1 Introduction
In the ever-changing 21st century, household electronic products have developed rapidly. Many household electrical appliances tend to be humanized and intelligent, and most of these electrical appliances contain CPU controllers or single-chip microcomputers. With a series of advantages such as high reliability, high cost performance, low voltage and low power consumption, single-chip microcomputers have been rapidly developed and widely promoted in recent years, and are widely used in industrial control systems, communication equipment, daily consumer products and toys. And it has penetrated into all aspects of industrial production and all aspects of people's lives, such as workshop assembly line control, automation systems, etc., intelligent household appliances (refrigerators, air conditioners, color TVs), etc. Small household appliances controlled by a single-chip microcomputer are portable, practical and easy to operate.
The electronic perpetual calendar designed in this article is a small smart home electronic product. Using single-chip microcomputer for control, real-time clock chip for time keeping, plus power-down storage circuit and display circuit, time adjustment and display can be realized. The electronic perpetual calendar can be widely used in homes, and can also be used in the halls of banks, posts and telecommunications, hotels, hospitals, schools, enterprises, shops and other related industries, as well as unit meeting rooms, guards and other places. Therefore, this design has very important practical significance and practical value.
2 System overview
This design uses AT89S52 single-chip microcomputer as the core, constitutes a single-chip control circuit, combines DS1302 clock chip and 24C02FLASH memory, displays the solar calendar year, month, day, week, hour, minute, second and lunar calendar year, month, day, and displays the lunar calendar When the time is time, it can indicate whether the leap month is or not, and at the same time complete their automatic adjustment and power-down protection, and all information is displayed by liquid crystal. The man-machine interface is realized by three buttons. With these three buttons, the time and date can be adjusted, and the alarm switch can be set. The software control program realizes all functions. The whole circuit uses +5V regulated power supply, which can work stably. The system block diagram is shown in Figure 2-1. Its software and hardware design is simple, time recording is accurate, and it can be widely used in long-term continuous display systems.
Thanks
Unconsciously, the 12-week graduation project is over. My graduation thesis has been sorted out and the circuit debugging is progressing well. The completion of the graduation project means that my university study life is about to end. From then on, I will enter a new life journey and start a new life-work. Here, I sincerely thank everyone who helped me during my graduation project.
First of all, I want to thank my instructor Li Jie for his great help and support. Throughout the design process, Mr. Li guided me in the overall situation of each process of my graduation design, and took time out of his busy schedule to answer questions for me, and help me analyze and explain the problems encountered in the graduation design. Not only that, but Mr. Li selflessly provided me with abundant learning resources and a good learning environment, which brought great convenience to my graduation project. At the same time, I have provided a lot of guiding opinions in the process of completing my graduation project, which has benefited me a lot. In addition, Mr. Li's profound knowledge, rigorous academic attitude and personal conduct have given me a lot of education, which will benefit me for life. Here, I sincerely thank Mr. Li for his help and education.
In addition, I would also like to thank Mr. Hu Jianming and classmate Chen Haishan for their selfless help. They gave me tremendous help in the process of programming and debugging. Here, I sincerely thank them.
Finally, I would like to thank my alma mater, Tianjin Institute of Engineering and Technology, which left me with wonderful memories during the school. Especially when I was about to set foot on the job, the whole process of graduation design gave me such an opportunity to exercise, which made me deepen my understanding and consolidation of previous knowledge, broaden my knowledge and improve my knowledge of what I have learned. Comprehensive application capabilities. I want to say to my alma mater: my alma mater has been there for three to five years, and I have loved my alma mater for ten thousand years. I wish the alma mater a better future!
