Public Addressing System (PA) is an electronic sound and amplification distribution system with a microphone, amplifier and loudspeakers. PA systems are widely used to make announcements in public, institutional and commercial buildings and locations . In PA systems cost, quality and expansion are the major factors that affect the working and implementation of the system. The Zigbee based monitoring and controlling help us to improve the quality and performance, reduce cost, power and complexity and simplifies expansion. The proposed project is a wireless controlling, delivering and monitoring system for a public addressing system by combining embedded and Zigbee wireless network technology for low power and low cost data communication in fields were wired communication is expensive and complex. Zigbee is a secure, popular, low power, low data rate and low cost Wireless Personal Area Network. Zigbee devices are used in smart energy, medical and in home automation. This project has a server and a number of client modules. Server module remotely starts, monitors and stops client modules using Zigbee server module. Client modules connect to the server through Zigbee client module. The system can be fully controlled from a single system (server module) through a GUI, which can be developed from any of the visual developing tools. The proposed application can be used to make low rate, low cost, secure and easily expandable systems for announcements in public, institutional and commercial buildings and locations.

1. Mohini Reddy and Vidya Sawant, "Remote Monitoring and Control System for DC Motor using Zigbee Protocol", International Journal of Application or Innovation in Engineering & Management (IJAIEM), Volume 3, Issue 4, April 2014
2. Ramya, C. M, Shanmugaraj. M. and Prabakaran, R. ,"Study on ZigBee technology" Electronics Computer Technology(ICECT), 2011 3rd International Conference on Volume: 6, April 2011
3. T. Kalaivani, Aallirani and P. Priya, "A Survey on Zigbee Based Wireless Sensor Networks in Agriculture": Department of ECE, 2011 IEEE.
4. Archana R. Raut and Dr. L. G. Malik," ZigBee Based Industrial Automation Profile for Power Monitoring Systems" International Journal on Computer Science and Engineering (IJCSE) ,ISSN : 0975-3397Vol. 3 No. 5 May 2011.
5. K. Anusha and K. Balakrishna "An Adaptive Embedded System for Monitoring Patients", International Journal of Application or Innovation in Engineering & Management (IJAIEM), Volume 2, Issue 7, July 2013.
6. Ms. Trupti Patil and Ms. R. AnjuRanjani, "Design of Monitoring System for Water Supply for Metropolitan City Using Embedded Technology", International Journal of Advanced Research in Computer Science and Software Engineering, Volume 3, Issue 7, July 2013.
7. Hen Hui, Zhou Wenchao and so on, "Design of the embedded remote meter reading system based on ethernet," Electronic Design Engineering, vol. 20, 2012, pp. 184-186.
8. S. Vijayaraghavan and N. Gokul Raj, "Embedded System Of A Wireless-Based Theft Monitoring", International Journal of Engineering Trends and Technology (IJETT) - Volume4 Issue6- June 2013. .
9. http://www. rfwireless-world. com/Tutorials/Zigbee-protocol-stack. html.
10. Kanchan Kausha, Taranvir Kaur and Jaspinder Kaur, "ZigBee based Wireless Sensor Networks", (IJCSIT) International Journal of Computer Science and Information Technologies, Vol. 5 (6) , 2014, 7752-7755
11. Carles Gomez, Joaquim Oller and Josep Paradells, "Overview and Evaluation of Bluetooth Low Energy: An Emerging Low-Power Wireless Technology", www. mpdi. com/journals/sensors
12. P. Naresh Kumar, Dr. N. S Murthy Sharma, Mr. M. S. Madhan Mohan and Mr. Dhana Raj, "Design and Implementation of Arm Intelligent System Using Zigbee".
13. Frank Vahid and Tony Givargis, " Embedded System Design:A Unified Hardware/Software Approach", http://www. cs. ucr. edu/~Vahid.
14. Ashwin Bhandekar, S. S. Thakare and D. S. Chaudhar, " A Review on Effectuation of Serial Communication Inter-IC Protocol", International Journal of Advanced Research in Computer Science and Software Engineering, Volume 3, Issue 3, March 2013
15. Ms. Reshma Sultana, Ms. Seema Sultana and Mr. Mohammad Osman,"Design and Implementation of a Teacher-Student Interaction System Based On ZIGBEE and RFID", Int. Journal of Engineering Research and Applications", Vol. 4, Issue 1 (Version 1), January 2014, pp. 307-311
16. Dr. Quazi Farheen and Dr. N. V. Kalyankar, "Embedded Systems: Zigbee Based Advanced Controlling System", International Journal of Advanced Research in Computer and Communication Engineering,Vol. 2, Issue 1, January 2013
17. https://sites. google. com/ste/xbeetutorial/zbee-introduction/zigbee
18. V. Ramya and B. Palaniappan, "Web Based Embedded Robot For Safety and Security Applications Using Zigbee", International Journal of Wireless & Mobile Networks (IJWMN) Vol. 4, No. 6, December 2012
19. Hemanth Kumar G and Manjunath lakkannavar. , "The Design of Granary Environmental Monitoring and Control System Based On ARM9 and ZIGBEE", International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-1, Issue-3, August 2012
20. Thoraya Obaid, Haliemah Rashed, Ali Abu El Nour, Muhammad Rehan, Mussab Muhammad Saleh and Mohammed Tarique, "ZIGBEE Based Voice Controlled Wireless Smart Home System" International Journal of Wireless & Mobile Networks (IJWMN) Vol. 6, No. 1, February 2014
21. Andrea Gold Smith, "Wireless Communications".
22. Baoye Song, Xiao Lu and Xingzhen Bai, "Zigbee Based Wireless Sensor and Actuator Network for Service Robot Intelligent Space", College of Information and Electrical Engineering, Shandong University of Science and Technology, Qingdao, Chi

Zigbee Pan Ieee 802. 15. 4 Wlan Mesh Topology