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+<svg xmlns="http://www.w3.org/2000/svg" width="1920" height="1080" viewBox="0 0 1920 1080" font-family="Arial, Helvetica, sans-serif">
+  <rect width="1920" height="1080" fill="#ffffff"/>
+
+  <text x="960" y="230" text-anchor="middle" font-size="48" font-weight="bold" fill="#1f2937">Kommunikationsweg der Messstation</text>
+
+  <!-- Sensoren -->
+  <rect x="60" y="370" width="220" height="100" rx="14" fill="#dcfce7" stroke="#15803d" stroke-width="3"/>
+  <text x="170" y="413" text-anchor="middle" font-size="26" font-weight="bold" fill="#14532d">DHT11</text>
+  <text x="170" y="445" text-anchor="middle" font-size="18" fill="#14532d">Temp. + Luftfeuchte</text>
+
+  <rect x="60" y="510" width="220" height="100" rx="14" fill="#dcfce7" stroke="#15803d" stroke-width="3"/>
+  <text x="170" y="553" text-anchor="middle" font-size="26" font-weight="bold" fill="#14532d">CCS811</text>
+  <text x="170" y="585" text-anchor="middle" font-size="18" fill="#14532d">eCO₂ + TVOC</text>
+
+  <!-- Uno Messstation -->
+  <rect x="420" y="360" width="220" height="260" rx="14" fill="#dbeafe" stroke="#1d4ed8" stroke-width="3"/>
+  <text x="530" y="440" text-anchor="middle" font-size="26" font-weight="bold" fill="#1e3a8a">Arduino</text>
+  <text x="530" y="472" text-anchor="middle" font-size="26" font-weight="bold" fill="#1e3a8a">Uno R3</text>
+  <text x="530" y="510" text-anchor="middle" font-size="18" fill="#1e3a8a">Messstation</text>
+  <text x="530" y="548" text-anchor="middle" font-size="18" fill="#1e3a8a">liest alle 2 s</text>
+  <text x="530" y="572" text-anchor="middle" font-size="18" fill="#1e3a8a">sendet alle ~4 s</text>
+
+  <!-- ESP-01 -->
+  <rect x="800" y="420" width="200" height="140" rx="14" fill="#ede9fe" stroke="#6d28d9" stroke-width="3"/>
+  <text x="900" y="475" text-anchor="middle" font-size="26" font-weight="bold" fill="#4c1d95">ESP-01</text>
+  <text x="900" y="505" text-anchor="middle" font-size="18" fill="#4c1d95">(ESP8266)</text>
+  <text x="900" y="532" text-anchor="middle" font-size="18" fill="#4c1d95">WLAN-Modul</text>
+
+  <!-- Hotspot -->
+  <rect x="1160" y="420" width="200" height="140" rx="14" fill="#ede9fe" stroke="#6d28d9" stroke-width="3"/>
+  <text x="1260" y="480" text-anchor="middle" font-size="26" font-weight="bold" fill="#4c1d95">Handy-</text>
+  <text x="1260" y="510" text-anchor="middle" font-size="26" font-weight="bold" fill="#4c1d95">Hotspot</text>
+  <text x="1260" y="538" text-anchor="middle" font-size="18" fill="#4c1d95">2,4 GHz</text>
+
+  <!-- Laptop -->
+  <rect x="1520" y="400" width="340" height="170" rx="14" fill="#f3f4f6" stroke="#374151" stroke-width="3"/>
+  <text x="1690" y="455" text-anchor="middle" font-size="26" font-weight="bold" fill="#111827">Laptop</text>
+  <text x="1690" y="490" text-anchor="middle" font-size="18" fill="#111827">Python-Webserver</text>
+  <text x="1690" y="516" text-anchor="middle" font-size="18" fill="#111827">server.py, Port 3000</text>
+  <text x="1690" y="542" text-anchor="middle" font-size="18" fill="#111827">speichert den Verlauf</text>
+
+  <!-- LCD -->
+  <rect x="420" y="720" width="220" height="110" rx="14" fill="#dbeafe" stroke="#1d4ed8" stroke-width="3"/>
+  <text x="530" y="765" text-anchor="middle" font-size="26" font-weight="bold" fill="#1e3a8a">LCD 16×2</text>
+  <text x="530" y="797" text-anchor="middle" font-size="18" fill="#1e3a8a">Anzeige vor Ort</text>
+
+  <!-- Zweiter Uno -->
+  <rect x="800" y="720" width="200" height="110" rx="14" fill="#ffedd5" stroke="#c2410c" stroke-width="3"/>
+  <text x="900" y="765" text-anchor="middle" font-size="26" font-weight="bold" fill="#7c2d12">2. Uno R3</text>
+  <text x="900" y="797" text-anchor="middle" font-size="18" fill="#7c2d12">nur Stromversorgung</text>
+
+  <!-- Browser -->
+  <rect x="1520" y="720" width="340" height="130" rx="14" fill="#f3f4f6" stroke="#374151" stroke-width="3"/>
+  <text x="1690" y="765" text-anchor="middle" font-size="26" font-weight="bold" fill="#111827">Browser (Website)</text>
+  <text x="1690" y="797" text-anchor="middle" font-size="18" fill="#111827">Live-Werte, Verlauf,</text>
+  <text x="1690" y="823" text-anchor="middle" font-size="18" fill="#111827">CO₂-Alarm ab 1000 ppm</text>
+
+  <!-- Datenpfeile -->
+  <g stroke="#1f2937" stroke-width="4" fill="none">
+    <line x1="280" y1="420" x2="406" y2="420"/>
+    <line x1="280" y1="560" x2="406" y2="560"/>
+    <line x1="640" y1="490" x2="786" y2="490"/>
+    <line x1="1000" y1="490" x2="1146" y2="490"/>
+    <line x1="1360" y1="490" x2="1506" y2="490"/>
+    <line x1="530" y1="620" x2="530" y2="706"/>
+    <line x1="1650" y1="720" x2="1650" y2="584"/>
+    <line x1="1730" y1="570" x2="1730" y2="706"/>
+  </g>
+  <g fill="#1f2937">
+    <polygon points="420,420 404,411 404,429"/>
+    <polygon points="420,560 404,551 404,569"/>
+    <polygon points="800,490 784,481 784,499"/>
+    <polygon points="1160,490 1144,481 1144,499"/>
+    <polygon points="1520,490 1504,481 1504,499"/>
+    <polygon points="530,720 521,704 539,704"/>
+    <polygon points="1650,570 1641,586 1659,586"/>
+    <polygon points="1730,720 1721,704 1739,704"/>
+  </g>
+
+  <!-- Strompfeil (gestrichelt) -->
+  <line x1="900" y1="720" x2="900" y2="576" stroke="#c2410c" stroke-width="4" stroke-dasharray="12 8"/>
+  <polygon points="900,560 891,576 909,576" fill="#c2410c"/>
+
+  <!-- Pfeilbeschriftungen -->
+  <g font-size="18" fill="#374151" text-anchor="middle">
+    <text x="350" y="406">Digital (Pin 2)</text>
+    <text x="350" y="546">I²C (A4/A5)</text>
+    <text x="720" y="452">UART Pin 0/1</text>
+    <text x="720" y="476">AT-Befehle</text>
+    <text x="1080" y="452">WLAN</text>
+    <text x="1080" y="476">2,4 GHz</text>
+    <text x="1440" y="452">HTTP POST</text>
+    <text x="1440" y="476">JSON</text>
+    <text x="1440" y="520">/api/messwerte</text>
+  </g>
+  <g font-size="18" fill="#374151">
+    <text x="545" y="668">parallel, 4 Bit</text>
+    <text x="915" y="645" fill="#c2410c">3,3 V + GND</text>
+    <text x="1636" y="640" text-anchor="end">HTTP GET</text>
+    <text x="1636" y="664" text-anchor="end">alle 2 s</text>
+    <text x="1744" y="640">JSON-</text>
+    <text x="1744" y="664">Antwort</text>
+  </g>
+
+  <!-- Legende -->
+  <line x1="660" y1="960" x2="740" y2="960" stroke="#1f2937" stroke-width="4"/>
+  <polygon points="754,960 738,951 738,969" fill="#1f2937"/>
+  <text x="770" y="967" font-size="22" fill="#374151">Daten</text>
+  <line x1="1000" y1="960" x2="1080" y2="960" stroke="#c2410c" stroke-width="4" stroke-dasharray="12 8"/>
+  <polygon points="1094,960 1078,951 1078,969" fill="#c2410c"/>
+  <text x="1110" y="967" font-size="22" fill="#374151">Stromversorgung</text>
+</svg>