Greenhouse control system is a system controlling the air temperature in the greenhouse.
The desired temperature is achieved by operating windows' motors. If the inside temperature is too high, the windows are opened; if too low, they are closed. The degree to which the windows are opened/closed is dependent on the difference between the desired and actual temperature - this way the system does not 'overshoot'.
It is possible to extend the system with rain and wind sensors. The current conditions in the greenhouse could also be monitored online and statistics might be stored in a database.