eb\u51fa\u529b\uff09<\/li>\n <li>\u30ce\u30a4\u30ba\u304c\u5c11\u306a\u304f\u3001\u30b9\u30b1\u30fc\u30eb\u304c\u5b89\u5b9a\u3002FFT\u306e\u610f\u5473\u304c\u51fa\u308b\u3002<\/li>\n <\/ul>\n\n <h3>\u975e\u63a8\u5968\uff08\u3084\u308b\u306a\u3089\u5de5\u592b\u304c\u5fc5\u8981\uff09<\/h3>\n <ul>\n <li><span class=\"tag\">\u30a2\u30ca\u30ed\u30b0\u51fa\u529b<\/span> \u3092ESP32\u5185\u8535ADC\u3067\u8aad\u3080<\/li>\n <li>ESP32 ADC\u306f\u7656\u304c\u3042\u308b\uff08\u30ce\u30a4\u30ba\u30fb\u975e\u7dda\u5f62\uff09\u3002\u5fae\u5c0f\u632f\u52d5\u306f\u53b3\u3057\u3044\u3002<\/li>\n <li>\u3084\u308b\u306a\u3089\u5916\u4ed8\u3051ADC\uff08ADS1115\u306a\u3069\uff09\u3092\u691c\u8a0e\u3002<\/li>\n <\/ul>\n\n <div class=\"hr\"><\/div>\n <h3>\u91cd\u529b\u6210\u5206\u306e\u6271\u3044<\/h3>\n <ul>\n <li>\u7c21\u6613\uff1a<span class=\"mono\">|a| = sqrt(x\u00b2+y\u00b2+z\u00b2) – 1g<\/span> \u3092\u4f7f\u3046\uff08\u50be\u304d\u5909\u5316\u306b\u5f31\u3044\uff09\u3002<\/li>\n <li>\u5805\u3081\uff1aLPF\u3067\u91cd\u529b\uff08\u59ff\u52e2\uff09\u3092\u63a8\u5b9a\u3057\u3001HPF\u3067\u632f\u52d5\u6210\u5206\u306b\u3059\u308b\u3002<\/li>\n <\/ul>\n <\/aside>\n\n <section class=\"card\">\n <h2>3. \u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\uff08\u58ca\u308c\u306b\u304f\u3044\u69cb\u6210\uff09<\/h2>\n\n <div class=\"diagram mono\">\n<b>[Sampler]<\/b> \u7b49\u9593\u9694\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\uff08\u6700\u91cd\u8981\uff09\n \u2193 (a(t) \u3092\u30ea\u30f3\u30b0\u3078)\n<b>[Detector]<\/b> \u8efd\u91cf\u7570\u5e38\u5224\u5b9a\uff08RMS\/\u5206\u6563\/\u30d4\u30fc\u30af\/\u7d99\u7d9a\u6642\u9593\uff09\n \u2193 (\u95be\u5024\u8d85\u3048\u3067\u30a4\u30d9\u30f3\u30c8\u767a\u706b)\n<b>[FFT Worker]<\/b> \u30a4\u30d9\u30f3\u30c8\u6642\u306e\u307fFFT\uff08\u30d4\u30fc\u30afHz\/\u5e2f\u57df\u30a8\u30cd\u30eb\u30ae\u30fc\u7b49\uff09\n \u2193\n<b>[Uploader]<\/b> HTTP POST \/ MQTT \u9001\u4fe1\uff08\u5931\u6557\u6642\u30ea\u30c8\u30e9\u30a4 \/ \u30ad\u30e5\u30fc\uff09\n <\/div>\n\n <h3>\u30bf\u30b9\u30af\u5206\u5272\uff08ESP32\u306e\u52dd\u3061\u7b4b\uff09<\/h3>\n <ul>\n <li><strong>Sampler<\/strong>\uff1a\u30bf\u30a4\u30de\u30fc\u5272\u308a\u8fbc\u307f or \u9ad8\u512a\u5148\u5ea6\u30bf\u30b9\u30af\uff08\u7b49\u9593\u9694\u3092\u5b88\u308b\uff09<\/li>\n <li><strong>Detector<\/strong>\uff1a\u77ed\u7a93\u3067\u6307\u6a19\u3092\u66f4\u65b0\uff08\u8efd\u3044\uff09<\/li>\n <li><strong>FFT Worker<\/strong>\uff1a\u30c8\u30ea\u30ac\u6642\u306b\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1\u304b\u3089\u5207\u308a\u51fa\u3057\u3066FFT<\/li>\n <li><strong>Uploader<\/strong>\uff1a\u901a\u4fe1\u306f\u5225\u30b9\u30ec\u30c3\u30c9\u3002\u30b5\u30f3\u30d7\u30eb\u53d6\u5f97\u3092\u90aa\u9b54\u3057\u306a\u3044<\/li>\n <\/ul>\n\n <h3>\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1\uff08\u5e38\u6642\u4fdd\u5b58\uff09<\/h3>\n <ul>\n <li>\u4f8b\uff1aFs=200Hz\u300110\u79d2 \u2192 2000\u70b9\u4fdd\u6301<\/li>\n <li>\u30a4\u30d9\u30f3\u30c8\u6642\uff1a\u76f4\u524d2\u79d2 + \u76f4\u5f8c2\u79d2 \u306a\u3069\u3092\u5207\u308a\u51fa\u3059\uff08\u300c\u4f55\u304c\u8d77\u304d\u305f\u304b\u300d\u8aac\u660e\u306b\u52b9\u304f\uff09<\/li>\n <\/ul>\n <\/section>\n\n <aside class=\"card\">\n <h2>4. \u300c\u304a\u304b\u3057\u3044\u300d\u691c\u77e5\uff08FFT\u3058\u3083\u306a\u304f\u3053\u3053\u3067\u6c7a\u3081\u308b\uff09<\/h2>\n <p class=\"note\">\u307e\u305a\u306f\u3053\u308c\u3067\u5341\u5206\u3002\u30c8\u30ea\u30ac\u304c\u5b89\u5b9a\u3057\u3066\u304b\u3089FFT\u3092\u30ea\u30c3\u30c1\u5316\u3002<\/p>\n\n <h3>\u6700\u4f4e\u9650\uff08\u304a\u3059\u3059\u3081\uff09<\/h3>\n <ul>\n <li><span class=\"tag\">RMS<\/span>\uff08\u63fa\u308c\u306e\u5f37\u3055\uff09<\/li>\n <li><span class=\"tag\">\u7d99\u7d9a\u6642\u9593<\/span>\uff08\u77ac\u9593\u30ce\u30a4\u30ba\u3092\u6392\u9664\uff09<\/li>\n <li>\u95be\u5024\u306f\u300c\u5e73\u5e38\u6642\u306eRMS\u306e\u4f55\u500d\u300d\u307f\u305f\u3044\u306b\u3059\u308b\u3068\u73fe\u5834\u8abf\u6574\u304c\u697d<\/li>\n <\/ul>\n\n <h3>\u3082\u3046\u4e00\u6bb5\u826f\u304f\u3059\u308b\u306a\u3089<\/h3>\n <ul>\n <li><span class=\"tag\">\u5206\u6563<\/span> \u3084 <span class=\"tag\">\u30d4\u30fc\u30af<\/span> \u306e\u4f75\u7528<\/li>\n <li><span class=\"tag\">\u5e2f\u57df\u30a8\u30cd\u30eb\u30ae\u30fc<\/span>\uff080.5\u301c15Hz\u306a\u3069\uff09 \u203b\u30d5\u30a3\u30eb\u30bf\u304c\u5fc5\u8981<\/li>\n <\/ul>\n\n <div class=\"hr\"><\/div>\n <h3>\u30c8\u30ea\u30ac\u6761\u4ef6\u4f8b<\/h3>\n <pre><code>\/\/ 0.5\u79d2\u7a93\uff08Fs=200Hz\u306a\u3089100\u70b9\uff09\u3067RMS\u8a08\u7b97\nif (rms > baseline_rms * 4.0 && over_time_ms >= 300) {\n trigger_event();\n}<\/code><\/pre>\n <\/aside>\n\n <section class=\"card\">\n <h2>5. FFT\u3067\u51fa\u3059\u3079\u304d\u300c\u4f7f\u3048\u308b\u300d\u7279\u5fb4\u91cf<\/h2>\n <p class=\"note\">FFT\u306e\u751f\u30b9\u30da\u30af\u30c8\u30eb\u5168\u90e8\u9001\u308b\u3068\u901a\u4fe1\u304c\u592a\u308b\u3002\u307e\u305a\u306f\u7279\u5fb4\u91cf\u3060\u3051\u3067\u5341\u5206\u3002<\/p>\n\n <h3>\u63a8\u5968\uff08\u6700\u4f4e\u9650\uff09<\/h3>\n <ul>\n <li><strong>peak_hz<\/strong>\uff1a\u6700\u5927\u30d4\u30fc\u30af\u5468\u6ce2\u6570<\/li>\n <li><strong>peak_mag<\/strong>\uff1a\u30d4\u30fc\u30af\u632f\u5e45<\/li>\n <li><strong>band_energy<\/strong>\uff1a\u5e2f\u57df\u5225\u30a8\u30cd\u30eb\u30ae\u30fc\uff08\u4f8b\uff1a0\u20135Hz \/ 5\u201315Hz \/ 15\u201330Hz\uff09<\/li>\n <li><strong>rms<\/strong>\uff1a\u30a4\u30d9\u30f3\u30c8\u7a93\u306eRMS<\/li>\n <li><strong>duration_ms<\/strong>\uff1a\u7570\u5e38\u7d99\u7d9a\u6642\u9593<\/li>\n <\/ul>\n\n <h3>FFT\u524d\u51e6\u7406\uff08\u5fc5\u9808\uff09<\/h3>\n <ul>\n <li>DC\u9664\u53bb\uff1a\u5e73\u5747\u3092\u5f15\u304f\uff080Hz\u306e\u5c71\u3092\u6f70\u3059\uff09<\/li>\n <li>\u7a93\u95a2\u6570\uff1aHamming\/Hann\uff08\u6f0f\u308c\u3092\u6e1b\u3089\u3059\uff09<\/li>\n <li>Fs\u3068N\u306f\u56fa\u5b9a\u3057\u3066\u3001\u30b5\u30fc\u30d0\u5074\u3067\u6bd4\u8f03\u53ef\u80fd\u306b\u3059\u308b<\/li>\n <\/ul>\n\n <div class=\"hr\"><\/div>\n <h3>\u5468\u6ce2\u6570\u5206\u89e3\u80fd\u306e\u76ee\u5b89<\/h3>\n <pre class=\"mono\"><code>freq_resolution = Fs \/ N\n\n\u4f8b:\nFs=200Hz, N=512 \u2192 0.39Hz\u523b\u307f\nFs=400Hz, N=512 \u2192 0.78Hz\u523b\u307f<\/code><\/pre>\n <\/section>\n\n <aside class=\"card\">\n <h2>6. \u30b5\u30fc\u30d0\u9001\u4fe1\uff08HTTP POST\u304c\u65e9\u3044\uff09<\/h2>\n <h3>\u304a\u3059\u3059\u3081<\/h3>\n <ul>\n <li>\u7570\u5e38\u6642\u306e\u307f\uff1a<span class=\"tag\">HTTP POST(JSON)<\/span><\/li>\n <li>\u5e38\u6642\u30b9\u30c8\u30ea\u30fc\u30e0\uff1a<span class=\"tag\">MQTT<\/span>\uff08\u5fc5\u8981\u306a\u3089\uff09<\/li>\n <\/ul>\n\n <h3>POST\u30da\u30a4\u30ed\u30fc\u30c9\u4f8b\uff08JSON\uff09<\/h3>\n <pre><code>{\n \"device_id\": \"esp32-001\",\n \"ts_unix_ms\": 1760000000000,\n \"fs_hz\": 200,\n \"n_fft\": 512,\n\n \"trigger\": {\n \"rms\": 0.023,\n \"baseline_rms\": 0.005,\n \"threshold_mult\": 4.0,\n \"duration_ms\": 620\n },\n\n \"fft\": {\n \"peak_hz\": 6.25,\n \"peak_mag\": 1.83,\n \"band_energy\": {\n \"0_5\": 12.1,\n \"5_15\": 33.8,\n \"15_30\": 5.4\n }\n },\n\n \"waveform\": {\n \"format\": \"int16\",\n \"scale\": \"m\/s^2\",\n \"downsampled_hz\": 50,\n \"data_b64\": \"...\"\n }\n}<\/code><\/pre>\n\n <p class=\"note small\">\n \u203b waveform\u306f\u6700\u521d\u306f\u9001\u3089\u306a\u304f\u3066OK\u3002\u5fc5\u8981\u306b\u306a\u3063\u305f\u3089\u300c\u30a4\u30d9\u30f3\u30c8\u6642\u306e\u4e00\u90e8\u3060\u3051\u300d\u300c\u30c0\u30a6\u30f3\u30b5\u30f3\u30d7\u30eb\u300d\u300cBase64\u300d\u306a\u3069\u3067\u8ffd\u52a0\u3002\n <\/p>\n <\/aside>\n\n <section class=\"card\">\n <h2>7. \u5b9f\u88c5\u306e\u8981\u70b9\uff08\u843d\u3068\u3057\u7a74\u3060\u3051\u5148\u306b\u6f70\u3059\uff09<\/h2>\n <h3>\u7b49\u9593\u9694\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u304c\u547d<\/h3>\n <ul>\n <li>NG\uff1aloop\u3067\u30bb\u30f3\u30b5\u30fc\u8aad\u307f \u2192 \u6642\u9593\u304c\u30d6\u30ec\u308b\uff08FFT\u304c\u5618\u306b\u306a\u308b\uff09<\/li>\n <li>OK\uff1a\u30bf\u30a4\u30de\u30fc\u5272\u308a\u8fbc\u307f or \u9ad8\u512a\u5148\u5ea6\u30bf\u30b9\u30af\u3067\u5468\u671f\u56fa\u5b9a<\/li>\n <\/ul>\n\n <h3>\u901a\u4fe1\u3067\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u6b62\u3081\u306a\u3044<\/h3>\n <ul>\n <li>Wi-Fi\/HTTP\u306f\u9045\u5ef6\u304c\u51fa\u308b\u3002Sampler\u3068\u540c\u3058\u30b9\u30ec\u30c3\u30c9\u3067\u3084\u308b\u3068\u30c7\u30fc\u30bf\u304c\u6b20\u3051\u308b\u3002<\/li>\n <li>Uploader\u306f\u5225\u30bf\u30b9\u30af\u3002\u9001\u4fe1\u30ad\u30e5\u30fc\u3092\u6301\u3064\u3002<\/li>\n <\/ul>\n\n <h3>\u518d\u9001\uff08\u73fe\u5834\u3067\u5fc5\u9808\uff09<\/h3>\n <ul>\n <li>\u9001\u4fe1\u5931\u6557\u6642\u306f\u30ad\u30e5\u30fc\u306b\u6b8b\u3059<\/li>\n <li>\u5805\u304f\u3084\u308b\u306a\u3089SPIFFS\/Flash\u306b\u4e00\u6642\u9000\u907f\uff08\u96fb\u6e90\u65ad\u3067\u3082\u6b8b\u3059\uff09<\/li>\n <\/ul>\n\n <h3>\u6642\u523b<\/h3>\n <ul>\n <li>NTP\u3067\u6642\u523b\u5408\u308f\u305b\uff08\u30a4\u30d9\u30f3\u30c8\u306e\u7a81\u304d\u5408\u308f\u305b\u304c\u3067\u304d\u308b\uff09<\/li>\n <\/ul>\n <\/section>\n\n <aside class=\"card\">\n <h2>8. \u3053\u3053\u304b\u3089\u300c\u5b8c\u6210\u30b3\u30fc\u30c9\u300d\u306b\u3059\u308b\u305f\u3081\u306e\u5165\u529b\uff08\u6700\u5c0f\uff09<\/h2>\n <ul>\n <li><strong>\u30bb\u30f3\u30b5\u30fc\u578b\u756a<\/strong>\uff08ADXL345 \/ MPU6050 \/ ICM\u2026\uff09<\/li>\n <li><strong>\u76e3\u8996\u5bfe\u8c61<\/strong>\uff08\u5efa\u7269\/\u8a2d\u5099\/\u6a5f\u68b0\u306a\u3069\uff09<\/li>\n <li><strong>\u72d9\u3044\u306e\u5e2f\u57df<\/strong>\uff08\u4f8b\uff1a0.5\u301c20Hz \/ \u301c200Hz\uff09<\/li>\n <li><strong>\u30b5\u30fc\u30d0\u65b9\u5f0f<\/strong>\uff08HTTP\u306eURL or MQTT broker\uff09<\/li>\n <\/ul>\n <div class=\"hr\"><\/div>\n <p class=\"note\">\n \u3053\u308c\u304c\u63c3\u3048\u3070\u3001ESP32\u5074\u306f\u300cFreeRTOS\u30bf\u30b9\u30af\uff0b\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1\uff0bRMS\u30c8\u30ea\u30ac\uff0bFFT\uff0bHTTP\u9001\u4fe1\u300d\u304c\u3067\u304d\u308b\u306f\u305a\u3002\n <\/p>\n <\/aside>\n\n <section class=\"card\">\n <h2>\u4ed8\u9332\uff1a\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u30d5\u30ed\u30fc\uff08\u64ec\u4f3c\u30b3\u30fc\u30c9\uff09<\/h2>\n <pre><code>\/\/ Sampler: Fs\u56fa\u5b9a\u3067\u52a0\u901f\u5ea6\u53d6\u5f97 \u2192 ring\u3078\na = accel_to_motion_component(x,y,z) \/\/ |a|-1g \u7b49\uff08\u5f8c\u3067\u6539\u5584\u53ef\u80fd\uff09\nring.push(a)\ndetector.feed(a)\n\n\/\/ Detector: \u77ed\u7a93RMS + \u7d99\u7d9a\u6642\u9593\nrms = detector.rms_0_5s()\nif (rms > baseline_rms * TH && over_ms >= HOLD_MS) {\n event_id = new_id()\n fftQueue.push({event_id, now_ms})\n}\n\n\/\/ FFT Worker: ring\u304b\u3089\u76f4\u8fd1N\u70b9\uff0b\u524d\u5f8c\u3092\u5207\u308a\u51fa\u3057\nbuf = ring.slice(last N points or pre\/post)\nbuf -= mean(buf)\nwindow(buf)\nmag = FFT(buf)\nfeatures = extract_peak_and_band_energy(mag)\n\n\/\/ Uploader: JSON\u9001\u4fe1\uff08\u5931\u6557\u6642\u30ea\u30c8\u30e9\u30a4\uff09\npayload = build_payload(device_id, ts, features, ...)\npost_json(SERVER_URL, payload)<\/code><\/pre>\n <\/section>\n\n <aside class=\"card\">\n <h2>\u30e1\u30e2\uff08\u73fe\u5834\u3042\u308b\u3042\u308b\uff09<\/h2>\n <ul>\n <li>\u8aa4\u691c\u77e5\u306f\u300c\u77ac\u9593\u30d4\u30fc\u30af\u300d\u3088\u308a\u300c\u7d99\u7d9a\u6642\u9593\u300d\u3067\u6f70\u3059\u306e\u304c\u4e00\u756a\u52b9\u304f\u3002<\/li>\n <li>\u8a2d\u7f6e\u65b9\u5411\u304c\u5909\u308f\u308b\u306a\u3089\u3001\u5358\u7d14\u306a |a|-1g \u306f\u5f31\u3044\u3002HPF\/LPF\u3067\u91cd\u529b\u5206\u96e2\u304c\u5fc5\u8981\u3002<\/li>\n <li>FFT\u306e\u7d50\u679c\u306f\u201c\u8aac\u660e\u201d\u306b\u306f\u5f37\u3044\u304c\u3001\u201c\u691c\u77e5\u201d\u306b\u306fRMS\u306e\u65b9\u304c\u5f37\u3044\u5834\u9762\u304c\u591a\u3044\u3002<\/li>\n <\/ul>\n <\/aside>\n <\/div>\n<\/main>\n\n<footer>\n <div class=\"footbox\">\n \u3053\u306eHTML\u306f\u300c\u8a2d\u8a08\u307e\u3068\u3081\u300d\u7528\u3002\u5b9f\u88c5\u306b\u843d\u3068\u3059\u5834\u5408\u306f\u30bb\u30f3\u30b5\u30fc\u578b\u756a\uff08I2C\/SPI\/\u30a2\u30ca\u30ed\u30b0\uff09\u3068\u30b5\u30fc\u30d0\u65b9\u5f0f\uff08HTTP\/MQTT\uff09\u3092\u78ba\u5b9a\u3055\u305b\u308b\u5fc5\u8981\u3042\u308a\u3002\n <\/div>\n<\/footer>\n\n<\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>ESP32 + \u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc \u5e38\u6642\u76e3\u8996 \u2192 \u7570\u5e38\u6642FFT \u2192 \u30b5\u30fc\u30d0\u9001\u4fe1\uff08\u8a2d\u8a08\u307e\u3068\u3081\uff09 2026\u5e742\u670813\u65e5 \/ \u6700\u7d42\u66f4\u65b0\u65e5\u6642 : 2026\u5e742\u670813\u65e5 info \u72d9\u3044\uff1aFFT\u3092\u5e38\u6642\u56de\u3055\u305a\u3001\u8efd\u3044\u7570\u5e38\u691c\u77e5\u3067\u30c8\u30ea\u30ac\u3057\u3066 F […]<\/p>\n","protected":false},"author":1,"featured_media":1793,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","vkExUnit_EyeCatch_disable":"","_veu_custom_css":"","veu_display_promotion_alert":"common","vkexunit_cta_each_option":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[70],"tags":[],"class_list":["post-1788","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-70"],"aioseo_notices":[],"veu_head_title_object":{"title":"","add_site_title":""},"jetpack_featured_media_url":"https:\/\/beeknowledge.co.jp\/wp-content\/uploads\/2026\/02\/pla.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1788","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1788"}],"version-history":[{"count":4,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1788\/revisions"}],"predecessor-version":[{"id":1792,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1788\/revisions\/1792"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/media\/1793"}],"wp:attachment":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

$\"\"$ <\/div>\n\n\n\n \n \n ESP32 + \u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc \u5e38\u6642\u76e3\u8996 \u2192 \u7570\u5e38\u6642FFT \u2192 \u30b5\u30fc\u30d0\u9001\u4fe1\uff08\u8a2d\u8a08\u307e\u3068\u3081\uff09<\/title>\n <style>\n :root{\n --bg:#ffffff;\n --text:#0b1f44; \/* \u6fc3\u3044\u7d3a *\/\n --muted:#4a5a78; \/* \u8584\u3081\u7d3a *\/\n --line:#e0e6ef; \/* \u7f6b\u7dda *\/\n --card:#ffffff; \/* \u30ab\u30fc\u30c9\u80cc\u666f\u3082\u767d *\/\n --accent:#0d4ea6; \/* \u30ea\u30f3\u30af\u7b49 *\/\n --tagbg:#eef4ff;\n --tagbd:#c9daf6;\n --codebg:#f6f8fc;\n --codebd:#d7e0ef;\n --soft:#fbfcff;\n }\n\n *{box-sizing:border-box}\n body{\n margin:0;\n font-family: system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,\"Noto Sans JP\",sans-serif;\n background: var(--bg);\n color: var(--text);\n line-height: 1.7;\n }\n\n \/* ---- post header (\u767d\u80cc\u666f\u30fb\u7d3a\u6587\u5b57) ---- *\/\n header{\n padding:16px 20px 18px;\n border-bottom:1px solid var(--line);\n background:#fff;\n }\n .post-meta{\n font-size:12px;\n color: var(--muted);\n margin:0 0 6px;\n }\n h1{\n margin:0 0 8px;\n font-size:20px;\n line-height:1.35;\n color: var(--text);\n font-weight:700;\n }\n header p{\n margin:0;\n color: var(--muted);\n font-size:14px;\n }\n\n main{max-width:980px; margin:0 auto; padding:18px}\n .grid{display:grid; gap:14px}\n @media(min-width:900px){ .grid.cols2{grid-template-columns:1.2fr .8fr} }\n\n .card{\n background: var(--card);\n border:1px solid var(--line);\n border-radius:12px;\n padding:14px 14px 12px;\n box-shadow:none;\n }\n\n \/* \u8ffd\u52a0\uff1a\u5c0e\u5165\u30b9\u30c8\u30fc\u30ea\u30fc\u7528 *\/\n .intro{\n margin-bottom:14px;\n }\n .intro .lead{\n font-size:14px;\n color: var(--muted);\n margin:0 0 10px;\n }\n .story{\n background: var(--soft);\n border:1px solid var(--line);\n border-radius:12px;\n padding:12px;\n }\n .story h2{margin:0 0 8px}\n .story p{margin:8px 0}\n .callout{\n border-left:4px solid var(--accent);\n padding:8px 10px;\n background:#fff;\n margin:10px 0 0;\n color: var(--text);\n }\n\n h2{font-size:16px; margin:0 0 10px; color: var(--text)}\n h3{font-size:14px; margin:14px 0 8px; color: var(--text)}\n ul{margin:6px 0 10px 18px}\n li{margin:4px 0}\n\n .tag{\n display:inline-block;\n padding:2px 8px;\n border:1px solid var(--tagbd);\n border-radius:999px;\n font-size:12px;\n color: var(--muted);\n margin-right:6px;\n background: var(--tagbg);\n white-space:nowrap;\n }\n\n .mono{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, \"Liberation Mono\", monospace}\n\n pre{\n margin:10px 0 0;\n padding:12px;\n border-radius:10px;\n background: var(--codebg);\n border:1px solid var(--codebd);\n overflow:auto;\n font-size:12px;\n line-height:1.45;\n color: #132a52;\n }\n code{font-family:inherit}\n\n .note{color: var(--muted); font-size:13px}\n\n .kpi{\n display:grid;\n grid-template-columns:repeat(2, minmax(0,1fr));\n gap:10px;\n margin-top:10px\n }\n .kpi > div{\n padding:10px;\n border-radius:10px;\n border:1px solid var(--line);\n background: var(--soft);\n }\n .kpi b{display:block; font-size:12px; color: var(--muted); margin-bottom:2px}\n .kpi span{font-size:13px; color: var(--text)}\n\n .hr{height:1px; background: var(--line); margin:12px 0}\n\n a{color: var(--accent); text-decoration:none}\n a:hover{text-decoration:underline}\n\n .diagram{\n border:1px solid var(--line);\n border-radius:10px;\n padding:12px;\n background: var(--soft);\n overflow:auto;\n font-size:12px;\n color: var(--muted);\n }\n .diagram b{color: var(--text)}\n .small{font-size:12px}\n\n footer{\n max-width:980px;\n margin:0 auto;\n padding:10px 18px 24px;\n color: var(--muted);\n font-size:12px;\n }\n footer .footbox{\n border-top:1px solid var(--line);\n padding-top:10px;\n }\n <\/style>\n<\/head>\n<body>\n\n<header>\n <div class=\"post-meta\">2026\u5e742\u670813\u65e5 \/ \u6700\u7d42\u66f4\u65b0\u65e5\u6642 : 2026\u5e742\u670813\u65e5 info<\/div>\n\n <p>\u72d9\u3044\uff1aFFT\u3092\u5e38\u6642\u56de\u3055\u305a\u3001<span class=\"tag\">\u8efd\u3044\u7570\u5e38\u691c\u77e5<\/span>\u3067\u30c8\u30ea\u30ac\u3057\u3066 <span class=\"tag\">FFT<\/span> \u3092\u5fc5\u8981\u6642\u3060\u3051\u5b9f\u884c\u3057\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u30b5\u30fc\u30d0\u3078\u9001\u308b\u3002<\/p>\n<\/header>\n\n<main>\n\n \n <section class=\"card intro\">\n <h2>\u306f\u3058\u3081\u306b\uff1a\u793e\u4f1a\u8ab2\u984c\u3068\u300c\u3053\u3093\u306a\u306e\u3042\u3063\u305f\u3089\u3044\u3044\u306a\u300d<\/h2>\n <p class=\"lead\">\n \u76e3\u8996\u3057\u305f\u3044\u5834\u6240\u307b\u3069\u3001\u4eba\u624b\u304c\u8db3\u308a\u307e\u305b\u3093\u3002\u898b\u56de\u308a\u3084\u70b9\u691c\u304c\u5fc5\u8981\u306a\u5834\u6240\u306f\u5897\u3048\u308b\u4e00\u65b9\u306a\u306e\u306b\u3001\u73fe\u5834\u306e\u4eba\u6570\u306f\u6e1b\u308a\u3001\u79fb\u52d5\u6642\u9593\u3082\u30b3\u30b9\u30c8\u3082\u91cd\u304f\u306a\u308b\u3002\n \u3057\u304b\u3082\u707d\u5bb3\u3084\u5f37\u98a8\u30fb\u8c6a\u96e8\u306e\u5f8c\u306f\u300c\u3069\u3053\u304b\u3089\u898b\u306b\u884c\u304f\uff1f\u300d\u304c\u60a9\u307f\u306e\u30bf\u30cd\u306b\u306a\u308a\u307e\u3059\u3002\n <\/p>\n\n <div class=\"story\">\n <h3>\u793e\u4f1a\u8ab2\u984c\uff08\u73fe\u5834\u3067\u8d77\u304d\u3066\u3044\u308b\u3053\u3068\uff09<\/h3>\n <ul>\n <li>\u4eba\u624b\u4e0d\u8db3\u3067\u300c\u5b9a\u671f\u70b9\u691c\u306e\u983b\u5ea6\u3092\u4e0a\u3052\u3089\u308c\u306a\u3044\u300d\u3002<\/li>\n <li>\u7570\u5e38\u304c\u8d77\u304d\u305f\u3042\u3068\u306b\u99c6\u3051\u3064\u3051\u308b\u304c\u3001<strong>\u3069\u3053\u304c\u5371\u306a\u3044\u306e\u304b\u5206\u304b\u3089\u306a\u3044<\/strong>\u306e\u3067\u512a\u5148\u9806\u4f4d\u304c\u3064\u3051\u3065\u3089\u3044\u3002<\/li>\n <li>\u300c\u305f\u3076\u3093\u5927\u4e08\u592b\u300d\u3068\u300c\u3084\u3063\u3071\u308a\u5371\u306a\u3044\u300d\u306e\u9593\u306b\u3001\u5224\u65ad\u306e\u6839\u62e0\u304c\u8584\u3044\u3002<\/li>\n <li>\u76e3\u8996\u30b7\u30b9\u30c6\u30e0\u3092\u5165\u308c\u3066\u3082\u3001<strong>\u8aa4\u691c\u77e5\u304c\u591a\u3044<\/strong>\u3068\u904b\u7528\u304c\u7834\u7dbb\u3059\u308b\uff08\u9cf4\u308a\u3059\u304e\u308b\u8b66\u5831\u306f\u5acc\u308f\u308c\u308b\uff09\u3002<\/li>\n <\/ul>\n\n <h3>\u3053\u3093\u306a\u306e\u3042\u3063\u305f\u3089\u3044\u3044\u306a\uff08\u7406\u60f3\u306e\u59ff\uff09<\/h3>\n <p>\n \u5e73\u5e38\u6642\u306f\u9759\u304b\u306b\u898b\u5b88\u308a\u3001\u7570\u5e38\u306e\u5146\u3057\u3060\u3051\u3092\u62fe\u3063\u3066\u3001<strong>\u300c\u4f55\u304c\u8d77\u304d\u305f\u304b\u300d\u3092\u8aac\u660e\u3067\u304d\u308b<\/strong>\u5f62\u3067\u8a18\u9332\u3057\u3066\u304f\u308c\u308b\u3002\n \u305d\u3057\u3066\u5fc5\u8981\u306a\u60c5\u5831\u3060\u3051\u3092\u81ea\u52d5\u3067\u30b5\u30fc\u30d0\u306b\u9001\u3063\u3066\u3001\u3042\u3068\u304b\u3089\u6bd4\u8f03\u30fb\u5206\u6790\u3067\u304d\u308b\u2015\u2015\u3002\n <\/p>\n\n <div class=\"callout\">\n <strong>\u8981\u671b\u3092\u4e00\u8a00\u306b\u3059\u308b\u3068\uff1a<\/strong><br>\n \u300c\u898b\u56de\u308a\u306b\u884c\u304f\u524d\u306b\u3001\u884c\u304f\u3079\u304d\u5834\u6240\u3068\u201c\u6839\u62e0\u201d\u304c\u5206\u304b\u308b\u4ed5\u7d44\u307f\u304c\u307b\u3057\u3044\u3002\u300d\n <\/div>\n\n <h3>\u3060\u3063\u305f\u3089\u3001\u3053\u3093\u306a\u306e\u8003\u3048\u3066\u307f\u305f<\/h3>\n <p>\n \u305d\u3053\u3067\u3001<strong>ESP32 + \u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc<\/strong>\u3067\u5e38\u6642\u76e3\u8996\u3057\u3064\u3064\u3001\n \u5e73\u5e38\u6642\u306f\u8efd\u3044\u6307\u6a19\u3067\u76e3\u8996\u3057\u3001<strong>\u602a\u3057\u3044\u77ac\u9593\u3060\u3051FFT\u3067\u201c\u4e2d\u8eab\u201d\u3092\u51fa\u3059<\/strong>\u69cb\u6210\u3092\u8003\u3048\u307e\u3057\u305f\u3002\n \u3055\u3089\u306b\u3001\u305d\u306e\u7d50\u679c\u3092\u30a4\u30d9\u30f3\u30c8\u3068\u3057\u3066\u30b5\u30fc\u30d0\u306b\u9001\u308c\u3070\u3001\u73fe\u5834\u306e\u5224\u65ad\u3068\u8aac\u660e\u304c\u4e00\u6c17\u306b\u697d\u306b\u306a\u308a\u307e\u3059\u3002\n <\/p>\n <\/div>\n <\/section>\n \n\n <div class=\"grid cols2\">\n <section class=\"card\">\n <h2>1. \u76ee\u7684\u3068\u65b9\u91dd\uff08\u7d50\u8ad6\uff09<\/h2>\n <ul>\n <li>\u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc\u3092ESP32\u306b\u63a5\u7d9a\u3057\u3066<strong>\u5e38\u6642\u76e3\u8996<\/strong>\u3059\u308b\u3002<\/li>\n <li>\u300c\u304a\u304b\u3057\u3044\u300d\u72b6\u614b\u306b\u306a\u3063\u305f\u77ac\u9593\u3060\u3051<strong>FFT<\/strong>\u3092\u5b9f\u884c\u3057\u3001\u5468\u6ce2\u6570\u7279\u5fb4\uff08\u30d4\u30fc\u30afHz\u30fb\u5e2f\u57df\u30a8\u30cd\u30eb\u30ae\u30fc\u306a\u3069\uff09\u3092\u7b97\u51fa\u3059\u308b\u3002<\/li>\n <li>\u7b97\u51fa\u3057\u305f\u7279\u5fb4\u91cf\uff08\u5fc5\u8981\u306a\u3089\u751f\u6ce2\u5f62\u306e\u4e00\u90e8\uff09\u3092<strong>\u7279\u5b9a\u30b5\u30fc\u30d0\u3078\u9001\u4fe1<\/strong>\u3059\u308b\u3002<\/li>\n <\/ul>\n <div class=\"hr\"><\/div>\n <h3>\u306a\u305cFFT\u306f\u5e38\u6642\u3084\u3089\u306a\u3044\uff1f<\/h3>\n <ul>\n <li>FFT\u306f\u91cd\u3044\uff08CPU\u30fb\u96fb\u529b\u30fb\u901a\u4fe1\u30fb\u8aa4\u691c\u77e5\u306e\u30b3\u30b9\u30c8\u304c\u5897\u3048\u308b\uff09\u3002<\/li>\n <li>\u300c\u7570\u5e38\u306e\u5165\u53e3\u300d\u306fFFT\u3088\u308a\u8efd\u3044\u6307\u6a19\uff08RMS\/\u5206\u6563\/\u30d4\u30fc\u30af\/\u7d99\u7d9a\u6642\u9593\uff09\u3067\u5341\u5206\u691c\u77e5\u3067\u304d\u308b\u3002<\/li>\n <li>FFT\u306f\u300c\u539f\u56e0\u306e\u8aac\u660e\u300d\u300c\u5206\u985e\u300d\u300c\u30ec\u30dd\u30fc\u30c8\u300d\u306b\u5f37\u3044\u3002\u30c8\u30ea\u30ac\u5f8c\u306b\u56de\u3059\u306e\u304c\u5408\u7406\u7684\u3002<\/li>\n <\/ul>\n\n <div class=\"kpi\">\n <div>\n <b>\u63a8\u5968\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0<\/b>\n <span>\u69cb\u9020\u7269\/\u5730\u9707\uff1a<strong>100\u301c400Hz<\/strong> \/ \u6a5f\u68b0\u632f\u52d5\uff1a<strong>\u301c1kHz<\/strong>\uff08\u76ee\u7684\u6b21\u7b2c\uff09<\/span>\n <\/div>\n <div>\n <b>\u63a8\u5968FFT\u70b9\u6570<\/b>\n <span><strong>256 or 512<\/strong>\uff08\u5206\u89e3\u80fd\uff1dFs\/N\uff09<\/span>\n <\/div>\n <div>\n <b>\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1<\/b>\n <span>\u5e38\u306b\u6700\u65b0<strong>10\u79d2\u5206<\/strong>\u7a0b\u5ea6\uff08\u30a4\u30d9\u30f3\u30c8\u524d\u5f8c\u3092\u5207\u308a\u51fa\u3059\uff09<\/span>\n <\/div>\n <div>\n <b>\u9001\u4fe1<\/b>\n <span>\u7570\u5e38\u6642\u306e\u307f <strong>HTTP POST<\/strong>\uff08\u307e\u305f\u306fMQTT\uff09<\/span>\n <\/div>\n <\/div>\n <\/section>\n\n <aside class=\"card\">\n <h2>2. \u30bb\u30f3\u30b5\u30fc\u63a5\u7d9a\u306e\u73fe\u5b9f<\/h2>\n <p class=\"note\">\u300cGPIO\u306b\u4ed8\u3051\u308b\u300d\uff1d\u30a2\u30ca\u30ed\u30b0\u76f4\u8aad\u307f\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u8a00\u3063\u3066\u308b\u306a\u3089\u6ce8\u610f\u3002FFT\u7528\u9014\u306f\u30c7\u30b8\u30bf\u30eb\u52a0\u901f\u5ea6\u304c\u5805\u3044\u3002<\/p>\n\n <h3>\u304a\u3059\u3059\u3081\uff08\u5805\u3044\uff09<\/h3>\n <ul>\n <li><span class=\"tag\">I2C\/SPI<\/span> ADXL345 \/ MPU6050 \/ ICM\u7cfb\uff08\u30c7\u30b8\u30bf\u30eb\u51fa\u529b\uff09<\/li>\n <li>\u30ce\u30a4\u30ba\u304c\u5c11\u306a\u304f\u3001\u30b9\u30b1\u30fc\u30eb\u304c\u5b89\u5b9a\u3002FFT\u306e\u610f\u5473\u304c\u51fa\u308b\u3002<\/li>\n <\/ul>\n\n <h3>\u975e\u63a8\u5968\uff08\u3084\u308b\u306a\u3089\u5de5\u592b\u304c\u5fc5\u8981\uff09<\/h3>\n <ul>\n <li><span class=\"tag\">\u30a2\u30ca\u30ed\u30b0\u51fa\u529b<\/span> \u3092ESP32\u5185\u8535ADC\u3067\u8aad\u3080<\/li>\n <li>ESP32 ADC\u306f\u7656\u304c\u3042\u308b\uff08\u30ce\u30a4\u30ba\u30fb\u975e\u7dda\u5f62\uff09\u3002\u5fae\u5c0f\u632f\u52d5\u306f\u53b3\u3057\u3044\u3002<\/li>\n <li>\u3084\u308b\u306a\u3089\u5916\u4ed8\u3051ADC\uff08ADS1115\u306a\u3069\uff09\u3092\u691c\u8a0e\u3002<\/li>\n <\/ul>\n\n <div class=\"hr\"><\/div>\n <h3>\u91cd\u529b\u6210\u5206\u306e\u6271\u3044<\/h3>\n <ul>\n <li>\u7c21\u6613\uff1a<span class=\"mono\">|a| = sqrt(x\u00b2+y\u00b2+z\u00b2) – 1g<\/span> \u3092\u4f7f\u3046\uff08\u50be\u304d\u5909\u5316\u306b\u5f31\u3044\uff09\u3002<\/li>\n <li>\u5805\u3081\uff1aLPF\u3067\u91cd\u529b\uff08\u59ff\u52e2\uff09\u3092\u63a8\u5b9a\u3057\u3001HPF\u3067\u632f\u52d5\u6210\u5206\u306b\u3059\u308b\u3002<\/li>\n <\/ul>\n <\/aside>\n\n <section class=\"card\">\n <h2>3. \u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\uff08\u58ca\u308c\u306b\u304f\u3044\u69cb\u6210\uff09<\/h2>\n\n <div class=\"diagram mono\">\n<b>[Sampler]<\/b> \u7b49\u9593\u9694\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\uff08\u6700\u91cd\u8981\uff09\n \u2193 (a(t) \u3092\u30ea\u30f3\u30b0\u3078)\n<b>[Detector]<\/b> \u8efd\u91cf\u7570\u5e38\u5224\u5b9a\uff08RMS\/\u5206\u6563\/\u30d4\u30fc\u30af\/\u7d99\u7d9a\u6642\u9593\uff09\n \u2193 (\u95be\u5024\u8d85\u3048\u3067\u30a4\u30d9\u30f3\u30c8\u767a\u706b)\n<b>[FFT Worker]<\/b> \u30a4\u30d9\u30f3\u30c8\u6642\u306e\u307fFFT\uff08\u30d4\u30fc\u30afHz\/\u5e2f\u57df\u30a8\u30cd\u30eb\u30ae\u30fc\u7b49\uff09\n \u2193\n<b>[Uploader]<\/b> HTTP POST \/ MQTT \u9001\u4fe1\uff08\u5931\u6557\u6642\u30ea\u30c8\u30e9\u30a4 \/ \u30ad\u30e5\u30fc\uff09\n <\/div>\n\n <h3>\u30bf\u30b9\u30af\u5206\u5272\uff08ESP32\u306e\u52dd\u3061\u7b4b\uff09<\/h3>\n <ul>\n <li><strong>Sampler<\/strong>\uff1a\u30bf\u30a4\u30de\u30fc\u5272\u308a\u8fbc\u307f or \u9ad8\u512a\u5148\u5ea6\u30bf\u30b9\u30af\uff08\u7b49\u9593\u9694\u3092\u5b88\u308b\uff09<\/li>\n <li><strong>Detector<\/strong>\uff1a\u77ed\u7a93\u3067\u6307\u6a19\u3092\u66f4\u65b0\uff08\u8efd\u3044\uff09<\/li>\n <li><strong>FFT Worker<\/strong>\uff1a\u30c8\u30ea\u30ac\u6642\u306b\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1\u304b\u3089\u5207\u308a\u51fa\u3057\u3066FFT<\/li>\n <li><strong>Uploader<\/strong>\uff1a\u901a\u4fe1\u306f\u5225\u30b9\u30ec\u30c3\u30c9\u3002\u30b5\u30f3\u30d7\u30eb\u53d6\u5f97\u3092\u90aa\u9b54\u3057\u306a\u3044<\/li>\n <\/ul>\n\n <h3>\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1\uff08\u5e38\u6642\u4fdd\u5b58\uff09<\/h3>\n <ul>\n <li>\u4f8b\uff1aFs=200Hz\u300110\u79d2 \u2192 2000\u70b9\u4fdd\u6301<\/li>\n <li>\u30a4\u30d9\u30f3\u30c8\u6642\uff1a\u76f4\u524d2\u79d2 + \u76f4\u5f8c2\u79d2 \u306a\u3069\u3092\u5207\u308a\u51fa\u3059\uff08\u300c\u4f55\u304c\u8d77\u304d\u305f\u304b\u300d\u8aac\u660e\u306b\u52b9\u304f\uff09<\/li>\n <\/ul>\n <\/section>\n\n <aside class=\"card\">\n <h2>4. \u300c\u304a\u304b\u3057\u3044\u300d\u691c\u77e5\uff08FFT\u3058\u3083\u306a\u304f\u3053\u3053\u3067\u6c7a\u3081\u308b\uff09<\/h2>\n <p class=\"note\">\u307e\u305a\u306f\u3053\u308c\u3067\u5341\u5206\u3002\u30c8\u30ea\u30ac\u304c\u5b89\u5b9a\u3057\u3066\u304b\u3089FFT\u3092\u30ea\u30c3\u30c1\u5316\u3002<\/p>\n\n <h3>\u6700\u4f4e\u9650\uff08\u304a\u3059\u3059\u3081\uff09<\/h3>\n <ul>\n <li><span class=\"tag\">RMS<\/span>\uff08\u63fa\u308c\u306e\u5f37\u3055\uff09<\/li>\n <li><span class=\"tag\">\u7d99\u7d9a\u6642\u9593<\/span>\uff08\u77ac\u9593\u30ce\u30a4\u30ba\u3092\u6392\u9664\uff09<\/li>\n <li>\u95be\u5024\u306f\u300c\u5e73\u5e38\u6642\u306eRMS\u306e\u4f55\u500d\u300d\u307f\u305f\u3044\u306b\u3059\u308b\u3068\u73fe\u5834\u8abf\u6574\u304c\u697d<\/li>\n <\/ul>\n\n <h3>\u3082\u3046\u4e00\u6bb5\u826f\u304f\u3059\u308b\u306a\u3089<\/h3>\n <ul>\n <li><span class=\"tag\">\u5206\u6563<\/span> \u3084 <span class=\"tag\">\u30d4\u30fc\u30af<\/span> \u306e\u4f75\u7528<\/li>\n <li><span class=\"tag\">\u5e2f\u57df\u30a8\u30cd\u30eb\u30ae\u30fc<\/span>\uff080.5\u301c15Hz\u306a\u3069\uff09 \u203b\u30d5\u30a3\u30eb\u30bf\u304c\u5fc5\u8981<\/li>\n <\/ul>\n\n <div class=\"hr\"><\/div>\n <h3>\u30c8\u30ea\u30ac\u6761\u4ef6\u4f8b<\/h3>\n <pre><code>\/\/ 0.5\u79d2\u7a93\uff08Fs=200Hz\u306a\u3089100\u70b9\uff09\u3067RMS\u8a08\u7b97\nif (rms > baseline_rms * 4.0 && over_time_ms >= 300) {\n trigger_event();\n}<\/code><\/pre>\n <\/aside>\n\n <section class=\"card\">\n <h2>5. FFT\u3067\u51fa\u3059\u3079\u304d\u300c\u4f7f\u3048\u308b\u300d\u7279\u5fb4\u91cf<\/h2>\n <p class=\"note\">FFT\u306e\u751f\u30b9\u30da\u30af\u30c8\u30eb\u5168\u90e8\u9001\u308b\u3068\u901a\u4fe1\u304c\u592a\u308b\u3002\u307e\u305a\u306f\u7279\u5fb4\u91cf\u3060\u3051\u3067\u5341\u5206\u3002<\/p>\n\n <h3>\u63a8\u5968\uff08\u6700\u4f4e\u9650\uff09<\/h3>\n <ul>\n <li><strong>peak_hz<\/strong>\uff1a\u6700\u5927\u30d4\u30fc\u30af\u5468\u6ce2\u6570<\/li>\n <li><strong>peak_mag<\/strong>\uff1a\u30d4\u30fc\u30af\u632f\u5e45<\/li>\n <li><strong>band_energy<\/strong>\uff1a\u5e2f\u57df\u5225\u30a8\u30cd\u30eb\u30ae\u30fc\uff08\u4f8b\uff1a0\u20135Hz \/ 5\u201315Hz \/ 15\u201330Hz\uff09<\/li>\n <li><strong>rms<\/strong>\uff1a\u30a4\u30d9\u30f3\u30c8\u7a93\u306eRMS<\/li>\n <li><strong>duration_ms<\/strong>\uff1a\u7570\u5e38\u7d99\u7d9a\u6642\u9593<\/li>\n <\/ul>\n\n <h3>FFT\u524d\u51e6\u7406\uff08\u5fc5\u9808\uff09<\/h3>\n <ul>\n <li>DC\u9664\u53bb\uff1a\u5e73\u5747\u3092\u5f15\u304f\uff080Hz\u306e\u5c71\u3092\u6f70\u3059\uff09<\/li>\n <li>\u7a93\u95a2\u6570\uff1aHamming\/Hann\uff08\u6f0f\u308c\u3092\u6e1b\u3089\u3059\uff09<\/li>\n <li>Fs\u3068N\u306f\u56fa\u5b9a\u3057\u3066\u3001\u30b5\u30fc\u30d0\u5074\u3067\u6bd4\u8f03\u53ef\u80fd\u306b\u3059\u308b<\/li>\n <\/ul>\n\n <div class=\"hr\"><\/div>\n <h3>\u5468\u6ce2\u6570\u5206\u89e3\u80fd\u306e\u76ee\u5b89<\/h3>\n <pre class=\"mono\"><code>freq_resolution = Fs \/ N\n\n\u4f8b:\nFs=200Hz, N=512 \u2192 0.39Hz\u523b\u307f\nFs=400Hz, N=512 \u2192 0.78Hz\u523b\u307f<\/code><\/pre>\n <\/section>\n\n <aside class=\"card\">\n <h2>6. \u30b5\u30fc\u30d0\u9001\u4fe1\uff08HTTP POST\u304c\u65e9\u3044\uff09<\/h2>\n <h3>\u304a\u3059\u3059\u3081<\/h3>\n <ul>\n <li>\u7570\u5e38\u6642\u306e\u307f\uff1a<span class=\"tag\">HTTP POST(JSON)<\/span><\/li>\n <li>\u5e38\u6642\u30b9\u30c8\u30ea\u30fc\u30e0\uff1a<span class=\"tag\">MQTT<\/span>\uff08\u5fc5\u8981\u306a\u3089\uff09<\/li>\n <\/ul>\n\n <h3>POST\u30da\u30a4\u30ed\u30fc\u30c9\u4f8b\uff08JSON\uff09<\/h3>\n <pre><code>{\n \"device_id\": \"esp32-001\",\n \"ts_unix_ms\": 1760000000000,\n \"fs_hz\": 200,\n \"n_fft\": 512,\n\n \"trigger\": {\n \"rms\": 0.023,\n \"baseline_rms\": 0.005,\n \"threshold_mult\": 4.0,\n \"duration_ms\": 620\n },\n\n \"fft\": {\n \"peak_hz\": 6.25,\n \"peak_mag\": 1.83,\n \"band_energy\": {\n \"0_5\": 12.1,\n \"5_15\": 33.8,\n \"15_30\": 5.4\n }\n },\n\n \"waveform\": {\n \"format\": \"int16\",\n \"scale\": \"m\/s^2\",\n \"downsampled_hz\": 50,\n \"data_b64\": \"...\"\n }\n}<\/code><\/pre>\n\n <p class=\"note small\">\n \u203b waveform\u306f\u6700\u521d\u306f\u9001\u3089\u306a\u304f\u3066OK\u3002\u5fc5\u8981\u306b\u306a\u3063\u305f\u3089\u300c\u30a4\u30d9\u30f3\u30c8\u6642\u306e\u4e00\u90e8\u3060\u3051\u300d\u300c\u30c0\u30a6\u30f3\u30b5\u30f3\u30d7\u30eb\u300d\u300cBase64\u300d\u306a\u3069\u3067\u8ffd\u52a0\u3002\n <\/p>\n <\/aside>\n\n <section class=\"card\">\n <h2>7. \u5b9f\u88c5\u306e\u8981\u70b9\uff08\u843d\u3068\u3057\u7a74\u3060\u3051\u5148\u306b\u6f70\u3059\uff09<\/h2>\n <h3>\u7b49\u9593\u9694\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u304c\u547d<\/h3>\n <ul>\n <li>NG\uff1aloop\u3067\u30bb\u30f3\u30b5\u30fc\u8aad\u307f \u2192 \u6642\u9593\u304c\u30d6\u30ec\u308b\uff08FFT\u304c\u5618\u306b\u306a\u308b\uff09<\/li>\n <li>OK\uff1a\u30bf\u30a4\u30de\u30fc\u5272\u308a\u8fbc\u307f or \u9ad8\u512a\u5148\u5ea6\u30bf\u30b9\u30af\u3067\u5468\u671f\u56fa\u5b9a<\/li>\n <\/ul>\n\n <h3>\u901a\u4fe1\u3067\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u6b62\u3081\u306a\u3044<\/h3>\n <ul>\n <li>Wi-Fi\/HTTP\u306f\u9045\u5ef6\u304c\u51fa\u308b\u3002Sampler\u3068\u540c\u3058\u30b9\u30ec\u30c3\u30c9\u3067\u3084\u308b\u3068\u30c7\u30fc\u30bf\u304c\u6b20\u3051\u308b\u3002<\/li>\n <li>Uploader\u306f\u5225\u30bf\u30b9\u30af\u3002\u9001\u4fe1\u30ad\u30e5\u30fc\u3092\u6301\u3064\u3002<\/li>\n <\/ul>\n\n <h3>\u518d\u9001\uff08\u73fe\u5834\u3067\u5fc5\u9808\uff09<\/h3>\n <ul>\n <li>\u9001\u4fe1\u5931\u6557\u6642\u306f\u30ad\u30e5\u30fc\u306b\u6b8b\u3059<\/li>\n <li>\u5805\u304f\u3084\u308b\u306a\u3089SPIFFS\/Flash\u306b\u4e00\u6642\u9000\u907f\uff08\u96fb\u6e90\u65ad\u3067\u3082\u6b8b\u3059\uff09<\/li>\n <\/ul>\n\n <h3>\u6642\u523b<\/h3>\n <ul>\n <li>NTP\u3067\u6642\u523b\u5408\u308f\u305b\uff08\u30a4\u30d9\u30f3\u30c8\u306e\u7a81\u304d\u5408\u308f\u305b\u304c\u3067\u304d\u308b\uff09<\/li>\n <\/ul>\n <\/section>\n\n <aside class=\"card\">\n <h2>8. \u3053\u3053\u304b\u3089\u300c\u5b8c\u6210\u30b3\u30fc\u30c9\u300d\u306b\u3059\u308b\u305f\u3081\u306e\u5165\u529b\uff08\u6700\u5c0f\uff09<\/h2>\n <ul>\n <li><strong>\u30bb\u30f3\u30b5\u30fc\u578b\u756a<\/strong>\uff08ADXL345 \/ MPU6050 \/ ICM\u2026\uff09<\/li>\n <li><strong>\u76e3\u8996\u5bfe\u8c61<\/strong>\uff08\u5efa\u7269\/\u8a2d\u5099\/\u6a5f\u68b0\u306a\u3069\uff09<\/li>\n <li><strong>\u72d9\u3044\u306e\u5e2f\u57df<\/strong>\uff08\u4f8b\uff1a0.5\u301c20Hz \/ \u301c200Hz\uff09<\/li>\n <li><strong>\u30b5\u30fc\u30d0\u65b9\u5f0f<\/strong>\uff08HTTP\u306eURL or MQTT broker\uff09<\/li>\n <\/ul>\n <div class=\"hr\"><\/div>\n <p class=\"note\">\n \u3053\u308c\u304c\u63c3\u3048\u3070\u3001ESP32\u5074\u306f\u300cFreeRTOS\u30bf\u30b9\u30af\uff0b\u30ea\u30f3\u30b0\u30d0\u30c3\u30d5\u30a1\uff0bRMS\u30c8\u30ea\u30ac\uff0bFFT\uff0bHTTP\u9001\u4fe1\u300d\u304c\u3067\u304d\u308b\u306f\u305a\u3002\n <\/p>\n <\/aside>\n\n <section class=\"card\">\n <h2>\u4ed8\u9332\uff1a\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u30d5\u30ed\u30fc\uff08\u64ec\u4f3c\u30b3\u30fc\u30c9\uff09<\/h2>\n <pre><code>\/\/ Sampler: Fs\u56fa\u5b9a\u3067\u52a0\u901f\u5ea6\u53d6\u5f97 \u2192 ring\u3078\na = accel_to_motion_component(x,y,z) \/\/ |a|-1g \u7b49\uff08\u5f8c\u3067\u6539\u5584\u53ef\u80fd\uff09\nring.push(a)\ndetector.feed(a)\n\n\/\/ Detector: \u77ed\u7a93RMS + \u7d99\u7d9a\u6642\u9593\nrms = detector.rms_0_5s()\nif (rms > baseline_rms * TH && over_ms >= HOLD_MS) {\n event_id = new_id()\n fftQueue.push({event_id, now_ms})\n}\n\n\/\/ FFT Worker: ring\u304b\u3089\u76f4\u8fd1N\u70b9\uff0b\u524d\u5f8c\u3092\u5207\u308a\u51fa\u3057\nbuf = ring.slice(last N points or pre\/post)\nbuf -= mean(buf)\nwindow(buf)\nmag = FFT(buf)\nfeatures = extract_peak_and_band_energy(mag)\n\n\/\/ Uploader: JSON\u9001\u4fe1\uff08\u5931\u6557\u6642\u30ea\u30c8\u30e9\u30a4\uff09\npayload = build_payload(device_id, ts, features, ...)\npost_json(SERVER_URL, payload)<\/code><\/pre>\n <\/section>\n\n <aside class=\"card\">\n <h2>\u30e1\u30e2\uff08\u73fe\u5834\u3042\u308b\u3042\u308b\uff09<\/h2>\n <ul>\n <li>\u8aa4\u691c\u77e5\u306f\u300c\u77ac\u9593\u30d4\u30fc\u30af\u300d\u3088\u308a\u300c\u7d99\u7d9a\u6642\u9593\u300d\u3067\u6f70\u3059\u306e\u304c\u4e00\u756a\u52b9\u304f\u3002<\/li>\n <li>\u8a2d\u7f6e\u65b9\u5411\u304c\u5909\u308f\u308b\u306a\u3089\u3001\u5358\u7d14\u306a |a|-1g \u306f\u5f31\u3044\u3002HPF\/LPF\u3067\u91cd\u529b\u5206\u96e2\u304c\u5fc5\u8981\u3002<\/li>\n <li>FFT\u306e\u7d50\u679c\u306f\u201c\u8aac\u660e\u201d\u306b\u306f\u5f37\u3044\u304c\u3001\u201c\u691c\u77e5\u201d\u306b\u306fRMS\u306e\u65b9\u304c\u5f37\u3044\u5834\u9762\u304c\u591a\u3044\u3002<\/li>\n <\/ul>\n <\/aside>\n <\/div>\n<\/main>\n\n<footer>\n <div class=\"footbox\">\n \u3053\u306eHTML\u306f\u300c\u8a2d\u8a08\u307e\u3068\u3081\u300d\u7528\u3002\u5b9f\u88c5\u306b\u843d\u3068\u3059\u5834\u5408\u306f\u30bb\u30f3\u30b5\u30fc\u578b\u756a\uff08I2C\/SPI\/\u30a2\u30ca\u30ed\u30b0\uff09\u3068\u30b5\u30fc\u30d0\u65b9\u5f0f\uff08HTTP\/MQTT\uff09\u3092\u78ba\u5b9a\u3055\u305b\u308b\u5fc5\u8981\u3042\u308a\u3002\n <\/div>\n<\/footer>\n\n<\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>ESP32 + \u52a0\u901f\u5ea6\u30bb\u30f3\u30b5\u30fc \u5e38\u6642\u76e3\u8996 \u2192 \u7570\u5e38\u6642FFT \u2192 \u30b5\u30fc\u30d0\u9001\u4fe1\uff08\u8a2d\u8a08\u307e\u3068\u3081\uff09 2026\u5e742\u670813\u65e5 \/ \u6700\u7d42\u66f4\u65b0\u65e5\u6642 : 2026\u5e742\u670813\u65e5 info \u72d9\u3044\uff1aFFT\u3092\u5e38\u6642\u56de\u3055\u305a\u3001\u8efd\u3044\u7570\u5e38\u691c\u77e5\u3067\u30c8\u30ea\u30ac\u3057\u3066 F […]<\/p>\n","protected":false},"author":1,"featured_media":1793,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","vkExUnit_EyeCatch_disable":"","_veu_custom_css":"","veu_display_promotion_alert":"common","vkexunit_cta_each_option":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[70],"tags":[],"class_list":["post-1788","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-70"],"aioseo_notices":[],"veu_head_title_object":{"title":"","add_site_title":""},"jetpack_featured_media_url":"https:\/\/beeknowledge.co.jp\/wp-content\/uploads\/2026\/02\/pla.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1788","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1788"}],"version-history":[{"count":4,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1788\/revisions"}],"predecessor-version":[{"id":1792,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/1788\/revisions\/1792"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=\/wp\/v2\/media\/1793"}],"wp:attachment":[{"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1788"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1788"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/beeknowledge.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}