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This article uses the nRF905 to realize wireless door access systems.To enhance thesafety by using DS1722 for random data, the IDEA encryption arithmetic, delay some time when receive illegal data. The paper main introduces the hardware design, the nRF905 wirelesstransmission, the IDEA algorithm and its detailed Keil c program.Keywords: Wireless transmission; IDEA-Algorithm; Door access system; Safe0 Introduction
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