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/
Attic and external Temperature and Humidity situation plus external Pressure. Hosted ion a Raspberry PI. External sensor based on Arduino Nanao, 433 mhx TX, solar powered. Same data sent as IN3AQK call sign on APRS network
Temperature, Relative Humidity off two AM2302 sensors attached to two Raspberry Pi Zeros and talking via MQTT to a Raspberry Pi 3B . PI3B collects sensor data messages and forwards to Thingspeak.
Language: Python 3.5