CSEIT172129 | Received: 15 Feb 2017 | Accepted: 24 Feb 2017 | January-February-2017 [(2)1: 168-170 ] International Journal of Scientific Research in Computer Science, Engineering and Information Technology © 2017 IJSRCSEIT | Volume 2 | Issue 1 | ISSN : 2456-3307 168 Radio Frequency Based Automatic Control of Electrical Loads M. Narayanan *1 , M. Ashok Kumar 2 , A. Ranjith Kumar 3 , K. Raja 4 * 1 Assistant Professor, Department of EEE, INFO Institute of Engineering, Coimbatore, Tamilnadu, India 2, 3, 4 UG Student, Department of EEE, INFO Institute of Engineering, Coimbatore, Tamilnadu, India ABSTRACT This paper discusses the application of Radio Frequency (RF) signal in controlling the electrical loads automatically through remote. With the objective to save energy, switch the loads ubiquitously, to avoid unnecessary human moves and to make electrical loads free from wired connection to respective switches, a low cost automation system is proposed. The proposed method uses PIC 16F877A microcontroller, Encoder, Decoder, RF module to control electrical loads. About 15 loads within a distance of 30m can be controlled reliably. Keywords: Microcontroller, Radio Frequency and Electrical Load I. INTRODUCTION The advancement in electronics and communication technologies has made automation as an integral part of every process. From domestic to commercial and power and process industries to save energy, to increase work efficiency of human by reducing tiring moves, to improve productivity and to save time automation is recommended. Here it is done by using RF signal to control electrical loads through remote. Wireless communication among electronic devices became alive due the technological development in the form of Radio Frequency (RF) and Infrared (IR). RF remotes are very common; they are used in devices such as garage door openers, remote control toys and remote car-entry key, remote wall sockets, etc. Cell phones, walkie-talkies, WiFi setups and cordless phones are all transmitting radio signals at varying frequencies. The problem with RF remotes is the sheer number of radio signals flying through the air at any given time [3]. IR stands for Infrared and it is produced by LED source. A single IR remote control is developed for controlling several home appliances like Television, DVD, Set top box, Home theatre and Air Conditioner. IR transmit and receive systems are inexpensive and are generally reliable. However, interference from other IR sources can be a minor issue. Interference can also be caused by other light sources such as fluorescent lights (the ballast can cause IR interference). Sometimes some electronic ballast powered light can cause interference problems. In order to avoid any interference with this kind of equipment, the operating frequency of all electronic ballasts has to be chosen so that problems in the 36k Hz frequency area are out of the question [4]. The useful feature of RF remotes that sets them apart from infrared (IR) remotes is they can transmit signals up to 100 feet (30.5 meters) and can travel through walls and furniture [3] whereas Infrared uses “line of sight”. II. METHODS AND MATERIAL A. Literature Survey Control of electrical loads is usually done through wires. The control strategy changed rapidly as technologies advanced [10]. In GSM based Home automation, the system primarily uses SMS messages to communicate the commands issued by the user to the main control system at home. This system offers the ability to control the appliances