Heltec ESP8266 with Built in OLED display

I'm still working on the home heating project, and now want to add room thermostats with displays on some of them,

I purchased this:

http://amzn.eu/d/2tnupPt

It was tricky to get going but this guide was fantastic:

https://robotzero.one/heltec-wifi-kit-8

If you see guides that say to use the Adafruit libraries -  feel free to give them a go, but the U82g library worked best for me.