In smaller sized greenhouses, a manual program opened and closed yourself could possibly be installed. These work simplest when the screen material is supported by a monitor 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 – at what light strength will the screen end up being activated either to open or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this pieces the percent open up or close placement under different circumstances such as early on a winter morning to lessen thermal shock or during the summer to supply Motor Gearboxes For Greenhouse better shading. The gap steps 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 heat loss, the screen can be closed early under high wind speed conditions
Snow detection – this can open the display and turn on the heat when it starts to snow.
The typical system uses nylon monofilament or stainless cables to aid the screen material. The screen material can either rest along with the network 
of cables or be suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the leading edge of the screen materials. Control is either with a manual switch or electronic controller.
Based on the over, the grower must enter the following parameters into the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.