Use DS18B20 to measure temperature and display it through LCD1602 Proteus simulation + DS1302 clock module

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}; // write address

uchar code Read_addr[] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d}; // read address

uchar Time [7] = {0x50, 0x59, 0x23, 0x07, 0x06, 0x02, 0x22}; // Initial value setting

// Seconds Minutes Hours Day Month Week Year

//-----------------------------------Variable area---------------------------------

uint Temp; // temperature variable

//-----------------------------------Function area---------------------------------

void Int_DS1302()

{

flying 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()

{

flying 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); //The first row directly displays the temperature, occupying four cells

//---------------------------------display time----------------------------------------

Display_Time();

}

}

onewire.c

#include "reg52.h"

#include

#define uchar unsigned char

#define uint unsigned int

sbit DQ = P3^3; //single bus interface

// Single bus delay function

void Delay_OneWire(unsigned int t)  //STC89C52RC

{

while(t--);

}

//Write a byte to DS18B20 via single bus

void Write_DS18B20(unsigned char dat)

{

unsigned char i;

for(i=0;i<8;i++)

{

DQ = 0;

DQ = that&0x01;

Delay_OneWire(12);

DQ = 1;

that >>= 1;

}

Delay_OneWire(5);

}

//Read a byte from DS18B20

unsigned char Read_DS18B20(void)

{

unsigned char i;

unsigned char dat;

for(i=0;i<8;i++)

{

DQ = 0;

that >>= 1;

DQ = 1;

if(DQ)

{

that |= 0x80;

}     

Delay_OneWire(5);

}

return that;

}

//DS18B20 device initialization

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)

{

fly i=250;

for(;j>0;j--)

{

while(--i);

i=249;

while(--i);

i=250;

}

}

void check_busy(void)

{

flying dt;

do

{

dt=0xff;

e=0;

rs=0;

rw=1;

e=1;

dt=out;

}while(dt&0x80);

e=0;

}

void write_command(uchar com) //write command

{

check_busy();

e=0;

rs=0;

rw=0;

out=com;

e=1;

_nop_();

e=0;

delay(1);

}

void write_data(uchar dat)//write data 

{

check_busy();

e=0;

rs=1;

rw=0;

out=that;

e=1;

_nop_();

e=0;

delay(1);

}

void LCD_initial(void) //initialization

{

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) //display characters

 {

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;i {

result *= x;

}

return result;

}

void LCD_SetCursor(uchar Line,uchar Columu) //Line selection

{

if(Line == 1)

{

write_command(0x80|(Columu-1));

}

else

{

write_command(0x80|( Columu-1)+0x40);

}

}

// row grid number length

void LCD_ShowNum(uchar Line,uchar Columu,uint Num,uint Length)//Display number

{

uint i = 0;

LCD_SetCursor(Line,Columu);

for(i=Length;i>0;i--)

{

write_data('0'+Num/LCD_Pow(10,i-1)%10);

}

}

void LCD_ShowChar(unsigned char Line, unsigned char Columu, unsigned char Char) //Write a character

{

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(flyer name ,flyer *s);

void lcd_test(void);

void delay(uint);

void LCD_ShowNum(uchar Line,uchar Columu,uint Num,uint Length);//Display number

void LCD_SetCursor(float Line, float Column);

int LCD_Pow(volatile x,volatile y);

void LCD_ShowChar(unsigned char Line, unsigned char Columu, unsigned char Char); //Write a character

#endif

ds1302.c

#include

#include

sbit SCK = P3^1;

sbit SDA = P3^2;

sbit RST = P3^0; // DS1302 reset

#define uchar unsigned char

#define uint unsigned int

//uchar code Write_addr [] = {0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c}; //write address

//uchar code Read_addr[] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d}; //read address

//uchar Time [7] = {0x50, 0x59, 0x23, 0x00, 0x00, 0x00, 0x00}; //initial value setting

                 Seconds Minutes Hours Day Month Week Year

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(that);

  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

Simulation diagram