IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-ISSN: 2278-2834,p- ISSN: 2278-8735. Volume 6, Issue 1 (May. - Jun. 2013), PP 65-75 www.iosrjournals.org www.iosrjournals.org 65 | Page Voice Recognition Wireless Home Automation System Based On Zigbee Dhawan S. Thakur 1 and Aditi Sharma 2 . Eternal University, Himachal Pradesh, India Abstract : In the recent years, the Home Automation systems has seen a rapid changes due to introduction of various wireless technologies The explosion in the wireless technology has seen the emergence of many standards, especially in the industrial, scientific and medical (ISM) radio band. ZigBee is an IEEE 802.15.4 standard for data communications with business and consumer devices. Zigbee is targeted at applications that requires low data rate, long battery life, and secure networking. Zigbee has a defined rate of 250 kbits/s, best suited for periodic or intermittent data or a single signal transmission from a sensor or input device. The wireless home Automation systems is supposed to be implemented in existing home environments, without any changes in the infrastructure. The automation centers on recognition of voice commands and uses low-power ZigBee wireless communication modules along with microcontroller. This system is most suitable for the elderly and the disabled persons especially those who live alone and since recognize voice so it is secure. The home automation system is intended to control all lights and electrical appliances in a home or office using voice commands. So in this paperwork our aim is to designed a voice recognition wireless ZigBee based home automation system. Keywords - Home automation, Microcontroller , Voice Recognition, ZigBee, Power Supply. I. INTRODUCTION The Wireless Home Automation System is an integrated system to facilitate elderly and disabled people with an easy-to-use home automation system that can be fully operated based on speech commands. The system is portable and constructed in a way that is easy to install, configure, run, and maintain. A typical wireless home automation system allows one to control house hold appliances from a centralized control unit which is wireless. These appliances usually have to be specially designed to be compatible with each other and with the control unit for most commercially available home automation systems. The project demonstrates a system that can be integrated as a single portable unit and allows one to wirelessly control lights, fans, air conditioners, television sets, security cameras, electronic doors, computer systems, audio/visual equipment’s etc. and turn on or off any appliance that is plugged into a wall outlet, get the status of different sensors and take decision accordingly. The overall system is controlled from a microphone which is connected with HM 2007 speech recognition chip. This chip sends the voice commands in binary sequence to microcontroller. The base station unit takes decision and send the commands to remote station by ZigBee transceiver. The remote system receives the commands through ZigBee transceiver and performs the request function. The sensors unit is capable of detecting when the user enters or leaves the room by measuring the change in signals strength between the access Point and can accordingly turn on or off appliances such as lights and fans and in the meantime send its status back to base station. II. System Overview The home automation system contains both a base station and a remote station. Each station will be packaged separately and have a separate PCB. 2.1 BASE STATION The base station will operate with a +5V power supply. This voltage will be used as the operating voltage for all of the circuit elements in the base station. The microphone in the base station will be picking up audio in a close range. The audio signal from the microphone will be input into the HM 2007 speech recognition chip. The HM 2007 chip will process the audio and determine if the commands are speech commands and valid then it will pass the commands through microcontroller and ZigBee to remote station where the matched command operation will be performed . A 16 x 2 LCD interfaces with the microcontroller to display the current status of the sensors and relay switches on/off state. A sound alarm is given in the base station as well as in the remote station which indicate the status of water level either water in the tank is overflowing (To off the water motor) or below limit(To on).The HM 2007 chip does voice analysis and recognition on the microphone audio signals. The HM 2007 interfaces directly with a microphone and the microcontroller in turn interfaced with ZigBee transceiver. The word length to be recognized will be selected to