Update index.html

Author: margau

index.html

@@ -57,7 +57,7 @@ <h2>Wir entwickeln Software und Hardware, um Sensoren sehr einfach in <a href="h
 						<span class="image featured"><img src="images/pic01.jpg" alt="" /></span>
 						<span class="featured"><h3>Demoinstanz</h3><br>
 							<b>MQTT/HTTP:</b> demo.freifunk-iot.de<br>
-							<br><a href="https://grafana.freifunk-iot.de/d/uE8Im5Emz/dashboard?refresh=30s&orgId=2" target="_blank" class="button alt fit">Grafana</a></span>
+							<br><a href="https://grafana.freifunk-iot.de/d/uE8Im5Emz/dashboard?orgId=2&var-Sensor=demosensor&var-Channel=All" target="_blank" class="button alt fit">Grafana</a></span>
 					</section>
 					<a name="more"></a>
 					<section class="box special features">