In smaller sized greenhouses, a manual program opened and closed yourself could possibly be installed. These work easiest when the screen materials is backed by a monitor system.
Start time – when each morning will the screen system start operation
Stop time – when in the afternoon will the display system stop operation
Light level – in what light strength will the screen be activated either to open up or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this units the percent open up or close placement under different circumstances such as in early stages a winter morning to reduce thermal shock or through the summer to supply better shading. The gap measures and speed of motion can be controlled in some systems.
Time delay – under changeable climate this avoids frequent starting and closing
Wind speed – To lessen high temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this can open the display and turn on heat when it starts to snow.
The standard system uses nylon monofilament or stainless steel cables to aid the screen materials. The screen material can possibly rest along with the network of cables or be Motor Gearboxes For Greenhouse 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 can be either with a manual change or 
electronic controller.
Based on the above, the grower must enter the next parameters in to the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.
