Math

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/2544423/widgets/1016327"></iframe>

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/2544423/charts/1?bgcolor=%23ffffff&color=%23d62020&dynamic=true&results=2400&type=line&yaxismax=21&yaxismin=16"></iframe>

<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/2544423/charts/3?bgcolor=%23ffffff&color=%23d62020&dynamic=true&results=3600&title=Wifi&type=line"></iframe>