In smaller sized greenhouses, a manual system opened and closed yourself could be installed. These work simplest when the screen material is backed 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 screen system stop operation
Light level – in 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 exactly are the limitations of humidity desired
Gap positions – this sets the percent open or close position under different conditions such as early on a winter morning to reduce thermal shock or through the summer to provide better shading. The gap guidelines and speed of motion can be controlled in a few systems.
Time delay – under changeable climate this avoids frequent Rack Drive For Greenhouse opening and closing
Wind speed – To reduce warmth loss, the screen can be closed early under high wind speed conditions
Snow detection – this may open the display screen 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 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 moves the industry leading of the screen materials. Control is definitely either with a manual switch or electronic controller.

Based on the above, the grower is required to enter the following parameters into the controller:

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