外文翻譯--基于單片機(jī)的學(xué)習(xí)式倒計(jì)時(shí)器(存儲版)
【正文】 ctly 220 V, after 18 V transformer voltage droppings the rectification bridge has given 7805, for monolithic integrated circuit use. Because has red, yellow, the green 3 kind of signal lights, altogether has used 3 18 V transformers, from red, green, the yellow light takes the electricity separately. examine the electric circuit in the study type countdown electric circuit, must the realtime examination traffic light time. Uses the light pair examination in here. When has the signal input, the light pair TIL117 5 feet (C) outputs for the low level signal, examines the low level through the monolithic integrated circuit the time is red candle39。 針對以上要求，采用 C 語言編寫了相應(yīng)控制軟件。 段驅(qū)動電路 位驅(qū)動電路 看門狗電路 看門狗是在程序跑飛或死機(jī)時(shí) 對系統(tǒng)進(jìn)行重新置位或者復(fù)位，以使系統(tǒng)恢復(fù)正常運(yùn)行的一種專用電路。 STC10F04 單片機(jī)是高速、低功耗、超強(qiáng)抗干擾的新一代 8051 單片機(jī)，其指令代碼完兼容傳統(tǒng)的 8051。 電源電路 該倒計(jì)時(shí)器直接從信號燈取電，信號燈電壓為 220 V，經(jīng) 18 V 變壓器降壓后過整流橋送給 7805，供單片機(jī)使用。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。 1 倒計(jì)時(shí)器介紹 道路交通倒計(jì)時(shí)器按控制類型可分為 2 大類，一類是學(xué)習(xí)式倒計(jì)時(shí)器，一類是訊型倒計(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。在這里采用光耦檢測。采用 12 個(gè)高亮 LED模擬 7 段數(shù)碼管的一段。在程序中不到 s 的間隔給出一次喂狗信號，就能夠保證系統(tǒng)正常運(yùn)行時(shí)不會有 RESET 信號輸出，保證單片機(jī)穩(wěn)定工作。中斷子程序完成紅、綠燈時(shí)間的計(jì)時(shí)學(xué)習(xí)功能和顯示倒計(jì)時(shí)功能。s frequency synchronism, but effective reduces the error. driving circuits according to Road traffic To manage Facility Establishment Standard, the countdown demonstrated that is hanging do not be lower than 5 m highly, the pedestrian is apart from the countdown demonstration sign to be generally far, the illumination unit size request is big. Uses 12 Gao Liang LED to simulate 7 sections of nixietubes a section. Because after parallel, may reach over a hundred mA, must add the driving circuit. Each section must use a transistor to actuate, to choose NPN 8050. Each electric current is bigger, selects PNP Darington triode TIP137. This system when demonstration uses two demonstra
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