英语海报

Design Scheme
This design USES the single chip microcomputer as the core control components, makes the reliability of the circuit is higher, the function is more powerful, and can update the system, at any time under different condition combination. The system adopts single chip microcomputer AT89C51 as the core of this design element, use of section 7 of the Yin leds as display devices. Access to a total of Yin LED display, can display, minutes, seconds, MCU peripheral has the timing alarm system, time to time, by sending alarm, prompt preset appliances start-stop time to time, to control the start-stop of the electrical appliances. Alarm system depends on the timing of a single chip microcomputer software and hardware, the hardware is based on software, software is the kernel of hardware. Design hardware circuit should design a SCM smallest system, it is the basis of single chip microcomputer application system design, and then on the basis of adding peripheral devices, such as display, buttons and other hardware circuit diagram of the alarm clock. During application design follows a modular design method, after clear the design direction according to draw the flow chart is divided into several big modules, respectively, and then write this, according to the flowchart respectively after each module written to debug, modify and perfect. Finally, in the main program with debug, modify again.
Program Flow Chart
References
[1] Liu Yongjun.SCM Control of LED Dot Matrix Display Principle and Proteus simulation.Computer Knowledge and Technology,27:21-24,2010. [2] Feng Xu, Wang Gang. The Dynamic Display of Chinese Dot Matrix Based on Proteus and Assembly Language.Electronic Technology,8:36-39,2010.
Results
The system software programs are the main program module, timing interrupt service program, interrupt waiting for service program, service program, keyboard display subroutine of service program and so on six big modules.
The Design Of The Electronic Clock
YuPing Bai Liaoning Project Technology University
Biblioteka Baidu
Introducetion
This design is simple timing alarm system, not only can realize the function of the system requirements: (1) can show all the time - hoping to seconds seconds, can set up and modify time regularly, (2) (3) time after time to can send out alarm; And there are additional features that can set and modify the current shown in the time. This design USES the single chip microcomputer AT89C51 as a core element, 12 MHZ crystal vibration, by P0 port output to display the glyph segment code, the P2 output a signal. On the basis of the extended peripheral chips and circuit, additional clock circuit and LED circuit. LED by common cathode connection, the low level to select the corresponding LED effectively. Single chip has high integration, strong function, good generality, especially its low energy consumption, low price, high reliability, strong anti-interference ability and easy to use and other unique advantages, so the single chip microcomputer is now widely used in household appliances, mechanical and electrical products, children's toys, robot, office automation products and other fields. In order to further familiar with and master the application of single-chip microcomputer and development, seriously do a good job in the curriculum design is very necessary.