南京工程学院单片机课程设计《基于DS18B20的测温报警器》

1、 图2 51单片机内部结构 图3 51单片机双列直插封装方式的引脚 I/O口说明： 图4 晶振电路 上电复位 按键复位 图5 51单片机的两种复位电路 DS18B20介绍 2. 引脚封装 图 6 DS18B20引脚封装及定义图 3.硬件连接图7 DS18B20典型电路 4.工作原理图8 64位光刻ROM各位定义 图9 高速暂存器RAM以上这些指令分别涉及DS18B20的ROM和图10 DS18B20内部温度的存储格式 图11 串口通信电路 图12 按键电路 图13 报警电路图14 显示电路74HC595简介:图1574hc595管脚图图16 整体电路图图17 PCB布线图图18 课设实际使用P

2、CB布线图DS18B20工作程序：/*/*程序名：18B20.H */*功能：对ds18b20的控制，时期能够正确检测当前环境实时温度并转换处理温度*/*包括延时函数和温度显示数据的转换函数 */*/#define uchar unsigned char#define uint unsigned intsbit ds=P34; /引脚定义uint temp;float f_temp;uint temperature4=0;void delay (uint count)/延时函数unsigned int i;while (count)i =200;while (i>0) i-;count-

3、; void dsreset (void)/ 发送复位和初始化unsigned int i;ds = 0;i = 103;while (i>0) i-; / 延时ds = 1;i = 4;while (i>0) i-;bit tempreadbit (void)/ 读取数据的一位 uint i;bit dat;ds = 0; i+;ds = 1; i+; i+;/延时dat = ds;i = 8; while (i>0) i-;/ 延时return (dat);uchar tempread (void) /读一个字节uchar i,j,dat;dat = 0;for (i=1

4、;i<=8;i+)j = tempreadbit();dat = (j << 7) | (dat >> 1);return (dat);void tempwritebyte(uchar dat)/写一个字节 uint i;uchar j;bit testb;for(j=1;j<=8;j+)testb=dat&0x01;dat=dat>>1;if (testb)ds=0; / 写0 i+; i+; ds = 1;i = 8; while (i>0) i-; elseds = 0; / 写0 i = 8; while (i>0)

5、i-; ds = 1;i+; i+; void tempchange(void)/ ds1820开始转换 dsreset ();/ 复位delay (1);/ 延时tempwritebyte(0xcc);/ 跳过序列号命令tempwritebyte(0x44); / 发转换命令 44H, uint get_temp(void)/ 读取温度 uchar a,b;dsreset ();/ 复位delay (1);/ 延时tempwritebyte(0xcc); / 跳过序列号命令tempwritebyte(0xbe); / 发送读取命令a = tempread();/ 读取低位温度b = temp

6、read(); /读取高位温度temp=b;temp<<=8;temp=temp|a;f_temp=temp*0.0625;temp=f_temp*10+0.5;f_temp=f_temp*10+0.05;return temp;/返回测量值 void translate(uint t) /显示数据转换函数 temperature0=t/100; temperature1=t%100/10; temperature2=t%100%10; temperature3=1000; 主函数功能程序：/*/*程序名：main hanshu.c */* 功 能：实时测量温度，超过上下限报警，报

7、警温度可手动调整。K1是用来 进行*/上下限调节模式的， 当按一下K1进入上限调节模式，再按一下进入下限调节模式。在正常模式下，按一下K2进入查看上限温 度模式，显示1s左右自动退出；按一下K3进入查看下限温度模式，显示1s左右自动退出；在调节上下限 温度模式下，K2是实现加1功能，K1是实现减1功能。/*/#include <reg52.h> /头文件#include <18b20.h>#include "intrins.h"#define uchar unsigned char/宏定义#define uint unsigned intsbit S

8、T=P14;/74hc595引脚位定义sbit CP=P12;sbit DIN=P13;sbit key1=P15;/按键定义sbit key2=P16;sbit key3=P17;sbit beep=P32;/蜂鸣器定义unsigned char table=0x82,0x9f,0xa4,0x85,0x99,0xc1,0xc0,0x8b,0x80,0x81,0x02,0x1f,0x24,0x05,0x19,0x41,0x40,0x0b,0x00,0x01;/带小数点与否的09段码表uint wendushangxian=36;/初始温度上下限设定uint wenduxiaxian=0;uin

9、t k1,k2;void shuchu()/74hc595输出函数ST=0;_nop_();_nop_();ST=1;_nop_();void shuru(unsigned char a)/74hc595输入函数unsigned char i;for(i=8;i>0;i-)CP=0;a<<=1;_nop_();DIN=CY;CP=1;_nop_();void display()/显示函数 tempchange();get_temp();translate(temp);shuru(tabletemperature2);shuru(tabletemperature1+10);sh

10、uru(tabletemperature0);shuru(0xff);shuchu();void keyscan()/按键扫描函数 if(key1=0) delay(20); if(key1=0) while(!key1);/松手检测 beep=0;/按键声delay(10);beep=1; while(1) if(key2=0) delay(20); if(key2=0) beep=0;delay(10);beep=1; shuru(tablewendushangxian%10);shuru(tablewendushangxian/10); shuru(0xff); shuru(0xff);

11、 shuchu();while(!key2);/松手检测 while(1) if(key2=0) /上限值设置 + delay(20); if(key2=0) wendushangxian+;beep=0;delay(10);beep=1;if(wendushangxian=-1)|(wendushangxian=-2)|(wendushangxian=-3)wendushangxian=0;if(wendushangxian=100)wendushangxian=99;if(wendushangxian<=wenduxiaxian)wendushangxian+;beep=0;dela

12、y(10);beep=1;shuru(tablewendushangxian%10);shuru(tablewendushangxian/10); shuru(0xff); shuru(0xff); shuchu(); while(!key2); if(key3=0) /上限值设置 - delay(20); if(key3=0) wendushangxian-;beep=0;delay(10);beep=1;if(wendushangxian=100)wendushangxian=99;if(wendushangxian<=wenduxiaxian)wendushangxian+;bee

13、p=0;delay(10);beep=1;shuru(tablewendushangxian%10);shuru(tablewendushangxian/10); shuru(0xff); shuru(0xff); shuchu(); while(!key3); /松手检测 if(key1=0) delay(20); if(key1=0) delay(20); break; /确认 if(key3=0) delay(20); if(key3=0) while(1) if(key2=0) /下限值设置 + delay(20); if(key2=0) wenduxiaxian+;beep=0;de

14、lay(10);beep=1;if(wenduxiaxian=-1)|(wenduxiaxian=-2)|(wenduxiaxian=-3)wenduxiaxian=0;if(wenduxiaxian>=wendushangxian)wenduxiaxian-;beep=0;delay(10);beep=1;shuru(tablewenduxiaxian%10);shuru(tablewenduxiaxian/10); shuru(0xff); shuru(0xff); shuchu(); while(!key2); if(key3=0) /下限值设置 - delay(20); if(k

15、ey3=0) wenduxiaxian-;beep=0;delay(10);beep=1;if(wenduxiaxian=-1)|(wenduxiaxian=-2)|(wenduxiaxian=-3)wenduxiaxian=0;if(wenduxiaxian>=wendushangxian)wenduxiaxian-;beep=0;delay(10);beep=1;shuru(tablewenduxiaxian%10);shuru(tablewenduxiaxian/10); shuru(0xff); shuru(0xff); shuchu(); while(!key3); if(ke

16、y1=0) delay(20); if(key1=0) beep=0;delay(10);while(!key1)beep=1; break; if(key1=0) delay(20); if(key1=0) beep=0;delay(10);while(!key1)beep=1; break; warn1(uint k1)/上限报警函数 if(temperature0*10+temperature1)>=wendushangxian) beep=0;delay(k1);beep=1;delay(k1);else beep=1;warn2(uint k2)/下限报警函数 if(tempe

17、rature0*10+temperature1)<=wenduxiaxian)beep=0;delay(k2);beep=1;delay(k2); else beep=1;void guan_baojing()/关报警函数if(key3=0)delay(20);if(key3=0)beep=1;void main()/主函数 k2=200; beep=1; while(1) k1+=5; k2-=5; if(k1=200)k1=0;if(k2=0)k2=200; keyscan();warn1(k1);warn2(k2);guan_baojing();display();数字温度测试系统元件清单序号名称规格封装数量代号1插座双排针座IDC101JP52数码管(共阳)红色0.5英寸SMG0.54DG1DG2DG3DG43排电阻8*5.1KSIP91R184电阻1KAXIAL0.44R1R3R4R55二极管IN4001DIODE0.44D1D2D3D46蜂鸣器5VECAP11FM