1 Abstract— It often happens that we forget to switch off some electric devices while leaving home for a journey. This will result in wastage of energy and even the device may get damaged due to overheating. Even if we remember that we have not switched off some devices, it may be difficult for us to come back and switch them off. Also, if we are away from home we may have to turn on the lights at night. These are normally not possible in present condition. This paper offers a solution for this problem by using a mobile phone, a common electronic device like AC, tube light, fan, water pump etc. can be controlled by using this circuit. Index Terms— Home Appliances; RF communication; Mobile communication; Johnson counter; CD4017. I. INTRODUCTION A home appliance control system (HACS) is a system which provides various services to remotely operate on home appliances, such as microwave oven, TV, and garage door etc. through remote devices such as mobile phone, desktop and palm-top. This document furnishes the controls of the ON/OFF action of almost any home appliance. The mobile phone is been used in this regard. We can control device switching from almost any corner of the world without any call charges. Earlier efforts include the work of A. Mahmood, who discuss different options of hardware technique [1] for power controlling and monitoring architecture. For Monitoring, hardware is based on current or voltage measuring circuits, Micro Controller Unit (MCU) relay and Zigbee Reduce Function Device (RFD). Chia-Hung Lien, who worked on the Power Monitoring [3] and Control for Electric Home Appliances Based on Power Line Communication. Soyoung Hwang, who worked on developing a Remote Monitoring and [4] Controlling System Based on ZigBee Networks. V. Sathya Narayanan developed Design of Wireless Home automation [2] and security system using PIC Microcontroller. G. Raghavendran developed SMS based [5] wireless home appliance system. Our work provides the advantages of appliance control by a cell phone, through this we can control the devices from any part of the world provided there must be network connection in cell phone. This system has wider range as large as the coverage area of the service provider and also no interference with other controllers and up to ten controls. So this system will be a simple, powerful and flexible tool that will offer this service at any time, and from anywhere with the constraints of the technologies being applied. Possible target appliances include (but are not limited to) microwave oven, Room lights and fans, TV, and garage door etc. Conventionally, others use RF circuits, which have the drawbacks of limited working range, limited frequency range and limited control. Use of a mobile phone for devices control can overcome these limitations. II. OVERVIEW OF THE TECHNOLOGY USED A. CD4017 Working IC 4017 is basically known as the 5 stage Walking ring counter IC widely used in chaser lighting circuits. It takes the clock pulses from the Clock input and makes one of the ten outputs ON in sequence each time a Clock pulse arrives. It is a Decade counter since the counting is in Decimal digits and not in Binary. Fig. 1 IC CD4017 CD4017 works off 5-15 volts while HEF 4017 operates from 3 volts. It has 10 outputs and each output can sink 10 mA current. The IC, take clock pulse from an external oscillator and steps the outputs from negative to positive in a series of 10 steps. Only one output will be high at a time. The IC can be exploited in different ways. It can be used to count up to a certain number and repeating the sequence or halting the count after a particular count or it can be cascaded to another 4017 IC to get higher numbers. It can be also used as a Bi-stable latch in the toggle mode. Its work is based on the Johnson counter method in which the last stage in inverted and fed to the first stage as input. The Register of the IC cycles through a sequence of Bit patterns. Lb=2*Ls Where, Lb is the length of the bit pattern. Ls is the length of the Shift Register. The IC has 10 Spike free Decoded outputs Q0 to Q9, an Active low Carry out pin and Active high and Active Cell Phone Based Home Appliance Control System Rahul Kumar 1 , Amritanshu Srivastava 2 , Rahul Gupta 3 School of Electronics and Communication, Shri Mata Vaishno Devi University rahulbhagat8@gmail.com 1 , 2011eec67@smvdu.ac.in 2 , 2011eec21@smvdu.ac.in 3