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外文翻譯--基于單片機(jī)的學(xué)習(xí)式倒計(jì)時(shí)器-資料下載頁

2025-05-12 07:25本頁面

【導(dǎo)讀】結(jié)構(gòu)簡單、工作可靠的優(yōu)點(diǎn)。硬件電路圍繞STC10F04XE搭建,由單片機(jī)I/O口。給出控制信號,驅(qū)動(dòng)倒計(jì)時(shí)顯示。根據(jù)學(xué)習(xí)式倒計(jì)時(shí)顯示的特點(diǎn),編寫了指令以。實(shí)現(xiàn)系統(tǒng)運(yùn)行所要求的功能。間,注意路口交通狀況。倒計(jì)時(shí)顯示屏配合信號指示燈具使用,用于城市交叉路。備,適用于城鎮(zhèn)道路交叉口,高速公路,高架橋梁等。是訊型倒計(jì)時(shí)器,該類倒計(jì)時(shí)器均在定周期的信號控制模式下使用。該系統(tǒng)具有以下特點(diǎn):①設(shè)計(jì)為獨(dú)立模塊,采用自學(xué)式工。系統(tǒng)安裝靈活,模塊化、結(jié)構(gòu)化、擴(kuò)展性良好,運(yùn)行安全。系列)、整流電源電路、檢測電路、看門狗電路、驅(qū)動(dòng)電路、LED顯示電路等。人距倒計(jì)時(shí)顯示牌一般較遠(yuǎn),發(fā)光單元尺寸要求較大。采用12個(gè)高亮LED模擬7. 由于并聯(lián)后可達(dá)上百mA,必須加驅(qū)動(dòng)電路。該系統(tǒng)在顯示時(shí)采用兩位顯示,使用2個(gè)TIP137,分別驅(qū)動(dòng)個(gè)位和十位。針對不同交通路口顯示要求,有99s,40s,20s,10s倒計(jì)時(shí)顯示方式,狀態(tài)的時(shí)間及顯示應(yīng)不超過2個(gè)信號周期,在學(xué)習(xí)期間倒計(jì)時(shí)器應(yīng)顯示黑屏。

  

【正文】 ike chart 6 (a) shows, watchdog electric circuit connection like chart 6 (b) shows. Less than s gaps give in the procedure one time feed the dog signal, can when the guarantee system normal operation will not have the RESET signal output, will guarantee the monolithic integrated circuit steady work. (a) MAX813L pin (b) watchdog electric circuit connection pattern selecting circuit In view of the different transportation street intersection demonstration request, some 99 s,40 s,20 s, 10 s countdown display mode, uses dials evenly dials the code switch to realize the pattern choice. 3 system software design basis concerned requirements, when the road traffic signal cybertron starting, the signal period has the change or the road traffic signal cybertron changes over to the hand control by the automatic control, the study type countdown should enter the study condition. The study condition39。s time and the demonstration should not surpass 2 signal periods, should demonstrate the black screen in the study countdown. After the road traffic signal cybertron interrupt output or changes over to yellow dodges the control, the countdown ought to be able in the current signal phase closure time to demonstrate the black screen. In view of the above request, used the C language to pile corresponding control software. Software design main flow as shown in Figure 8. The system can study the signal light time, the study black screen, demonstrates the corresponding countdown time in the corresponding signal bright time interval, when the yellow light is bright closes the demonstration. Can through dial the code switch choice different display mode. The interrupt subroutine pletes red, the green time time study function and demonstration countdown function . Interrupt subroutine flow chart like chart 9.
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