基于51单片机的温度检测系统程序及仿真(共6页).doc

精选优质文档-倾情为你奉上/*/*用DS18B20进行测量,lcd1602显示*/*#include "reg51.h"#include "intrins.h"#define uchar unsigned char#define uint unsigned intuchar code table1 ="ID: " /欢迎显示，包括空格在内<=16uchar code table2 ="Name: "/欢迎显示，包括空格在内<=16uchar code str1 =" Temperature " uchar code str2 =" "/*管脚定义*sbit lcd_rs = P30; /液晶数据命令选择端sbit lcd_en = P31; /液晶使能sbit DQ = P36; /液晶使能/*参数定义*uint tvalue;/温度值uchar tflag;/温度正负标志uchar data disdata5;/*子函数定义*void delay(uchar z); /delay延时子程序void init_lcd(); /LCD1602初始化函数void write_com(uchar com); /LCD1602写指令函数void write_data(uchar date); /LCD1602写数据函数void lcd1602_display(uchar *q,uchar *p);/LCD1602显示函数void welcome(); /LCD1602显示欢迎函数void delay_DS18B20(uint i); /delay_DS18B20函数void Init_DS18B20_display(); /DS18B20初始化显示void Init_DS18B20(); /DS18B20初始化uchar ReadOneByte(); /DS18B20读一字节void WriteOneByte(uchar dat); /DS18B20写一字节Read_Temperature(); /DS18B20读取温度值并转换void DS18B20_display(); /DS18B20温度显示/*主函数*void main()welcome();delay(2000);Init_DS18B20_display();while(1)Read_Temperature();DS18B20_display(); /*delay延时子程序*void delay(uchar z)uchar x,y;for(x=0;x<z;x+)for(y=0;y<114;y+);/*LCD1602初始化函数*void init_lcd()write_com(0x38); /设置16*2显示，5*7点阵，8位数据接口write_com(0x08); /写一个字符后地址指针加1 write_com(0x01); /显示清零，数据指针清零write_com(0x06); /写一个字符后地址指针加1write_com(0x0c); /关显示，光标不显示不闪烁/*LCD1602写指令函数*void write_com(uchar com)delay(5);lcd_rs = 0; / 选择写指令lcd_en = 0; / 将使能端置0P2 = com; / 将要写的命令送到数据总线上delay(5); / 延时5ms，待数据稳定lcd_en = 1; / 由于初始化已将lcd_en置为0，使能端给一个高脉冲，delay(5); / 延时5ms，待数据稳定lcd_en = 0; / 将使能端置0以完成脉冲/*LCD1602写数据函数*void write_data(uchar date)delay(5);lcd_rs = 1; / 选择写数据lcd_en = 0; / 将使能端置0P2 = date; / 将要写的数据送到数据总线上delay(5); / 延时5ms，待数据稳定lcd_en = 1; / 由于初始化已将lcd_en置为0，使能端给一个高脉冲，delay(5); / 延时5ms，待数据稳定lcd_en = 0; / 将使能端置0以完成脉冲/*LCD1602显示函数*void lcd1602_display(uchar *q,uchar *p)write_com(0x80); / 现将数据指针定位到第一行第一个字处while(*q!='0')write_data(*q);q+;delay(1);write_com(0xc0); / 现将数据指针定位到第二行第一个字处while(*p!='0')write_data(*p);p+;delay(1);/*LCD1602显示欢迎函数*void welcome()init_lcd();lcd1602_display(table1,table2);delay(5000); /*DS18B20初始化显示*void Init_DS18B20_display()init_lcd();lcd1602_display(str1,str2); /*LCD1602显示函数*void delay_DS18B20(uint i)while(i-);/*DS18B20初始化*void Init_DS18B20()DQ = 1; /DQ复位delay_DS18B20(4); /延时DQ = 0; /DQ拉低delay_DS18B20(100); /精确延时大于480usDQ = 1; /拉高delay_DS18B20(40);/*DS18B20读一字节*uchar ReadOneByte()uchar i,dat = 0;for(i=8;i>0;i-)DQ = 0;/给脉冲信号dat>>=1;DQ = 1; /给脉冲信号if(DQ) dat|=0x80;delay_DS18B20(10);return (dat);/*DS18B20写一字节*void WriteOneByte(uchar dat)uchar i;for(i=8;i>0;i-)DQ = 0;DQ = dat&0x01;delay_DS18B20(10);DQ = 1;dat>>=1;/*DS18B20读取温度值并转换*Read_Temperature() uchar a,b; Init_DS18B20(); WriteOneByte(0xcc); /跳过读序列号 WriteOneByte(0x44); /启动温度转换 Init_DS18B20(); WriteOneByte(0xcc); /跳过读序列号 WriteOneByte(0xbe); /读取温度 a = ReadOneByte(); b = ReadOneByte(); tvalue=b; tvalue<<=8; tvalue=tvalue|a; if(tvalue<0xfff)tflag = 0;elsetvalue = tvalue+1;tflag = 1;tvalue = tvalue*(0.625); /温度值扩大10倍，精确到1位小数return (tvalue);/*DS18B20温度显示*void DS18B20_display()uchar flagdat;disdata0=tvalue/1000+0x30; /百位数disdata1=tvalue%1000/100+0x30;/十位数disdata2=tvalue%100/10+0x30; /个位数disdata3=tvalue%10+0x30; /小数位if(tflag = 0)flagdat = 0x20; /正温度不显示符号elseflagdat = 0x2d; /负温度显示负号if(disdata0 = 0x30)disdata0 =0x20;/如果百位为0，不显示if(disdata1 = 0x30)disdata1 =0x20;/如果百位为0，十位为0也不显示write_com(0xc4);write_data(flagdat); /显示符号位write_com(0xc5);write_data(disdata0);/显示百位write_com(0xc6);write_data(disdata1);/显示十位 write_com(0xc7);write_data(disdata2);/显示个位write_com(0xc8);write_data(0x2e); /显示小数点write_com(0xc9);write_data(disdata3);/显示小数位专心-专注-专业