1、 外文翻译 频率合成器设计 系 别： 电子与电气工程系 年级专业： 2012 级电子信息工程（专升本） 姓 名： 学 号： 题目名称： 指导老师评语： 指导老师签名： 年 月 日 1 外文翻译 The elevator controller based on Single-chip microcomputer Abstract: the design is based on single-chip microcomputer to control the use of the appliance, the use of digital tube to display the position
2、and direction of the floor, using two LEDs to replace the motor, to achieve the motor positive inversion by single-chip microcomputer to control the LED on and off, to check the position of the elevator through the timer delay. Keywords: Elevator AT89S51 LED motor control floor check 1 Introduction
3、With the rapid development of the continuous improvement of living standards and the national economy. Each big city buildings in continuously to the high-level development. Therefore lift play a decisive role in our life. The elevator is not only the important equipment for the production process,
4、it is a transportation equipment by the people with frequent. Therefore, the elevator control technology is also in constant improvement and perfection, commonly used control technology mainly has two kinds of Technology: Based on PLC control and based on MCU control technology of two. Use the eleva
5、tor PLC control, stable and reliable performance, but the cost is too high. The elevator control can greatly reduce the cost and the operation is reliable based on the elevator control, so now most controlled by single chip microcomputer. 2 of the overall design scheme 2 of the overall design scheme
6、 2.1 design ideas The basic idea of this design is the use of AT89s51 microcontroller as the core, to control the use of its rich interface and peripheral circuit with I/O. Check the position of the timer delay to control the elevator, using 8 bit LED static display to display the elevator location,
7、 and use 74ls245 to drive LED display. The determinant keyboard matrix as the external to internal selection circuit, because it is the 6 floor, the choice of 4 * 4 matrix keyboard. When the elevator arrived at the destination when the motor stops, the passengers can enter, after entering the elevat
8、or, passengers can choose to which a layer, and then the elevator according to the passengers choose to judge which floor, continue to run. Through the single-chip microcomputer to control the elevator in the rising process only in response to the rising call, drop in the process only response to de
9、clining call. The normal operation of the elevator is realized by single-chip 2 microcomputer control. 2.2 of the overall design diagram Fig. 1 overall plans 3Analysis of design principles 3.1Design keyboard matrix circuit Because the circuits required button more in order to save the MCU I/O port,
10、the choice of determinant keyboard matrix. This circuit is used in 4 * 4 keyboard matrix. The circuit shown in Figure 2, the P1.0-P1.7 is connected to the P1 ports of the single-chip, single-chip scanning method used to row and column to distinguish these 16 buttons which key is pressed, and the lab
11、el read accumulator inside A, and then can be controlled by SCM elevator operation according to each button function. The following will each button function explain: S1: a building to call button, the button press said a building with elevator upstairs to SCM, and the signal into a fixed unit, wait
12、 to judge whether the response to this call the elevator to the floor； S2: two buildings to the call button, the button press said the two floor elevator upstairs to, and the MCU will this signal into a fixed unit, wait to judge whether the response to this call the elevator to the floor； S3 : two b
13、uildings down the call button, the button press said the two floor elevator ride down to single chip, and the signal into a fixed unit, wait to judge whether the response to this call the elevator to the floor； S4: on the third floor to the call button, the button press said the third floor has take the elevator upstairs to
