Browsing by Author "Somasiri, K.G.H.A."
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Item Home Automation System(Uva Wellassa University of Sri Lanka, 2016) Somasiri, K.G.H.A.; Wanniarachchi, W.K.I.L.Home automation refers to the automatic and electronic control of household features, activities, and appliances. Some components of an automated home may include the centralized control of security locks on doors and gates, appliances, windows, lighting, surveillance cameras and HVAC systems (Heating, Ventilation and Air Conditioning). Most existing advanced home automation systems require a big and expensive change of infrastructure since majority of them rely on wired communication. So it is required to change the entire wiring system of the house or wire again for the new home automation system. Obviously, wireless systems may be reduce the burden. And most of the existing systems are only capable of turn ON and OFF the home appliances but do not facilitate to see the states of the load in real time. The main objectives of the research are to design and implement a home automation system that is capable of controlling most of the house appliance wirelessly through a user-friendly web interface and indicate the status of them individually while eliminating the necessity of re- wiring. Any PC or mobile that has internet facility can be used to control it. And also to show the real time status on the web page. In addition, this home automation system is capable of turn on and off lights, control different appliance connected to wall plugs, door locking and unlocking, Shading Level Control and monitor the status. Central control unit required to be connected to the internet all the time since a web server is run by an Arduino Ethernet shield attached to it. All the sub-units are connected to main unit wirelessly via RF transceivers and they communicate both directions. The system was successfully implemented and tested. Keywords: Automation, Surveillance, HVAC, Ethernet shield, TransceiversItem Radio frequency remote controller for domestic AC loads(Uva Wellassa University of Sri Lanka, 2015) Somasiri, K.G.H.A.; Wanniarachchi, W.K.I.L.In today’s electronic market, there are two primary types of remote control systems available to consumers, they are IR (Infrared) based systems and RF (radio frequency) based systems. The most common type of remote control receiver is the IR based. It works well, but with limitations. With an IR remote control, typically, one must have a very clear line of site from the remote to the device that is trying to control. IR transmitting and receiving systems are inexpensive and are generally reliable. The carrier frequency of such infrared signals is typically in the order of around 38 kHz. In most cases, the IR signals are send only one way, in a low-speed burst for distances of up to 30 feet. Even though IR remotes are the most common due to the low cost and most of the time it used to control a single device, RF remote controls are easier to use because they do not require line of sight and do not have to be aimed at the equipment. The RF remote can also be operated from another room. RF remotes use radio frequencies that travel far and can easily pass through walls and floors and also it can control more than one device with a single remote controller. So it offers a far better range in terms of distance. In this work RF remote controller was developed to control domestic AC appliance like CFL/incandescent bulbs, fans, heaters, single phase motors, pumps, etc…