A smart lighting system using wireless sensor actuator network

Indoor lighting accounts for 15–20% of the total energy consumption amongst electrical loads in residential buildings. This paper presents the design, implementation, and testing of a smart lighting system for better visual comfort, high reliability along with energy saving. Environmental conditions such as natural daylight, interior light intensity level, and occupancy state are gathered from distributed sensors. Based on sensors data, the microcontroller is programmed to control lighting intensity and to achieve better energy efficiency. Light-emitting diode (LED) dimmer circuit is designed to be controllable by the PWM signal of the microcontroller and is tested for different types of LED lamps. Dimmable LED lighting system incorporated with smart wireless sensor control is able to achieve a significant amount of energy saving.