摘要:電子萬年歷是單片機(jī)系統(tǒng)的一個應(yīng)用，由硬件和軟件相配合使用。硬件由主控器、時鐘電路、溫度檢測電路、顯示電路、鍵盤接口5個模塊組成。主控模塊用AT89S52、時鐘電路用時鐘芯片DS1302、顯示模塊用LCD數(shù)碼管、溫度檢測采用DS18B20溫度傳感器、鍵盤接口電路用普通按鍵接上拉電阻完成；軟件利用C語言編程實(shí)現(xiàn)單片機(jī)程序控制。單片機(jī)通過時鐘芯片DS1302獲取時間數(shù)據(jù)，DS18B20采集溫度信號送該給單片機(jī)處理，單片機(jī)再把時間數(shù)據(jù)和溫度數(shù)據(jù)送給74LS154譯碼，然后通過三極管C9015放大驅(qū)動LCD數(shù)碼管顯示陽歷年、月、日、時、秒、鬧鐘、星期、溫度。

關(guān)鍵詞 電子萬年歷；單片機(jī)；溫度傳感器；時鐘；數(shù)碼顯示

Abstract:Electronic perpetual calendar which is an application of the single-chip processor system, is utilized by combining hardware and software. And Hardware is composed of five modules: Main control unit, clock circuit, temperature test circuit, display circuit, keyboard interface. Main control board adopts AT89S52, clock circuit adopts the DS1302 clock chip, display module adopts the LCD digital tube, and temperature test adopts the DS18B20 temperature sensor, keyboard interface circuit is completed by connecting ordinary button with pull-up resistor. Software takes advantage of C to program, so as to realize the programmed control of single-chip processor. Single-chip processor gets the time data through using the DS1302 clock chip. The DS18B20 gathers temperature signals and transmits them to single-chip processor. Then, single-chip processor transmits the time data and the temperature data to the 74LS154 decoder. Lastly, the LCD displays solar calendar year, year, month, day, hour, minute, second, alarm clock, week and temperature with being enlarged and driven by the C9015 triode.

Keywords  Electronic perpetual calendar  single-chip processor  temperature sensor  clock  digital display

　　　二十一世紀(jì)是電子科技高速發(fā)展的時代，其中單片機(jī)扮演著不可或缺的角色。電子萬年歷的研究和發(fā)展在當(dāng)今時代仍是一項(xiàng)不斷探索的課題。因?yàn)樗鼜V泛應(yīng)用于人們的日常生活，在學(xué)校，企事業(yè)單位，辦公大廳，車站廣場等場所遍及它們的足跡，融于社會各個角落，滿足人們各項(xiàng)基本生活需求，同時給社會管理帶來了極大的便利。

　　　 本課程設(shè)計硬件由主控器，時鐘電路，溫度檢測電路和顯示電路幾個模塊組成。主控模塊用AT89S52單片機(jī)，時鐘電路用時鐘芯片DS1302，顯示模塊用LCD液晶顯示，接口比較簡單，斷電不會失去時間和數(shù)據(jù)信息，功耗低，性能高，解決了目前常用實(shí)時時鐘占有單片機(jī)資源多以及計時不可靠等缺點(diǎn)。在很多領(lǐng)域應(yīng)用中，特別是對時鐘精確性和可靠性有較高要求的場合，具有很高的應(yīng)用價值。