In smaller sized greenhouses, a manual program opened and closed yourself could be installed. These work easiest when the screen materials is backed by a track 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 intensity 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 sets the percent open up or close placement under different circumstances such as in early stages a winter early morning to reduce thermal shock or during the summer to provide better shading. The gap steps and speed of motion can be controlled in some systems.
Time delay – below changeable climate this avoids frequent starting and closing
Wind speed – To lessen high temperature loss, the screen could be closed early under high wind speed conditions
Snow detection – this may open the display screen and turn on heat when it begins to snow.
The typical system uses nylon monofilament or stainless Rack Drive For Greenhouse cables to aid the screen material. The screen material can possibly rest along with the network of cables or become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the industry leading of the screen material. Control is usually either with a manual change or electronic controller.

Based on the over, 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.