单片机测温系统（AT89C51、DS18B20温度传感器、LCD1602）

单片机测温系统

想要更多项目私wo!!!

一、简介

此系统主要由AT89C51、DS18B20温度模块和LCD1602组成。
大致的原理是DS18B20温度采集到的数据传送给AT89C51的P3.3/INT1（外部中断1），最后通过LCD1602显示当前的实时温度。

二、效果图

模拟仿真图

三、源代码

/*想要更多项目私wo!!!*/
/*************** writer:shopping.w ******************/
#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define delayNOP() {
      _nop_();_nop_();_nop_();_nop_();}sbit DQ = P3^3;
sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_EN = P2^2;uchar code Temp_Disp_Title[]={
    "Current Temp : "};
uchar Current_Temp_Display_Buffer[]={
    " TEMP: "};uchar code Temperature_Char[8] = 
{
    0x0c,0x12,0x12,0x0c,0x00,0x00,0x00,0x00
};uchar code df_Table[]=
{
    0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9
};uchar CurrentT = 0;
uchar Temp_Value[]={
    0x00,0x00};
uchar Display_Digit[]={
    0,0,0,0};
bit DS18B20_IS_OK = 1;void DelayXus(uint x)
{
    uchar i;while(x--){
    for(i=0;i<200;i++);}
}bit LCD_Busy_Check()
{
    bit result;LCD_RS = 0;LCD_RW = 1;LCD_EN = 1;delayNOP();result = (bit)(P0&0x80);LCD_EN=0;return result;
}void Write_LCD_Command(uchar cmd)
{
    while(LCD_Busy_Check());LCD_RS = 0;LCD_RW = 0;LCD_EN = 0;_nop_();_nop_();P0 = cmd;delayNOP();LCD_EN = 1;delayNOP();LCD_EN = 0;
}void Write_LCD_Data(uchar dat)
{
    while(LCD_Busy_Check());LCD_RS = 1;LCD_RW = 0;LCD_EN = 0;P0 = dat;delayNOP();LCD_EN = 1;delayNOP();LCD_EN = 0;
}void LCD_Initialise()
{
    Write_LCD_Command(0x01);DelayXus(5);Write_LCD_Command(0x38);DelayXus(5);Write_LCD_Command(0x0c);DelayXus(5);Write_LCD_Command(0x06);DelayXus(5);	
}void Set_LCD_POS(uchar pos)
{
    Write_LCD_Command(pos|0x80);	
}void Delay(uint x)
{
    while(--x);
}uchar Init_DS18B20()
{
    uchar status;DQ = 1;Delay(8);DQ = 0;Delay(90);DQ = 1;Delay(8);DQ = 1;return status;
}uchar ReadOneByte()
{
    uchar i,dat=0;DQ = 1;_nop_();for(i=0;i<8;i++){
    DQ = 0;dat >>= 1;DQ = 1;_nop_();_nop_();if(DQ)dat |= 0X80;Delay(30);DQ = 1;}return dat;
}void WriteOneByte(uchar dat)
{
    uchar i;for(i=0;i<8;i++){
    DQ = 0;DQ = dat& 0x01;Delay(5);DQ = 1;dat >>= 1;}
}void Read_Temperature()
{
    if(Init_DS18B20()==1)DS18B20_IS_OK=0;else{
    WriteOneByte(0xcc);WriteOneByte(0x44);Init_DS18B20();WriteOneByte(0xcc);WriteOneByte(0xbe);Temp_Value[0] = ReadOneByte(); Temp_Value[1] = ReadOneByte();DS18B20_IS_OK=1;	}	
}void Display_Temperature()
{
    uchar i;uchar t = 150, ng = 0;if((Temp_Value[1]&0xf8)==0xf8){
    Temp_Value[1] = ~Temp_Value[1];Temp_Value[0] = ~Temp_Value[0]+1;if(Temp_Value[0]==0x00)Temp_Value[1]++;ng = 1;	}Display_Digit[0] = df_Table[Temp_Value[0]&0x0f];CurrentT = ((Temp_Value[0]&0xf0)>>4) | ((Temp_Value[1]&0x07)<<4);Display_Digit[3] = CurrentT/100;Display_Digit[2] = CurrentT%100/10;Display_Digit[1] = CurrentT%10;Current_Temp_Display_Buffer[11] = Display_Digit[0] + '0';Current_Temp_Display_Buffer[10] = '.';Current_Temp_Display_Buffer[9]  = Display_Digit[1] + '0';Current_Temp_Display_Buffer[8]  = Display_Digit[2] + '0';Current_Temp_Display_Buffer[7]  = Display_Digit[3] + '0';if(Display_Digit[3] == 0)Current_Temp_Display_Buffer[7]  = ' ';if(Display_Digit[2] == 0&&Display_Digit[3]==0)Current_Temp_Display_Buffer[8]  = ' ';if(ng){
    if(Current_Temp_Display_Buffer[8]  == ' ')Current_Temp_Display_Buffer[8]  = '-';else if(Current_Temp_Display_Buffer[7]  == ' ')Current_Temp_Display_Buffer[7]  = '-';else Current_Temp_Display_Buffer[6]  = '-';}Set_LCD_POS(0x00);for(i=0;i<16;i++){
    Write_LCD_Data(Temp_Disp_Title[i]); 	}Set_LCD_POS(0x40);for(i=0;i<16;i++){
    Write_LCD_Data(Current_Temp_Display_Buffer[i]); 	}		Set_LCD_POS(0x4d);Write_LCD_Data(0x00);Set_LCD_POS(0x4e);Write_LCD_Data('C');
}void main()
{
    LCD_Initialise();Read_Temperature();Delay(50000);Delay(50000);while(1){
    Read_Temperature();if(DS18B20_IS_OK) Display_Temperature();DelayXus(100);		}}