多功能數(shù)字時鐘

摘  要：
隨著電子技術(shù)的發(fā)展，在諸如計時、控制等領(lǐng)域，設(shè)計出應(yīng)用具有時間設(shè)置（小時和分鐘），鬧鐘時間設(shè)置，鬧鐘開、關(guān)功能的多功能數(shù)字鐘具有十分重要的意義。數(shù)字鐘有顯示小時、分鐘，有AM、PM指示器，鬧鐘就緒燈，蜂鳴器等。能實現(xiàn)鍵盤控制切換現(xiàn)場環(huán)境溫度顯示（0～60℃ 1℃），切換電網(wǎng)頻率、電壓顯示，電壓欠壓、過壓報警（～220V 10％），非接觸止鬧等功能。該多功能數(shù)字鐘具有顯示年、月、日、星期、時、分、秒、溫度及對各日期信息的調(diào)整功能；每天三點定時鬧鐘、日期提醒、鬧鈴音樂選擇、掉電保護控制功能，此外除通過干電池供電外，還能通過MP3變壓由USB線直接可用220V交流供電。主要采用STC89C52作為主控芯片，由DS1302產(chǎn)生時鐘信號，由DS18B20溫度傳感器采集溫度信號，并在LCD上顯示時間、溫度等信息，測溫精度可達(dá)0.1度，整個時鐘通過菜單的形式實現(xiàn)各個功能，界面友好、直觀，易于操作。

關(guān)鍵詞：電子時鐘，多功能，顯示，DS18B20，DS1302 

Abstract:
With the development of electronic technology, such as timing, control and other areas, design application with the time setting (hours and minutes), alarm clock time setting, alarm clock, off the multi-functional digital clock is of great significance. Digital clock showing hours, minutes, with AM, PM indicator, alarm clock ready lights, buzzer and so on. To achieve control over the keyboard to switch the site displays the ambient temperature (0 ~ 60 ℃ 1 ℃), switching power grid frequency, voltage display, voltage, undervoltage, overvoltage alarm (~ 220V 10%), non-contact only the downtown and other functions. The multi-functional digital clock with a display year, month, day, week, hours, minutes, seconds, temperature and date information on the adjustment of the various functions; 3:00 regular daily alarm, date reminder, alarm music selection, power-down protection control function, in addition to, inter alia through the dry battery power supply, but also through the USB cable directly to MP3 transformer is available from the 220V AC power. STC89C52 used mainly as a master chip, the clock signal generated by the DS1302 from the temperature sensor DS18B20 collecting temperature signal, and the LCD displays time, temperature and other information, temperature measurement accuracy of up to 0.1 degrees, the entire clock is achieved through the menu in the form of various functional friendly interface, intuitive, easy to operate.
Keywords: electronic clock; multi-function; show; DS18B20; DS1302

 
目 錄
緒論 1
1設(shè)計要求與方案論證 2
1.1設(shè)計要求 2
1.1.1基本要求 2
1.1.2發(fā)揮部分 2
1.2系統(tǒng)基本方案選擇和論證 2
1.2.1芯片的選擇 2
1.2.2顯示模塊選擇方案和論證 2
1.2.3時鐘信號的選擇方案和論證 2
1.2.4測溫元件的選擇方案與論證 2
1.3 電路設(shè)計最終方案決定 3
2系統(tǒng)的硬件設(shè)計與實現(xiàn) 3
2.1 電路設(shè)計框圖 3
2.2 系統(tǒng)硬件概述 3
2.3 硬件電路結(jié)構(gòu)的設(shè)計 3
2.3.1 單片機主控模塊的設(shè)計 3
2.3.2時鐘電路模塊的設(shè)計 4
2.3.3溫度采集模塊設(shè)計 4
2.3.4 顯示模塊的設(shè)計 5
2.4電路原理及說明 5
2.4.1 時鐘芯片DS1302的原理： 5
2.4.2溫度傳感器18B20的測溫原理： 7
3系統(tǒng)的軟件設(shè)計 7
4 功能的調(diào)試 8
4.1硬件調(diào)試 8
4.2軟件調(diào)試 8
5指標(biāo)測試 9
5.1 測試儀器 9
5.2掉電保護時間測試 9
5.3溫度測試 9
6測試結(jié)果分析與結(jié)論 9
6.1 測試結(jié)果分析 9
6.2作品功能測試總結(jié) 9
附錄 12
附錄一、系統(tǒng)電路圖 12
附錄二、程序清單 13