Single chip microcomputer has penetrated into every field of life, it is difficult to find out which field has no trace of single chip microcomputer. The missile navigation device controls various instruments on the aircraft, computer network communication and data transmission, real-time control and data processing of industrial automation process. The microcontroller is widely used in the field of intelligent management and process control, instrumentation, home appliances, medical equipment, aerospace, special equipment. In recent years, with the rapid development of electronic information industry, as the basic component of relay, it is widely used in home appliances, communications, automobiles, instruments, mechanical equipment, aerospace automation and control fields. Recent statistics show that relay has become the first product among electronic components. The circuit of the relay controlled by single chip microcomputer can be seen everywhere in our life. Small components play an infinite role. Based on the design concept of easy to realize, easy to operate and close to life, this paper adopts AT89C51 single-chip microcomputer as the control core, as the control terminal, and uses keys to control ret24005f relay, so as to control the light.<br>
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