ZigBee protocol based on infrared intrusion detection system design (1)

In the study of wireless sensor network (WSN) and on the basis of the ZigBee Protocol, introduced a ZigBee technology for infrared intrusion detection system design.

The programme with the ZigBee technology for short-range wireless communication advantages, the use of Microchip company radio chip MFR24J40, using active infrared intrusion detector enables real-time intrusion detection of objects and call the police.

In recent years with the development of technology and it security awareness, based on infrared technology's intrusion detection and alarm technology has been applied to the anti-theft system [1].

Existing infrared intrusion detection system for the use of wired networking technology. The disadvantage of such programmes is to scale performance difference, wiring, when the aging or subjected to wear line, the high rate of false alarms. Wireless transmission of wireless intrusion detection network you can avoid these problems. In contrast, a wireless way more flexible and can adapt to mobile or changing needs. However, wireless communication technology in the security field application relative or very small.

Wireless sensor network (WSN) is information perception and acquisition of a revolution, because of its deployment flexibility, easy maintenance, etc. and in the environment, events, control, and many other aspects of the prospect has a broad application.

ZigBee technology is a short-range, low complexity, low power, low data rate, low-cost two-way wireless communication technologies [2], you can embed all kinds of equipment, while supporting the geolocation feature.

Relative to existing wireless communication technology, the ZigBee technology with ultra-low power consumption and cost characteristics, suitable for hosting the data flow with the smaller business, so the ZigBee technology is ideal for use in wireless sensor network-related applications.

This article in research on the basis of the ZigBee Protocol, introduced a ZigBee protocol based on active infrared intrusion detection system design programme, which has better scalability and low false alarm rate.

1 system design plan

As shown in Figure 1 as a building-layer, the layer 8 monitoring points (room).

To address this situation, the system can be a star structure network. The entire system consists of a wireless infrared intrusion detection node, regulator node, monitoring host and PC. Which, in each room to install a wireless infrared intrusion detection node as a terminal node security monitoring room, and regularly sending a security status signal to the modulator. Regulator node as a whole network of central node, is responsible for building the network, receive terminal devices (infrared intrusion detection node) to join the network and data transport and forwarding. Measure and control the host is also a terminal device, but with wireless infrared intruder node, it is responsible for receiving regulator sent through the serial port monitor is sent to the PC. On your PC real-time view into the monitoring point security status, when the object's invasion, alarm device and immediately start on PC display invaded the room number, security personnel can react quickly.

If you want to monitor is a multi-story building or community, you can use the tree topology network, each layer or each one coordinator that is responsible for collecting data, and the central coordinator for Exchange of data and the data forwarded to the monitoring host.

2 the design of the hardware node

[1] [2] [3] [4]