Design And Implementation Of Dada Transmission Unit For 2.4G Wireless Security Alarm System

With the improvement of living standards, demand for quality of life is gradually improving.Burglar alarm system can replace the manual duty,Let humans have more time to work, leisure and tourism, etc.,it’s more reliable than human beings. Compared to the cable burglar alarm system, wireless burglar alarm system reduces the amount of wiring, reduce the cost of the project, more beautiful and convenient to install.With the increase of wireless devices,the wireless interference is becoming more and more serious in the environment. The traditional wireless burglar alarm system can only transmit data in one direction,The sender and receiver can only work at a fixed frequency, anti disturbance is very poor, the reliability of data transmission is getting lower and lower. Therefore, with the dual direction data transmission function and the software frequency hopping technology wireless burglar alarm system becomes the market the most urgent need.This scheme uses 8051 single chip microcomputer as the software running platform, software design using C language.Compared with the traditional wireless burglar alarm system,2.4GHz(Gigahertz) wireless data transmission unit transmitter and receiver are integrated together, when the data sender transmits the data out, if a certain amount of time has not received a confirmation signal from the receiver, the sender will automatic retransmission of data, to ensure that the receiver can receive data.2.4GHz wireless data transmission unit uses the software frequency hopping technology, when the other wireless devices send the same frequency signal, the sender and the receiver will attempt switch frequency according to the set protocol, until find a clean frequency to continue to send and receive data.Because the 2.4GHz wireless data transmission unit uses the integrated design of transmitter and receiver, through the software can achieve frequency hopping, The reliability of data transmission of the wireless burglar alarm system has been greatly improved, almost the same with the cable burglar alarm system.