Smart homes can be defined as homes which can satisfy the needs of comfort with the help of wireless modules. The smart home technologies make the daily life easier and offers safer, more comfortable and economic life spaces. The smart home systems allow the user to monitor and also control all electronic and electrical devices in the house. In this study, a MATLAB/GUI based graphical interface has been prepared in order to monitor the energy consumption of electrical devices used in the home. Additionally a Simulink model of the system has been created on the basis of standard energy consumption data of real devices. This is a sample simulation and not using real data. Energy consumption data of household electrical appliances with different consumption values can be monitored numerically and graphically via this interface. This study focuses on the alternative usages of ZigBee wireless sensor networks in smart home automation system.