12-12-2012, 05:12 PM
DESIGN & IMPLEMENTATION OF TEACHER STUDENT INTERACTION SYSTEM USING ZIGBEE & RFID
DESIGN & IMPLEMENTATION.pdf (Size: 263.72 KB / Downloads: 94)
Abstract:
Research of the past years has led to numerous novel developments and approaches for wireless sensor networks
(WSNs). However, most previous work has focused on either mathematical analysis or theoretical algorithms with extensive
simulation results. In this paper, in order to realistically understand the complexity of WSNs, a ZigBee/IEEE 802.15.4
platform has been designed and implemented. Based on an IEEE 802.15.4 radio and ZigBee protocol stack, the developed
ITRI ZBnode is an autonomous wireless communication and computing platform aimed at fast prototyping and research in
WSNs. The platform attempts to provide a low data rate, low power, and low cost wireless networking on the device-level
communication. Finally, examples of tree and mesh network formation are provided to demonstrate practicability of the
developed ZBnode platform.
INTRODUCTION
In recent years, RFID technology in the logistics field
has been widely adopted, it is recognized as one of
the industry's most important industry and application
technology in this century. The unique function of
RFID is to mark any thing or person of the real world,
in the virtual world of network; it has three functions
as "tag", "address number" and "sensing". A wireless
sensor network (WSN) is composed of hundreds or
even thousands of such sensor nodes which use
wireless links to perform distributed sensing tasks. we
implemented a protocol stack of ZigBee using
method of module dividing. From the perspective of
improving teaching methods, combining teaching
practices, a teacher-student interaction system based
on ZigBee and RFID technology was designed and
implemented for the application of actual teaching.
Results show that the system achieved the basic
functions of a teacher-student interaction system.
Sensors come in many types to monitor a wide
variety of conditions, such as the temperature,
humidity, smoke, and light. The variety in types of
sensors has received intensive research attentions due
to its enormous application potential in environmental
monitoring, military surveillance, biomedical
supervision, and other fields [1]. Since the location of
the sensor nodes may not be known in advance, there
is a demand for the network to coordinate in a
distributed manner, similar to the self-organizing
capabilities of a mobile ad hoc network (MANET).
However, several differences exist between WSN and
MANET as described in the following.
ZIG BEE TECHNOLOGY
ZigBee technology is a kind of uniform technical
standards for short-range wireless communication
technology. Complete ZigBee protocol stack is
formed by the physical layer, media access control
layer, network layer, security layer and application
layer. The physical layer and media access control
layer protocol is the protocol standard
IEEE802.15.4.The network layer and security layer
were developed by the ZigBee Alliance, the
development of application layer can be adjusted
according to the user's own need. The system of
ZigBee module of block diagram shown in Figure 1.
SOFTWARE ARCHITECTURE
The software on the ZigBee wireless sensor network
devices is mainly composed of embedded operating
system software, ZigBee protocol stack and
application program, embedded operating system
kernel provides a simple and efficient task transfers,
interrupt handling and time queue management, also
includes all the underlying hardware driver.
Applications program include serial communications,
RF communications, and signal strength detection. It
uses modular design protocol stack, makes the whole
System-level clear, good scalability, conducive to the
secondary development of ZigBee technology[2].
Stack Design
ZigBee protocol stack to ensure that wireless devices
in the low-cost, low power and low speed network
interoperability. ZigBee protocol stack of different
layers communicate through the service access point,
Most layer has two interfaces: data entity interface
and management entity interface. Data entity
interface goal is to provide top service routine data.
Management entity interface goal is to provide the
mechanisms including access to the upper inside
layer parameters, configuration and data
management. Its basic structure as shown in Table 1.
CONCLUSION
802.15.4 wireless technology, this paper has
presented the implementation of a ZigBee-ready
platform: ITRI ZBnode for WSN applications. In this
paper, the combination of RFID and ZigBee way to
achieve the interaction between students and teachers.
RFID technology used for data acquisition and
transmission, ZigBee wireless transmission module
using a star network topology, to achieve the data
from students end to teachers end node for wireless
transmission.