I have an OSPi controller wired up in the garden and wanted a way to include the indoor system into the same UI.
If I was doing this again, I might use the new RPi Zero with a wifi dongle instead of an ESP8266. I could have saved myself the coding and used OSPi firmware on the Zero in remote/gpio station mode. But the RPiZ wasnt out and the ESP + Motor shield was really cheap (~£10). It was also a fun project and having push notification when I need to fill the reservoir is nice.
I think I saw another thread were someone was looking to port OSPi to an ESP8266 but didnt see any results?