\n \n {label}\n \n \n {value != null ? value.toFixed(1) : \"—\"}\n {unit}\n \n

\n );\n}\n\nfunction App() {\n const [readings, setReadings] = useState([]);\n const [lastUpdated, setLastUpdated] = useState(null);\n const [error, setError] = useState(null);\n\n const fetchData = useCallback(async () => {\n try {\n const res = await fetch(API_URL);\n if (!res.ok) throw new Error(`HTTP ${res.status}`);\n const data = await res.json();\n\n // Normalise: val town sqlite returns { columns, rows } or plain array\n let rows: any[] = [];\n if (Array.isArray(data)) {\n rows = data;\n } else if (data.rows) {\n // { columns: [...], rows: [[...], ...] }\n rows = data.rows.map((r: any[]) =>\n Object.fromEntries(\n data.columns.map((c: string, i: number) => [c, r[i]]),\n )\n );\n }\n\n // Sort ascending by recorded_at, keep last 50 points\n rows.sort((a, b) => a.recorded_at?.localeCompare(b.recorded_at));\n setReadings(rows.slice(-50));\n setLastUpdated(new Date());\n setError(null);\n } catch (e: any) {\n setError(e.message);\n }\n }, []);\n\n useEffect(() => {\n fetchData();\n const id = setInterval(fetchData, POLL_INTERVAL_MS);\n return () => clearInterval(id);\n }, [fetchData]);\n\n const latest = readings.at(-1);\n\n const chartData = readings.map((r) => ({\n time: formatTime(r.recorded_at),\n temperature: Number(r.temperature),\n humidity: Number(r.humidity),\n }));\n\n console.log({ chartData, readings });\n\n return (\n

\n {/* Header */}\n

\n ESP32 Sensor Dashboard\n

\n {latest?.port ?? \"—\"} · auto-refresh every{\" \"}\n {POLL_INTERVAL_MS / 1000}s\n

\n {lastUpdated\n ? (\n <>\n Last updated
\n {lastUpdated.toLocaleTimeString()}\n \n )\n : \"Loading…\"}\n

\n\n {/* Error banner */}\n {error && (\n

\n ❌ {error}\n

\n )}\n\n {/* Stat cards */}\n

\n \n \n

\n \n Readings\n \n \n {readings.length}\n \n

\n\n {/* Chart */}\n

\n History\n

\n {readings.length === 0\n ? (\n

\n No data yet…\n

\n )\n : (\n \n \n \n \n \n \n \n \n \n \n \n \n )}\n

\n );\n}\n\nfunction client() {\n createRoot(document.getElementById(\"root\")).render();\n}\n\nif (typeof document !== \"undefined\") {\n client();\n}\n\nexport default async function server(request: Request): Promise {\n return new Response(\n `\n \n \n ESP32 Sensor Dashboard\n \n \n \n \n

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nmsilva

esp32-sensors