In smaller greenhouses, a manual system opened and closed yourself could be installed. These work simplest 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 become activated either to open or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What are the limitations of humidity desired
Gap positions – this units the percent open or close position under different circumstances such as in early stages a winter morning to lessen thermal shock or rack drive for greenhouse china through the summer to supply better shading. The gap guidelines and speed of motion can be controlled in some systems.
Time delay – below changeable weather conditions this avoids frequent starting and closing
Wind speed – To lessen warmth loss, the screen can be closed early below high wind speed conditions
Snow detection – this may open the display and turn on heat when it starts to snow.
The standard system uses nylon monofilament or stainless cables to aid the screen materials. The screen material can possibly rest along with the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the leading edge of the screen materials. Control is either with a manual switch or electronic controller.
Based on the above, the grower is required to enter the next parameters in to the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.
A clock is incorporated to open up and close an energy screen foundation on sunrise and sunset. It really is adjusted weekly to take into account the lengthening or shortening of the daylength. A picture sensor is roofed to activate the machine when the light level inside the greenhouse gets to a preset level either too low through the winter or too much during the summer. Temperature 
and humidity sensors may be included to supply control when preset levels are reached.