The board is controlled by a microcontroller. The program can be changed according to the customer's needs. 
 
 Great electricity savings since the rentals can not leave the balcony doors or windows open for a long time while the air conditioners are working. 
 The circuit has three adjustable timers, one for each room, which shuts off the air conditioner after the time we have set. 
 This is done so that the air conditioner does not open and close if someone wants to go out on the balcony for a short time e.g. to take his towel out or even to go out himself, immediately closing the door behind him. Opening and closing the air conditioner continuously, apart from being annoying for the customer, is also dangerous for the air conditioner. 
 The time when the air conditioner (s) will be turned off is regulated by the owner of the apartment. 
 It can be easily removed the timer if you want the air conditioner to turn off immediately. 
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