单片机已经渗入到生活的各个领域，它是很难找到哪些领域没有单片机的痕迹。

SCM has penetrated into all areas of life, it is hard to find areas where there is no trace of the microcontroller. Missile navigation device on the plane to control instruments, computer network communications and data transmission, real-time control and data processing of the industrial automation process. The microcontroller is widely used in the field of intelligent management and process control, instrumentation, home appliances, medical equipment, aerospace, specialized equipment. In recent years, with the rapid development of electronic information industry, as a fundamental part of the relay, widely used in home appliances, telecommunications, automotive, instrumentation, machinery and equipment, aerospace automation and control. Recent statistics show that the relay has become the first major product in the electronic components products. MCU control relay circuit ubiquitous in life, but the effect is infinitely small elements. It based easy to implement, easy to operate, close to the design life used, using AT89C51 microcontroller core, to control the terminal, including buttons and employed to control the relay RET24005F thereby to control the light.

Microcontrollers have infiltrated all areas of life, and it is hard to find areas where there are no traces of microcontrollers. Missile navigation devices, control of various instruments, computer network communication and data transmission, real-time control of industrial automation processes and data processing. The microcontroller is widely used in the field of intelligent management and process control, instrumentation, home appliances, medical equipment, aerospace, specialized equipment. In recent years, with the rapid development of the electronic information industry, as a basic component of relays, widely used in home appliances, communications, automotive, instrumentation, machinery and equipment, aerospace automation and control fields. Recent statistics show that relays have become the number one product in electronic components. The circuit of the microcontroller control relay can be found everywhere in life, small components but the effect is infinite. Based on the design concept of easy to achieve, convenient operation and close to the use of life, the AT89C51 microcontroller is used as the control core, as the control terminal, and the RET24005F relay is used to control the lights.

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>