I have this controller at my sommerhouse to log temperaure and to enable me to remote switch on the heat.
It is based on my ESP8266 design (look under electronics).
it logges two internal and the outside temperature and the humidity as well. It can store it for a month.
The internet connectivity is made with BLYNK.
I will later publish the SW.
I am working on a new revision which uses the more reliable BME280 sensor in stead of the DHT21 and a 2.8″ TFT display in stead of the 4×20 LCD.