Furthermore, this situation is not relevant nowadays because the size of the computer is big and not easy to handle. The studies in [2, 6-7] used programmable interface controllers (PIC) programming. As we know, PIC programming is quite difficult because we need to design our own circuit. GSM network system and internet has been implemented in HAS system [8]. The system using radio frequency (RF) communication protocol has a lower cost
compared to other wireless communication methods such as Bluetooth. However Bluetooth has low power wireless signals
and used frequency hopping spread spectrum (FHSS) modulation. This will help to avoid any interference from any
other wireless devices and easy to communicate with various Bluetooth devices [9]. The studies in [2] and [6] implemented
smart phone as speech based remote control. However in [2] the systems are not using a voice recognition to control the
home appliances.