This paper presents the development of energy monitoring system based on human behavior by integrating Arduino Microcontroller and MATLAB. The goal of this research is to develop an efficient energy monitoring system based on human behavior especially for workers during daytime in workplace. A prototype of this system is constructed, using an Arduino ATMega2560 electronics platform as an interface to dekstop PC. Then, structured programmed is develop in MATLAB software to observe and analyzed the system output. There are three types of sensors that has been used to detect a human behavior which are Passive Infrared Sensor (PIR sensor), touch sensor and push button sensor. Finally, the process of the system and observation of human behavior towards power saving by using the developed system is presented.