Design Of A Lighting System For Energy Saving Based On Wireless Sensor Network

As the energy conservation and environmental protection take more and more attentions,energy saving is becoming increasingly vital.We can detect environment condition automatically through intelligent control.Then,it can adjust environment’s parameters according to the demands of people’s behavior so as to meet people’s demand and save energy.This paper aims to construe a intelligent lighting energy saving system,which can detect theIn this paper,we use constructed intelligent lighting energy saving system,the hardware of which adopt sensor network technology,and that can implement without destroying the original lighting system.Since it can not only reduces the cost of renovation,but also saves electricity.The system’s hardware is composed of wireless sensor node module and lighting node module.Wireless sensor nodes detect and estimate whether the illumination of the environment meets uers’requirements,and then to trigger the lighting nodes work.wireless sensor nodes are also used to constructor the user-demanded illumination array and single luminaire illumination array,and calculate the lighting factors.The lighting nodes control the lights according to the lighting factors.In the paper,also designes a LED-dimming modules,use 1W LED as luminaire.As an important component the system software,Lighting control algorithm is the core of the whole system.After the system calculated the dimming factors,it can control the brightness of our lights through these factors.In the algorithm proposed concepts such as dimming Zone labeled as Z_dim.illumination lighting Zone labeled as Z_lamp and coverage.Dimming Zone Z_dim is circular area which takes user’s location as the center.The algorithm dimming the lights in this zone.In order to solve the factors of the lights,we should first calculate the user-demanded illumination array named E and single luminaire illumination array Aⁱ.The factors of lights are calculated separately in every dimming zone.So,if more than one person enter into the adjacent cells simultaneously,some cells may led to be brighter than others.Therefore,we propose the concept of coverage,which can solve the issue to some extent.Experimental results show that the constructed system is effective and reliable,we experimentize and confirm the system.In the experiment,we arranged 9 lighting nodes and 16 wireless sensor nodes.Experiment show the effect of luminaire lighting in three different states--the initialization state,one cell detected person and two cell detected person.We detect the PWM through oscilloscope,and calculate the pulse duration ratio. The experiment verify correctness of the algorithm in small scale.