利用DS18B20测温，并通过LCD1602 显示 proteus仿真 +DS1302时钟模块

main.c 

#include
#include
#include
#include

#define uchar unsigned char
#define uint unsigned int


uchar code Write_addr [] ={0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};//写地址
uchar code Read_addr [] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};//读地址
uchar Time [7] = {0x50,0x59,0x23,0x07,0x06,0x02,0x22};//初始值设置
//                 秒   分   时    日   月   星期  年

//-----------------------------------变量区---------------------------------
uint Temp;//温度变量

//-----------------------------------函数区---------------------------------

void Int_DS1302()
{
	uchar i;
	Write_Ds1302_Byte( 0x8e,0x00 );
	for(i = 0;i < 8;i++)
	{
		Write_Ds1302_Byte( Write_addr [i],Time [i] );
	}
	Write_Ds1302_Byte( 0x8e,0x80 );
}

void Read_DS1302_Time()
{
	uchar i;
	for(i = 0;i<8;i++)
	{
		Time [i] = Read_Ds1302_Byte( Read_addr [i] );
	}
}

void Display_Time()
{
	LCD_ShowNum(2,15,Time [0]%16,1);
	LCD_ShowNum(2,14,Time [0]/16,1);
		
	LCD_ShowChar(2 ,13,':');
		
	LCD_ShowNum(2,12,Time [1]%16,1);
	LCD_ShowNum(2,11,Time [1]/16,1);
		
	LCD_ShowChar(2 ,10,':');
		
	LCD_ShowNum(2,9,Time [2]%16,1);
	LCD_ShowNum(2,8,Time [2]/16,1);
	
	LCD_ShowChar(2 ,7,'-');
	
	LCD_ShowNum(2,6,Time [3]%16,1);
	LCD_ShowNum(2,5,Time [3]/16,1);
	
	LCD_ShowChar(2 ,4,'-');
	
	LCD_ShowNum(2,3,Time [4]%16,1);
	LCD_ShowNum(2,2,Time [4]/16,1);
}

void main()
{
	Int_DS1302();
	LCD_initial();
	
	while(1)
	{
		Read_DS1302_Time();
		Temp = Read_Temp();
		
		string(0x82,"Temp");
		LCD_ShowChar(1 ,7,':');
		LCD_ShowChar(1 ,11,'C');
		LCD_ShowNum(1,8,Temp,3);//第一行直接显示温度占四个单元格
		
//---------------------------------显示时间----------------------------------------
		Display_Time();
	}
}

onewire.c

#include "reg52.h"
#include

#define uchar unsigned char
#define uint unsigned int

sbit DQ = P3^3;  //单总线接口

//单总线延时函数
void Delay_OneWire(unsigned int t)  //STC89C52RC
{
	while(t--);
}

//通过单总线向DS18B20写一个字节
void Write_DS18B20(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		DQ = 0;
		DQ = dat&0x01;
		Delay_OneWire(12);
		DQ = 1;
		dat >>= 1;
	}
	Delay_OneWire(5);
}

//从DS18B20读取一个字节
unsigned char Read_DS18B20(void)
{
	unsigned char i;
	unsigned char dat;
  
	for(i=0;i<8;i++)
	{
		DQ = 0;
		dat >>= 1;
		DQ = 1;
		if(DQ)
		{
			dat |= 0x80;
		}	    
		Delay_OneWire(5);
	}
	return dat;
}

//DS18B20设备初始化
bit init_ds18b20(void)
{
  	bit initflag = 0;
  	
  	DQ = 1;
  	Delay_OneWire(12);
  	DQ = 0;
  	Delay_OneWire(80);
  	DQ = 1;
  	Delay_OneWire(10); 
    initflag = DQ;     
  	Delay_OneWire(5);
  
  	return initflag;
}


uint Read_Temp()
{
	uint high,low,Date_T;
	
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	Delay_OneWire(225); 
	
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	
	low = Read_DS18B20();
	high = Read_DS18B20();
	
	Date_T = high<<8;
	Date_T = Date_T+low;
	Date_T = Date_T * 0.0625+0.5;//
	
	return Date_T;
}

onewire.h

#ifndef __ONEWIRE_H
#define __ONEWIRE_H

#define uchar unsigned char
#define uint unsigned int

unsigned char rd_temperature(void);  //; ;
unsigned char Read_DS18B20(void);
void Write_DS18B20(unsigned char dat);
bit init_ds18b20(void);
uchar Read_Temp(void);
#endif

LCD.c

#include
#include 

#define uchar unsigned char
#define uint unsigned int
#define  out P2 	
sbit rs = P1^5;
sbit rw = P1^4;
sbit e =  P1^3;

void delay(uint j)
{
uchar i=250;
for(;j>0;j--)
	{
	while(--i);
	i=249;
	while(--i);
	i=250;
	}
}

void check_busy(void)
{
uchar dt;
do
{
dt=0xff;
e=0;
rs=0;	
rw=1;
e=1;
dt=out;
}while(dt&0x80);
e=0;
}

void write_command(uchar com)//写命令
{
check_busy();
e=0;
rs=0;
rw=0;
out=com;
e=1;
_nop_();
e=0;
delay(1);
}
void write_data(uchar dat)//写数据 
{
check_busy();
e=0;
rs=1;
rw=0;
out=dat;
e=1;
_nop_();
e=0;
delay(1);	
}
void LCD_initial(void)//初始化
{
	delay(2);
	write_command(0x38);
	delay(1);
	write_command(0x38);
	write_command(0x08);
	write_command(0x01);
	write_command(0x06);
	write_command(0x0c);
	//delay(1);
}
void string(uchar ad,uchar *s)//显示字符
 {
write_command(ad);
while(*s>0)
	{
	write_data(*s++);
	delay(100);
	}
}

int LCD_Pow(uint x,uint y)//
{
	unsigned char i = 0;
	int result = 1;
	
	for(i=0;i0;i--)
	{
		write_data('0'+Num/LCD_Pow(10,i-1)%10);
	}
}

void LCD_ShowChar(unsigned char Line , unsigned char Columu , unsigned char Char)//写一个字符
{
	LCD_SetCursor(Line,Columu);

	write_data(Char);
}

LCD.h

#ifndef __LCD_H__
#define __LCD_H__

#define uchar unsigned char
#define uint unsigned int

void check_busy(void);
void write_command(unsigned char com);
void write_data(uchar dat);
void LCD_initial(void);
void string(uchar ad ,uchar *s);
void lcd_test(void);
void delay(uint);
void LCD_ShowNum(uchar Line,uchar Columu,uint Num,uint Length);//显示数字
void LCD_SetCursor(uchar Line,uchar Columu);
int LCD_Pow(uchar x,uchar y);
void LCD_ShowChar(unsigned char Line , unsigned char Columu , unsigned char Char);//写一个字符
#endif

ds1302.c

#include 
#include 

sbit SCK = P3^1;		
sbit SDA = P3^2;		
sbit RST = P3^0;   // DS1302复位												

#define uchar unsigned char
#define uint unsigned int
	
//uchar code Write_addr [] ={0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};//写地址
//uchar code Read_addr [] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};//读地址
//uchar Time [7] = {0x50,0x59,0x23,0x00,0x00,0x00,0x00};//初始值设置
                 秒   分   时    日   月   星期  年

void Write_Ds1302(unsigned  char temp) 
{
	unsigned char i;
	for (i=0;i<8;i++)     	
	{ 
		SCK=0;
		SDA=temp&0x01;
		temp>>=1; 
		SCK=1;
	}
}   

void Write_Ds1302_Byte( unsigned char address,unsigned char dat )     
{
 	RST=0;	_nop_();
 	SCK=0;	_nop_();
 	RST=1; 	_nop_();  
 	Write_Ds1302(address);	
 	Write_Ds1302(dat);		
 	RST=0; 
}

unsigned char Read_Ds1302_Byte ( unsigned char address )
{
 	unsigned char i,temp=0x00;
 	RST=0;	_nop_();
 	SCK=0;	_nop_();
 	RST=1;	_nop_();
 	Write_Ds1302(address);
 	for (i=0;i<8;i++) 	
 	{		
		SCK=0;
		temp>>=1;	
 		if(SDA)
 		temp|=0x80;	
 		SCK=1;
	} 
 	RST=0;	_nop_();
 	SCK=0;	_nop_();
	SCK=1;	_nop_();
	SDA=0;	_nop_();
	SDA=1;	_nop_();
	return (temp);			
}

ds1302.h

#ifndef __DS1302_H
#define __DS1302_H

void Write_Ds1302(unsigned char temp);
void Write_Ds1302_Byte( unsigned char address,unsigned char dat );
unsigned char Read_Ds1302_Byte( unsigned char address );

#endif

仿真图