基于51单片机轮胎胎压监测系统

基于51单片机轮胎胎压监测系统—数码管显示

news2024/11/25 17:23:13

基于51单片机轮胎胎压监测系统

（仿真＋程序＋设计报告）

功能介绍

具体功能：

1.MPX4115压力传感器胎压检测；

2.ADC0832进行模数转换后，51单片机处理控制；

3.数码管显示胎压；

4.胎压过高蜂鸣器报警；

演示视频：

基于51单片机气压监测系统—数码管显示

//ÏßÐÔÇø¼ä±ê¶È±ä»»¹«Ê½£º    y=(115-15)/(243-13)*X+15kpa   
#include <AT89X52.h> 
#include <intrins.h>
#include <stdio.h>

#define R24C04ADD 0xA1
#define W24C04ADD 0xA0

//ADC0832µÄÒý½Å
sbit ADCS =P2^2;  //ADC0832 chip seclect
sbit ADDI =P2^4;  //ADC0832 k in
sbit ADDO =P2^4;  //ADC0832 k out
sbit ADCLK =P2^3;  //ADC0832 clock signal

sbit SDA = P2 ^ 1;	                        //Êý¾ÝÏß
sbit SCL = P2 ^ 0;	                        //Ê±ÖÓÏß
bit bAck;	                                  //Ó¦´ð±êÖ¾ µ±bbAck=1ÊÇÎªÕýÈ·µÄÓ¦´ð

unsigned char dispbitcode[8]={0xf7,0xfb,0xfd,0xfe,0xef,0xdf,0xbf,0x7f};  //Î»É¨Ãè
unsigned char dispcode[11]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xff};  //¹²ÑôÊýÂë¹Ü×Ö¶ÎÂë
unsigned char dispbuf[4];
unsigned int temp;
unsigned char getdata; //»ñÈ¡ADC×ª»»»ØÀ´µÄÖµ

void delay_1ms(void)  //12mhz delay 1.01ms
{
   unsigned char x,y;   
   x=3;
   while(x--) 
  {
       y=40;
       while(y--);
    }
}
void display(void)  //ÊýÂë¹ÜÏÔÊ¾º¯Êý
{
  char k;
  for(k=0;k<4;k++)
  {

  P1 = dispbitcode[k];
  P0 = dispcode[dispbuf[k]];
  if(k==1)	  //¼ÓÉÏÊýÂë¹ÜµÄdpÐ¡Êýµã
  	P0&=0x7f;
  delay_1ms();	  
  }
}

/************
¶ÁADC0832º¯Êý
************/

//²É¼¯²¢·µ»Ø
unsigned int Adc0832(unsigned char channel)     //AD×ª»»£¬·µ»Ø½á¹û
{
    unsigned char i=0;
    unsigned char j;
    unsigned int dat=0;
    unsigned char ndat=0;

    if(channel==0)channel=2;
    if(channel==1)channel=3;
    ADDI=1;
    _nop_();
    _nop_();
    ADCS=0;//ÀµÍCS¶Ë
    _nop_();
    _nop_();
    ADCLK=1;//À¸ßCLK¶Ë
    _nop_();
    _nop_();
    ADCLK=0;//ÀµÍCLK¶Ë,ÐÎ³ÉÏÂ½µÑØ1
    _nop_();
    _nop_();
    ADCLK=1;//À¸ßCLK¶Ë
    ADDI=channel&0x1;
    _nop_();
    _nop_();
    ADCLK=0;//ÀµÍCLK¶Ë,ÐÎ³ÉÏÂ½µÑØ2
    _nop_();
    _nop_();
    ADCLK=1;//À¸ßCLK¶Ë
    ADDI=(channel>>1)&0x1;
    _nop_();
    _nop_();
    ADCLK=0;//ÀµÍCLK¶Ë,ÐÎ³ÉÏÂ½µÑØ3
    ADDI=1;//¿ØÖÆÃüÁî½áÊø 
    _nop_();
    _nop_();
    dat=0;
    for(i=0;i<8;i++)
    {
        dat|=ADDO;//ÊÕÊý¾Ý
        ADCLK=1;
        _nop_();
        _nop_();
        ADCLK=0;//ÐÎ³ÉÒ»´ÎÊ±ÖÓÂö³å
        _nop_();
        _nop_();
        dat<<=1;
        if(i==7)dat|=ADDO;
    }  
    for(i=0;i<8;i++)
    {
        j=0;
        j=j|ADDO;//ÊÕÊý¾Ý
        ADCLK=1;
        _nop_();
        _nop_();
        ADCLK=0;//ÐÎ³ÉÒ»´ÎÊ±ÖÓÂö³å
        _nop_();
        _nop_();
        j=j<<7;
        ndat=ndat|j;
        if(i<7)ndat>>=1;
    }
    ADCS=1;//ÀµÍCS¶Ë
    ADCLK=0;//ÀµÍCLK¶Ë
    ADDO=1;//À¸ßÊý¾Ý¶Ë,»Øµ½³õÊ¼×´Ì¬
    dat<<=8;
    dat|=ndat;
    return(dat);            //return ad k
}

//Æô¶¯I2C×ÜÏß£¬¼´·¢ËÍÆðÊ¼Ìõ¼þ
void StartI2C()
{
	SDA = 1;	                      //·¢ËÍÆðÊ¼Ìõ¼þÊý¾ÝÐÅºÅ
	_nop_();
	SCL = 1;
	_nop_();		                    //ÆðÊ¼½¨Á¢Ê±¼ä´óÓÚ4.7us
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	SDA = 0;	                      //·¢ËÍÆðÊ¼ÐÅºÅ
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	SCL = 0;	                        //Ê±ÖÓ²Ù×÷
	_nop_();
	_nop_();
}
//½áÊøI2C×ÜÏß£¬¼´·¢ËÍI2C½áÊøÌõ¼þ
void StopI2C()
{
	SDA = 0;	                        //·¢ËÍ½áÊøÌõ¼þµÄÊý¾ÝÐÅºÅ
	_nop_();		                      //·¢ËÍ½áÊøÌõ¼þµÄÊ±ÖÓÐÅºÅ
	SCL = 1;	                        //½áÊøÌõ¼þ½¨Á¢Ê±¼ä´óÓÚ4us
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	SDA = 1;	                        //·¢ËÍI2C×ÜÏß½áÊøÃüÁî
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();	
}
//·¢ËÍÒ»¸ö×Ö½ÚµÄÊý¾Ý
void	SendByte(unsigned char c)
{
	unsigned char BitCnt;
	for(BitCnt = 0;BitCnt < 8;BitCnt++)			          //Ò»¸ö×Ö½Ú
		{
			if((c << BitCnt)& 0x80) SDA = 1;	           //ÅÐ¶Ï·¢ËÍÎ»
			else	SDA = 0;
			_nop_();
			SCL = 1;	                      //Ê±ÖÓÏßÎª¸ß£¬Í¨Öª´Ó»ú¿ªÊ¼½ÓÊÕÊý¾Ý
			_nop_();
			_nop_();
			_nop_();
			_nop_();
			_nop_();
			SCL = 0;
		}
	_nop_();
	_nop_();
	SDA = 1;	                                        //ÊÍ·ÅÊý¾ÝÏß£¬×¼±¸½ÓÊÜÓ¦´ðÎ»
	_nop_();
	_nop_();
	SCL = 1;
	_nop_();
	_nop_();
	_nop_();
	if(SDA == 1) bAck =0;
	else bAck = 1;		                                //ÅÐ¶ÏÊÇ·ñÊÕµ½Ó¦´ðÐÅºÅ
	SCL = 0;
	_nop_();
	_nop_();
}
//½ÓÊÕÒ»¸ö×Ö½ÚµÄÊý¾Ý
unsigned char RevByte()
{
	unsigned char retc;
	unsigned char BitCnt;
	retc = 0;
	SDA = 1;
	for(BitCnt=0;BitCnt<8;BitCnt++)
	{
		_nop_();
		SCL = 0;	                                    //ÖÃÊ±ÖÓÏßÎªµÍ£¬×¼±¸½ÓÊÕ
		_nop_();
		_nop_();
		_nop_();
		_nop_();
		_nop_();
		SCL = 1;	                                    //ÖÃÊ±ÖÓÏßÎª¸ßÊ¹µÃÊý¾ÝÓÐÐ§
		_nop_();
		_nop_();
		retc = retc << 1;	                            //×óÒÆ²¹Áã
		if (SDA == 1)
		retc = retc + 1;                             	//µ±Êý¾ÝÎª1ÔòÊÕµ½µÄÊý¾Ý+1
		_nop_();
		_nop_();
	}
	SCL = 0;
	_nop_();
	_nop_();
	return(retc);                                   //·µ»ØÊÕµ½µÄÊý¾Ý
}


unsigned char WIICByte(unsigned char WChipAdd,unsigned char InterAdd,unsigned char WIICData)
{
	StartI2C();										      //Æô¶¯×ÜÏß
	SendByte(WChipAdd);							//·¢ËÍÆ÷¼þµØÖ·ÒÔ¼°ÃüÁî
	if (bAck==1)											  //ÊÕµ½Ó¦´ð
	{
		SendByte(InterAdd);								//·¢ËÍÄÚ²¿×ÓµØÖ·
		if (bAck ==1)
		{
			SendByte(WIICData);							//·¢ËÍÊý¾Ý
			if(bAck == 1)
			{
				StopI2C();                    //Í£Ö¹×ÜÏß
				return(0xff);
			}
			else
			{
				return(0x03);
			}			
		}
		else
		{
			return(0x02);
		}
	}
	return(0x01);
}
//¶ÁÈ¡Ö¸¶¨Æ÷¼þµÄÄÚ²¿Ö¸¶¨µØÖ·Ò»¸ö×Ö½ÚÊý¾Ý
unsigned char RIICByte(unsigned char WChipAdd,unsigned char RChipAdd,unsigned char InterDataAdd)
{
	unsigned char TempData;	
	TempData = 0;
	StartI2C();								        //Æô¶¯
	SendByte(WChipAdd);					    	//·¢ËÍÆ÷¼þµØÖ·ÒÔ¼°¶ÁÃüÁî
	if (bAck==1)								    	//ÊÕµ½Ó¦´ð
	{
		SendByte(InterDataAdd);					//·¢ËÍÄÚ²¿×ÓµØÖ·
		if (bAck ==1)
		{
			StartI2C();
			SendByte(RChipAdd);	
			if(bAck == 1)
			{
				TempData = RevByte();       //½ÓÊÕÊý¾Ý
				StopI2C();                  //Í£Ö¹I2C×ÜÏß
				return(TempData);           //·µ»ØÊý¾Ý
			}
			else
			{
				return(0x03);
			}	
		}
		else
		{
			return(0x02);
		}
	}
	else
	{
		return(0x01);
	}
}