Revolving doors usually consists of three or four wings doors that hang on a central shaft and revolve or rotate around a vertical axis in a cylindrical appendix. These doors are energy efficient and help prevent drafts and thus, reduce the loss of cooling or heating of the buildings. They also help to reduce stack effect pressure in buildings. Revolving doors are based on human detection. This is achieved with the assistance of a passive infrared (PIR) sensor. A live body emits infrared energy, which is sensed by the PIR sensor from a considerable distance. This signal is transferred to a microcontroller which operates the door motor, while the closure of the door is managed through a fixed time delay. Furthermore, interrupt signals are controlled through limit switches to prevent locked rotor condition of the motor. Rising disposable income of people is a major factor driving the revolving doors market . Changing lifestyles of people also boosts the market. Rise in the number o...