This paper aims to optimize the usage and consumption of energy in Building Management System (BMS) based on Internet of Things (IoT), fuzzy logic algorithm. Smart meters and other sensing devices will be responsible for the data gathering. Single Board Computer (SBC) used as a web application to control and monitor the energy usage patterns for the connected devices. Also, this paper demonstrates the design and development of fuzzy logic technology. As a result, it delivers faster solutions than the conventional control design. A/C motor speed and lighting system are controlled by fuzzy algorithm according to measurements from temperature and occupancy sensors. MATLAB-simulation is used to achieve the designed goal. OPNET network simulator also has been used to provide an accurate understanding of system
performance.