diff --git a/dashboard/static/index.html b/dashboard/static/index.html
index 3d0a26f..6c35d06 100644
--- a/dashboard/static/index.html
+++ b/dashboard/static/index.html
@@ -30,11 +30,11 @@
   <section class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 mb-8" id="devices"></section>
 
   <!-- Chart -->
-  <section class="bg-white rounded-lg border border-slate-200 mb-8 overflow-hidden">
+  <section id="chart-section" class="bg-white rounded-lg border border-slate-200 mb-8 overflow-hidden">
     <div class="px-5 py-4 border-b border-slate-200 flex items-center justify-between">
       <div>
         <h2 class="text-sm font-semibold text-slate-900">History</h2>
-        <p class="text-xs text-slate-500 mt-0.5">Temperature & humidity over time</p>
+        <p id="chart-subtitle" class="text-xs text-slate-500 mt-0.5">—</p>
       </div>
       <select id="chart-device" class="text-sm bg-white border border-slate-200 rounded-md px-2.5 py-1.5 focus:outline-none focus:ring-2 focus:ring-slate-900/10"></select>
     </div>
@@ -191,25 +191,86 @@ function renderMessages() {
   `).join('');
 }
 
+const chartPresets = {
+  Temperature: {
+    subtitle: 'Temperature & humidity over time',
+    datasets: (msgs) => [
+      makeDs('Temperature °C', msgs.map(m => m.decoded?.temperature_c ?? null), '#2563eb', 'y'),
+      makeDs('Humidity %',     msgs.map(m => m.decoded?.humidity_pct ?? null), '#059669', 'y1'),
+    ],
+  },
+  Light: {
+    subtitle: 'Brightness over time',
+    datasets: (msgs) => [
+      makeDs('Brightness (lux)', msgs.map(m => m.decoded?.brightness_lux ?? null), '#d97706', 'y'),
+    ],
+  },
+  Door: {
+    subtitle: 'Cumulative openings',
+    datasets: (msgs) => [
+      makeDs('Event count', msgs.map(m => m.decoded?.event_count ?? null), '#7c3aed', 'y'),
+    ],
+  },
+  Vibration: {
+    subtitle: 'Cumulative vibration events',
+    datasets: (msgs) => [
+      makeDs('Event count', msgs.map(m => m.decoded?.event_count ?? null), '#e11d48', 'y'),
+    ],
+  },
+  Move: {
+    subtitle: 'Cumulative movement events',
+    datasets: (msgs) => [
+      makeDs('Move events', msgs.map(m => m.decoded?.move_events ?? null), '#e11d48', 'y'),
+    ],
+  },
+  Magnet: {
+    subtitle: 'Cumulative magnet events',
+    datasets: (msgs) => [
+      makeDs('Event count', msgs.map(m => m.decoded?.event_count ?? null), '#7c3aed', 'y'),
+    ],
+  },
+  'Reed Switch': {
+    subtitle: 'Cumulative reed switch events',
+    datasets: (msgs) => [
+      makeDs('Reed events', msgs.map(m => m.decoded?.reed_events ?? null), '#7c3aed', 'y'),
+    ],
+  },
+};
+
+function makeDs(label, data, color, yID) {
+  return {
+    label, data, borderColor: color, backgroundColor: color + '14',
+    yAxisID: yID, tension: 0.35, borderWidth: 2, fill: true,
+    spanGaps: true, pointRadius: 2, pointHoverRadius: 4,
+  };
+}
+
 function renderChart() {
   const dev = state.selectedDevice || document.getElementById('chart-device').value;
-  if (!dev) return;
+  const section = document.getElementById('chart-section');
+  const subtitle = document.getElementById('chart-subtitle');
+  if (!dev) { section.style.display = 'none'; return; }
+
   const msgs = (state.messagesByDevice[dev] || []).slice().reverse();
+  const latestMode = msgs.length ? msgs[msgs.length - 1].decoded?.mode : null;
+  const preset = chartPresets[latestMode];
+
+  if (!preset) {
+    section.style.display = 'none';
+    return;
+  }
+  section.style.display = '';
+  subtitle.textContent = preset.subtitle;
+
   const labels = msgs.map(m => fmtShortTime(m.ts));
-  const temps = msgs.map(m => m.decoded?.temperature_c ?? null);
-  const humi = msgs.map(m => m.decoded?.humidity_pct ?? null);
+  const datasets = preset.datasets(msgs);
+  const hasSecondAxis = datasets.some(ds => ds.yAxisID === 'y1');
 
   const ctx = document.getElementById('chart').getContext('2d');
   if (state.chart) state.chart.destroy();
   state.chart = new Chart(ctx, {
     type: 'line',
-    data: {
-      labels,
-      datasets: [
-        { label: 'Temperature °C', data: temps, borderColor: '#2563eb', backgroundColor: 'rgba(37,99,235,0.08)', yAxisID: 'y', tension: 0.35, borderWidth: 2, fill: true, spanGaps: true, pointRadius: 2, pointHoverRadius: 4 },
-        { label: 'Humidity %', data: humi, borderColor: '#059669', backgroundColor: 'rgba(5,150,105,0.08)', yAxisID: 'y1', tension: 0.35, borderWidth: 2, fill: true, spanGaps: true, pointRadius: 2, pointHoverRadius: 4 },
-      ]
-    },
+    data: { labels, datasets },
     options: {
       responsive: true,
       interaction: { mode: 'index', intersect: false },
@@ -219,8 +280,8 @@ function renderChart() {
       },
       scales: {
         x: { ticks: { color: '#94a3b8', font: { size: 11 } }, grid: { color: '#f1f5f9' } },
-        y: { ticks: { color: '#2563eb', font: { size: 11 } }, grid: { color: '#f1f5f9' }, position: 'left', border: { display: false } },
-        y1: { ticks: { color: '#059669', font: { size: 11 } }, grid: { drawOnChartArea: false }, position: 'right', border: { display: false } },
+        y: { ticks: { color: datasets[0].borderColor, font: { size: 11 } }, grid: { color: '#f1f5f9' }, position: 'left', border: { display: false } },
+        ...(hasSecondAxis ? { y1: { ticks: { color: datasets[1].borderColor, font: { size: 11 } }, grid: { drawOnChartArea: false }, position: 'right', border: { display: false } } } : {}),
       }
     }
   });