In smaller sized greenhouses, a manual program opened and closed by hand could be installed. These work simplest when the screen materials is backed by a track system.
Start time – when each morning will the screen system start operation
Stop period – when in the afternoon will the display system stop operation
Light level – in what light strength will the screen end up being activated either to open up or close
Maximum/minimum temperature – what are the limitations of temperature rack drive for greenhouse china desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this models the percent open up or close position 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 guidelines and speed of movement can be controlled in a few systems.
Time delay – under changeable weather conditions 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 screen and turn on heat when it begins to snow.
The standard system uses nylon monofilament or stainless steel cables to aid the screen materials. The screen material can either rest on top of the network of cables or be suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that techniques the industry leading of the screen material. Control is definitely either with a manual switch or electronic controller.
Based on the above, the grower must enter the next parameters into the controller:
A weather station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.