www.iaset.us editor@iaset.us AUTOMATED HOME OR OFFICE ELECTRIC CONTROL SYSTEM ANKITA BIHANI 1 , ASWIN CHANDRASEKHARAN 2 & KARTHIK BALASUBRAMANIAN 3 1 School of Computing Science and Engineering, VIT University, Vellore, Tamil Nadu, India 2 School of Information Technology and Engineering, VIT University, Vellore, Tamil Nadu, India 3 School of Electrical Engineering, VIT University, Vellore, Tamil Nadu, India ABSTRACT In the present global scenario, with the raising standards and increasingly dynamic life styles, people are becoming more forgetful about their energy consumption, resulting in increasing electricity bills, which causes worry. At a juncture where energy crisis is one of the most pressing issues of the hour, there is a dire need for a new technology solution to handle this kind of energy wastage. This paper presents a prototype to automate switching on and off of lighting systems and extends the functionality by allowing remote control through DTMF in order to conserve electrical energy. KEYWORDS: Automated, Conservation, Optimization, Embedded System, Occupancy Sensors, DTMF INTRODUCTION The problem statement addressed in this paper is the electricity wastage caused by leaving the electrical appliances in the ON state despite not being in use. The simplest yet most overlooked way of electrical energy conservation is by switching off of the electrical appliances when not required. Occupancy sensors are a convenient way to eliminate the forgetfulness of people when it comes to turning the lights off [1]. Occupancy sensors are devices that can detect movement within a defined space, such as a bedroom, office room, waiting room, rest room etc. Only when movement is detected will these sensors light the area to which they correspond [2]. However, occupancy sensors cannot be used to facilitate switching ON and OFF of electrical appliances like air conditioner, heater. In order to help one control the entire electric system of the home or office from a remote location, DTMF technology comes to use. PROPOSED SYSTEM This system can be implemented using a PIC microcontroller (say PIC 16F877A), a Real Time Clock, an occupancy sensor (say PIR motion sensor), LDR sensor, DTMF decoder, and a relay circuit. A PIR motion sensor is used to detect human activity within the sensor’s range [4]. These types of sensors are made of Pyroelectric sensors, which detect different levels of Infrared Radiation in the surrounding. Apart from Pyroelectric sensors, a group of supporting circuits combined with some resistors and capacitors will be there in the sensor package. It also contains Micro Power PIR motion Detector IC within it, which takes the output of the sensor and does some minor processing on it to emit a digital output pulse from the analog sensor. The following diagram shows the connection diagram of PIR sensor with PIC. International Journal of Electrical and Electronics Engineering (IJEEE) ISSN(P): 2278-9944; ISSN(E): 2278-9952 Vol. 3, Issue 2, Mar 2014, 7-18 © IASET