The Develop Of Wireless Temperature Collecting System Based On NRF905 RF Chip

Along with the constant development of the society,more and more data transmission equipments are appearing in all kinds of occasions.Traditional lineate transmission manner,which has some problems such as difficult to route, expensive to preserve and so on,therefore,people expect there is a better solution.Because the wireless communication technique has the advantage such like needn't to route,convenient to carry and cheap to maintain,so it is widely used in many places.The realization of wireless communication technique is much easier as the quickly development of radio frequency(RF) and integrated circuit,the data transmission speed is also much faster than bofore,and will achieve the cable level.The paper designs and realizes a wireless data collecting system,which is based on the nRF905 and AT89C52.The main research content and results in the paper is as follows:(1) The paper introduces the background and significance of the research subject and reviews researches on wireless home and abroad, it also discusses the basic theories and methods related to the object, including basic conception wireless transmission,basic theories and methods related to the wireless transmission and theory on Frequency-Hopping Spread Spectrum(FHSS).(2) Throughout comparing with the merits and drawbacks of several mainstream wireless transmission technique,RF technique is adopted in paper,and the paper chooses the appropriate wireless RF chip and control chip.(3)Developed the system's hardware and software,according the external interference problem in the practice transmission,put forward selecting the FHSS technology to solve.Made some field tests,achieve expected results,proves that using the FHSS technology could solve interference problem efficiently.