THE DEVELOPMENT OF AN SMS BASED DOOR CONTROL SYSTEM
Background of Study
Some forms of communication have been going on for quite a long time ever since the first transatlantic telegraph cable in the 1850s. The next milestone was 1901-Marconi’s first transatlantic radio transmission. The bandwidths of these systems were indeed very low, and information transmissions painfully slow (Kennedy and Davis, 2005). The first major development in broadband (1 kHz – 500 MHz) communications came in 1915, when vacuum-tube repeaters were first used, together with carrier telephony, to provide a coast-to-coast telephone service in the United States, utilizing few channels. Less than a century later, broadband wireless communication is widespread. Everyone can pick up a mobile phone and speak with a friend located in a different continent. However, voice calls are only one of the many options. Latest cell phones can send faxes, exchange text messages, e-mails, send and receive pictures via Bluetooth or infrared, and even connect to the internet (Britannica, 2009). Modern electronics is about embedded electronics. This is the use of electronics for the purpose of controlling some devices (Mavino, 1997). With the evolution of modern electronic systems, there is an increase in the level of automation that can be added to special places, homes, automobiles, consumer products etc. The capability of controlling home appliances in a wireless and remote fashion has provided a great convenience to many people in life. Through a wireless remote controller, people can do a remote operation without directly accessing the host of home appliances like fan, lamp, television, washing machines, and security doors. The introduction of the Global System for Mobile Communication (GSM) and particularly the use of hand-held mobile phones brought the innovation of distance communication at remote station (www.ijcsms.com). Nowadays, Short Message Service (SMS) is widely used as a form of data communication. SMS is a communication application in Global System for Mobile communication (GSM) system. It allows interchange of short text messages between mobile telephone devices using standardized communication protocols. Based on this, this research utilizes this facility for remote control systems and appliances. For instance, a man on a journey suddenly remembers that he left the security door open when it was supposed to be closed. The normal condition is to drive back home to close the door, but with the GSM mobile phone in the hand, one looks on how the same could be used to effect control at any point and time (www.ijcsms.com). Home appliance control system (HACS) is based on GSM network technology for transmission of SMS from sender to receiver. The system proposes two sub-systems. Appliance control sub-system enables the user to control home appliances remotely whereas the security alert sub-system provides the remote security monitoring. The system is capable enough to instruct user via SMS from a specific cell number to change the condition of the home appliance according to the user’s needs and requirements. The second aspect is that of security alert which is achieved in a way that on the detection of intrusion the system allows automatic generation of SMS thus alerting the user (Raghavendran, 2011). Automated home devices work via fairly simple systems: PIC and SMS. Home devices such as lights, entertainment systems, heaters, air conditioners, computers, security systems and radios are equipped with receivers. This PIC detects a certain signal initiated by the code SMS and can be housed in a control device such a light switch or most commonly, a remote control (Hassan, 2011). The Short Message Service (SMS) based remote control connects to the serial port featured on many mobile phones. The serial port provides input and output ports capable of being remotely controlled using another mobile phone. Control takes place by...
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