design and implementation of smart home using zigbee and bluetooth

In this paper, a smart home system is designed and implemented by using both zigbee and bluetooth technologies at 2.4 ghz frequency. it includes two hardware implementations and an android based application. the first hardware, which is called end device, employs the low power zigbee standard and is installed on appliances, lightening system, cooling system, and etc to control them. the second hardware, called coordinator, employs both zigbee and bluetooth. there is only one coordinator in each home, which acts as an interface between the user and end devices. it communicates with end devices through zigbee and with users cellphone through bluetooth. in this smart home, the zigbee and bluetooth protocols are implemented by using cc2530 chip and hc05module, respectively. the smart home utilizes the star network topology. once the user wants to control something, by using the user interface on his/her smart phone, the bluetooth of the cellphone is enabled and a radio signal is sent to hc05 bluetooth module. this module converts the wireless bluetooth signal to the wired ttl signal and sends it through a cable to the coordinator. corresponding to the received signal, the coordinator broadcasts zigbee wireless signal in an 80 square meters house. all end devices receive coordinator’s signal and consequently the relevant end device responds to the coordinator by sending an acknowledge and changing the lightening or cooling system status. in other words, each authorized cellphone can act like a remote control hardware. furthermore, in this work, mac address of the authorized cellphones is used for increasing the security.