I wanted to collect time stamped environmental data from the greenhouse in form of temperature, light intensity and humidity readings from several places. Initially I only wanted to use those to control fans and a heater but then decided to also open/close the window/louvre and collect the readout data onto a SD-card. I have a nice big IP67 enclosure installed in the greenhouse which has several cat6 cables coming in from the back which I currently use to supply power for the Arduino and hopefully at some point network access to check on the live conditions. Once the Greenhouse bit is done I’m hoping to add another measuring box outside to take the same reading plus wind and amount of rain as a little weather station. The greenhouse also has an irrigation system so my head already wants to buy more humidity sensors to go into pots and an array of motorised valves but that’s probably another separate system.