基于DS18B20的51單片機(jī)控制恒溫箱.

1、#i nclude"reg51.h"sbit DQ =P 1八4; 定義通信端口sbit add_le=PMO;/顯示地址鎖存sbit data_le=P 1八1;/顯示數(shù)據(jù)鎖存sbit led_key =卩1八3;/指示當(dāng)前顯示溫度狀態(tài) 亮表示為按鍵滅表示為當(dāng)前sbitlight_ctrl = P 1八5; /AC 燈控制un sig ned char inrup=0x00;char dis6;code un sig ned char table16 = 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff,0x00

2、,0xff,0x00,0xff,0xbf;char key_data = 25;char temp_ now ;延時(shí)函數(shù)void delay (un sig ned int i)while(i-);初始化函數(shù)In it_DS18B20(void)un sig ned char x=0;DQ = 1; /DQ 復(fù)位- - 一血T.L4I柄二-hrtt:nr汽2delay(8); 稍做延時(shí)DQ = 0； /單片機(jī)將DQ拉低delay(80); 精確延時(shí)大于480usDQ = 1; /拉高總線delay(14);x=DQ; /稍做延時(shí)后如果x=0則初始化成功x=1則初始化失敗delay(20);讀一

3、個(gè)字節(jié)ReadO neChar(void)un sig ned char i=0;un sig ned char dat = 0;for (i=8;i>0;i-)DQ = 0; /給脈沖信號(hào)dat>>=1;DQ = 1; /給脈沖信號(hào)if(DQ)dat|=0x80;delay(4);return(dat);寫一個(gè)字節(jié)Write On eChar( un sig ned char dat)un sig ned char i=0;for (i=8; i>0; i-)DQ = 0;DQ = dat&0x01;delay(5);DQ = 1;dat>>=1;

4、讀取溫度ReadTe mp erature(void)un sig ned char a=0;un sig ned char b=0;un sig ned int t=0;float tt=0.0;In it_DS18B20();Write On eChar(0xCC); /跳過(guò)讀序號(hào)列號(hào)的操作WriteO neChar(0x44); / 啟動(dòng)溫度轉(zhuǎn)換In it_DS18B20();Write On eChar(0xCC); /跳過(guò)讀序號(hào)列號(hào)的操作WriteO neChar(0xBE); /讀取溫度寄存器等(共可讀9個(gè)寄存器)前兩個(gè)就是溫度 a=Read On eChar();b=Read O

5、n eChar();t=b;t<<=8;t=t|a;tt=t*0.0625;/t= tt*10+0.5; /放大10倍輸出并四舍五入-此行沒(méi)用return(t);void in t_it0(void) interrupt 0delay(1500);light_ctrl = 0;key_data+;if(key_data>125)key_data = 125;led_key = 1;inrup=0xff;void in t_it1(void) in terru pt 2delay(1500);light_ctrl = 0;key_data-;if(key_data < -

6、50) key_data = -50; led_key = 1;inrup=0xff;void dis play(void )un sig ned char n;un sig ned char m;m = 0x10;for(n=0;nv4;n+)P3 = P3&0x0f;P3 = P 3|m;delay(1);P2 = tabledis n;m=m<<1;delay(500);void mai n()un sig ned int a;int temp0;EX0 = 1; /允許外部中斷0中斷IT0 = 1; EX1 = 1;IT1 = 1;EA =1; /開(kāi)總中斷 led_

7、key = 0; light_ctrl = 0;add_le = 0;data_le = 0;DQ = 0;while(1)temp O=ReadTem perature();讀溫度 temp_now = temp0*0.0625;if(temp_ no w<=key_data)light_ctrl = 1;elselight_ctrl = 0;if(temp_no w>=0)dis0=14;dis1=temp_now/100%10; dis2=(temp_now/10)%10; dis3=temp_now%10; else/ dis0 = 15;dis1 = 15;dis3=(0

8、-temp_now)%10;dis2=(0-temp_now) /10%10;for(a=0;a<10;a+)disp lay();if(led_key = 1)a=0;for(;a<200;)inrup=0x00;if(key_data >= 0)dis0=14;dis1=key_data/100%10;dis2=(key_data /10)%10;dis3=key_data%10;else/ dis0 = 15;dis1 = 15;dis3=(0-key_data)%10;dis2=(0-key_data) /10%10;for(a=0;(i nrup !=0xff)&a

9、mp;&(av200);a+)disp lay();led_key = 0;總體描述：數(shù)碼管顯示當(dāng)前溫度和設(shè)定溫度當(dāng)按鍵按下時(shí)，觸犯中斷。進(jìn)行設(shè)定溫度的加減，同時(shí)斷開(kāi)繼電器的觸發(fā)。此時(shí) 數(shù)碼管上顯示的溫度為設(shè)定溫度。發(fā)光二極管D4亮，指示當(dāng)前顯示的為設(shè)定溫度。一段時(shí)間不按鍵時(shí)，程序自動(dòng)跳轉(zhuǎn)回去(否則一直顯示當(dāng)前溫度)，顯示當(dāng) 前溫度，指示發(fā)光二極管D4滅，并開(kāi)始控制。由于51驅(qū)動(dòng)能力有限，故用兩個(gè)三極管驅(qū)動(dòng)繼電器。具體描述：溫度傳感器DS18B20仿真方式：打開(kāi)：顯示當(dāng)前溫度。如下DS18B20顯示溫度為24度按鍵設(shè)置要穩(wěn)定的溫度iiiiiiiiiiiiaiiiiiimllllllll

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