读取DS18B20温度,通过LCD1602显示出来,并输出控制汇总

1、电路原理图程序K1=P20; sbit K2=P21; sbit K3=P22; sbit K4=P23; extern int th=20; extern int tl=-10; sbit beep=P10;void main()LcdInit();LcdWriteCom(0xc7);LcdWriteData('C');while(1)if(K1=0)Delay1ms(500);if(K1=0);th+;if(K2=0)Delay1ms(500);if(K2=0);th-;if(K3=0)Delay1ms(500);if(K3=0);tl+;if(K4=0)Delay1ms(

2、500);if(K4=0);tl-;LcdDisplay(Ds18b20ReadTemp();void LcdDisplay(int temp)int i,tt,rr,mm;unsigned char datas = 0, 0, 0, 0,datas1 = 0, 0, 0,datas2 = 0, 0, 0;float tp;if(temp< 0)LcdWriteCom(0xc0);LcdWriteData('-');i=1;temp=temp-1; temp=temp; tp=temp; temp=tp*0.0625*10+0.5; mm=-temp;elseLcdWri

3、teCom(0xc0);LcdWriteData('+');tp=temp;temp=tp*0.0625*10+0.5; mm=temp;datas0 = temp / 1000; datas1 = temp % 1000 / 100; datas2 = temp % 100 / 10; datas3 = temp% 10;if(th < 0)LcdWriteCom(0x89);LcdWriteData('-'); tt=-th; else LcdWriteCom(0x89);LcdWriteData('+');tt=th;datas10

4、= tt / 100; datas11 = tt% 100 / 10; datas12 = tt % 10; LcdWriteCom(0x87); LcdWriteData('H'); LcdWriteCom(0x88); LcdWriteData(':'); LcdWriteCom(0x8a); LcdWriteData('0'+datas10); LcdWriteCom(0x8b);LcdWriteData('0'+datas11); LcdWriteCom(0x8c);LcdWriteData('0'+dat

5、as12);if(tl < 0)LcdWriteCom(0x90); LcdWriteData('-');rr=-tl; else LcdWriteCom(0x90);LcdWriteData('+');rr=tl;datas20 = rr / 100; datas21 = rr% 100 / 10; datas22 = rr % 10; LcdWriteCom(0x8e); LcdWriteData('L'); LcdWriteCom(0x8f); LcdWriteData(':'); LcdWriteCom(0x91);

6、 LcdWriteData('0'+datas20); LcdWriteCom(0x92);LcdWriteData('0'+datas21);LcdWriteCom(0x93);LcdWriteData('0'+datas22);if(mm>=(th*10)|mm<=(tl*10)|th<=tl) beep=0;elsebeep=1;LcdWriteCom(0x80);LcdWriteData('T');LcdWriteCom(0x81);LcdWriteData('A');LcdWriteCo

7、m(0x82);LcdWriteData('I');LcdWriteData(' ');LcdWriteCom(0x84);LcdWriteData('A');LcdWriteCom(0x85);LcdWriteData('N');LcdWriteCom(0xc1);LcdWriteData('0'+datas0);LcdWriteCom(0xc2);LcdWriteData('0'+datas1);LcdWriteCom(0xc3); LcdWriteData('0'+datas2

8、);LcdWriteCom(0xc4); LcdWriteData('.');LcdWriteCom(0xc5); LcdWriteData('0'+datas3);LcdWriteCom(0xc6); LcdWriteData('"');#ifndef _LCD_H_#define _LCD_H_ /* 当使用的是 4 位数据传输的时候定义， 使用 8 位取消这个定义*/ #define LCD1602_4PINS/*包含头文件#include<reg51.h>/- 重定义关键词 -/#ifndef uchar#defin

9、e uchar unsigned char#endif#ifndef uint#define uint unsigned int#endif/*PIN 口定义*/ #define LCD1602_DATAPINS P0 sbit LCD1602_E=P27;sbit LCD1602_RW=P25;sbit LCD1602_RS=P26;/*函数声明 /*在 51 单片机 12MHZ 时钟下的延时函数 */ void Lcd1602_Delay1ms(uint c); / 误差 0us /*LCD1602 写入 8 位命令子函数 */ void LcdWriteCom(uchar com);/*

10、LCD1602 写入 8 位数据子函数 */ void LcdWriteData(uchar dat) ;/*LCD1602 初始化子程序 */void LcdInit();#endif#ifndef _TEMP_H_#define _TEMP_H_#include<reg51.h>sbit DSPORT=P37;void Delay1ms(unsigned int ); unsigned char Ds18b20Init();void Ds18b20WriteByte(unsigned char com); unsigned char Ds18b20ReadByte();void

11、 Ds18b20ChangTemp();void Ds18b20ReadTempCom();int Ds18b20ReadTemp();#endif#include"lcd.h"void Lcd1602_Delay1ms(uint c)/ 延时uchar a,b;for (; c>0; c-)for (b=19;b>0;b-)for(a=1;a>0;a-);#ifndef LCD1602_4PINS /LCD1602_4PINS 时void LcdWriteCom(uchar com)当没有定义这个/写入一个字节命令LCD1602_E = 0;LCD160

12、2_RS = 0;LCD1602_RW = 0;LCD1602_DATAPINS = com;Lcd1602_Delay1ms(1);LCD1602_E = 1;Lcd1602_Delay1ms(5);LCD1602_E = 0;#elsevoid LcdWriteCom(uchar com)LCD1602_E = 0;LCD1602_RS = 0;LCD1602_RW = 0;P0LCD1602_DATAPINS = com; /由于 4 位的接线是接到 口的高四位，所以传送高四位不用改Lcd1602_Delay1ms(1);LCD1602_E = 1;Lcd1602_Delay1ms(5)

13、;LCD1602_E = 0;LCD1602_DATAPINS = com << 4; / 发送低四位Lcd1602_Delay1ms(1);LCD1602_E = 1;Lcd1602_Delay1ms(5);LCD1602_E = 0;#endif#ifndef LCD1602_4PINSvoid LcdWriteData(uchar dat) /写入一个字节数据 LCD1602_E = 0;LCD1602_RS = 1;LCD1602_RW = 0;LCD1602_DATAPINS = dat;Lcd1602_Delay1ms(1);LCD1602_E = 1;Lcd1602_

14、Delay1ms(5);LCD1602_E = 0;#elsevoid LcdWriteData(uchar dat)LCD1602_E = 0;LCD1602_RS = 1;LCD1602_RW = 0;P0LCD1602_DATAPINS = dat;/由于 4 位的接线是接到口的高四位，所以传送高四位不用改Lcd1602_Delay1ms(1);LCD1602_E = 1;/写入时序Lcd1602_Delay1ms(5);LCD1602_E = 0;LCD1602_DATAPINS = dat << 4; / 写入低四位Lcd1602_Delay1ms(1);LCD1602_

15、E = 1;/写入时序Lcd1602_Delay1ms(5);LCD1602_E = 0;#endif#ifndef LCD1602_4PINSvoid LcdInit() /LCD 初始化子程序 LcdWriteCom(0x38);LcdWriteCom(0x0c);LcdWriteCom(0x06);LcdWriteCom(0x01);LcdWriteCom(0x80);#elsevoid LcdInit()LcdWriteCom(0x32);LcdWriteCom(0x28);LcdWriteCom(0x0c);LcdWriteCom(0x06);LcdWriteCom(0x01);Lc

16、dWriteCom(0x80);#endif#include"temp.h"void Delay1ms(unsigned int y) / 延时 unsigned int x;for(y;y>0;y-)for(x=110;x>0;x-);unsigned char Ds18b20Init() / 初始化 unsigned int i;DSPORT=0;i=70;while(i-);DSPORT=1;i=0;while(DSPORT) i+;if(i>5000)return 0;/ 失败return 1;/ 成功void Ds18b20WriteByte(u

17、nsigned char dat) / 写字节 unsigned int i,j;for(j=0;j<8;j+)DSPORT=0; / 每写入一位数据之前先把总线拉 低 1us (数据手册上模糊)i+;DSPORT=dat&0x01;i=6;while(i-);DSPORT=1;dat>>=1;unsigned char Ds18b20ReadByte() unsigned char byte,bi;unsigned int i,j;for(j=8;j>0;j-)DSPORT=0;i+;DSPORT=1;i+;i+;bi=DSPORT;byte=(byte>>1)|(bi<<7);i=4;while(i-);return byte;void Ds18b20ChangTemp() / 温度转换Ds18b20Init();Delay1ms(1);Ds18b20WriteByte(0xcc);Ds18b20WriteByte(0x44);/读取温度命令void Ds18b20Re