In smaller greenhouses, a manual system Rack Drive For Greenhouse opened and closed yourself could possibly be installed. These work easiest when the screen material is supported by a monitor system.

Start time – when in the morning will the display screen system start operation
Stop period – when in the afternoon will the display system stop operation
Light level – in what light intensity will the screen be activated either to open or close
Maximum/minimum temperature – what are the limitations of temperature desired
Maximum/minimum humidity – What are the limitations of humidity desired
Gap positions – this models the percent open or close placement under different circumstances such as early on a winter early morning to reduce thermal shock or through the summer to provide better shading. The gap techniques and speed of motion can be controlled in a few systems.
Time delay – under changeable climate this avoids frequent starting and closing
Wind speed – To lessen temperature loss, the screen can be closed early under high wind speed conditions
Snow detection – this can open the display and turn on heat when it begins to snow.
The standard system uses nylon monofilament or stainless steel cables to aid the screen material. The screen material can either rest on top of the network of cables or become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that techniques the leading edge of the screen materials. Control is either with a manual change or electronic controller.

Based on the above, the grower must enter the next parameters in to the controller:

A weather station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.