In Japan, annual lighting energy consumption accounts for 16% of national energy consumption. As an application of WSNs, this research focuses on an LED light control system based on user’s occupancy and environment luminance level. Owing to the wireless energy transmission system developed by our lab, multiple sensors can be freely deployed, compared to conventional systems in which sensors have to co-locate with LED lights on the ceiling due to their power source. By using sensing data from the multiple battery-less IR sensors with overlapped coverage, user’s location and motion is tracked by a maximum likelihood algorithm. The light control scheme mainly focuses on reducing office’s lighting energy consumption and satisfying user’s luminance requirement. The sensing data is collected by the BEMS server and the system is employed to reduce the consumed power of LED lights.
The results show that this LED light control system reduces the energy consumption significantly by 57%, compared to batch control scheme, and satisfies user’s luminance requirement with 100% probability.
Figure. 1 Developed LED control system using battery-less sensor network.
Fig. 2 Experimental results of lighting control.
- D. Maehara, G.K. Tran, K. Sakaguchi, K. Araki, “Experimental Study on Battery-less Sensor Network Activated by Multi-point Wireless Energy Transmission”, IEICE Trans. Commun., Vol. E99-B, No. 4, Apr. 2016.
- T. Yu, Y. Kuki, G. Matsushita, D. Maehara, S. Sampei, K. Sakaguchi, “Design and implementation of lighting control system using battery-less wireless human detection sensor networks”, IEICE Trans. Commun. Vol. E100-B,No.6,pp.-,Jun. 2017.