MODERATE QUALITY OF VOICE TRANSMISSION USING 8-BIT MICRO-CONTROLLER THROUGH ZIGBEE

Abstract

This paper proposes an integrated approach towards Transmission of Moderate Quality of Voice Signal using 8-bit Microcontroller through Zigbee. Here Zigbee technology is used since it provides seamless addressable connectivity, simple and low cost wireless communication and networking solution for low data rate and low power consumption applications. Generally, Voice over Zigbee prototypes uses high speed Digital Signal Processors or 32- bit Micro Controllers. These prototypes have complex circuitry and are very expensive. Here, in this project we have made a prototype that uses low power 8- bit Micro Controller and Off the Shelf components, which makes it cost effective and easy for production. Because of its cost efficiency and ease of availability of components, it can be easily employed in circuit that uses voice communication. PIC16F876 microcontroller is being here at the transmitter end because of its features such as 10-bit ADC, 8-bit USART. PIC16F73 microcontroller is used at the receiver end because of its features such as 8-bit USART, 8-bit Pulse Width Modulator (PWM). An additional R-2R DAC is also employed at the receiver end. The project is quite helpful in applications such as home monitoring and automation, environmental monitoring, industry control and emerging low rate wireless sensor applications.