The video (not mine!) explains the settings of a similar system I am using. For more info, go to http://openenergymonitor.org/emon/
Other sites where I publish live data: http://daturach.github.io/
TMP36 Temperature Sensor,
Sparkfun Redboard (Arduino Clone),
Raspberry Pi. The sensors are connected to the Redboard. The Raspberry Pi and Redboard talk to each other over I2C (Pi is the master). The Pi updates ThingSpeak.