基于51单片机轮胎胎压监测系统—数码管显示-编程知识

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 signalsbit SDA = P2 ^ 1;	                        //Êý¾ÝÏß
sbit SCL = P2 ^ 0;	                        //Ê±ÖÓÏß
bit bAck;	                                  //Ó¦´ð±êÖ¾ µ±bbAck=1ÊÇÎªÕýÈ·µÄÓ¦´ðunsigned 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´µÄÖµvoid 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¡ÊýµãP0&=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¶ËADDI=channel&0x1;_nop_();_nop_();ADCLK=0;//ÀµÍCLK¶Ë,ÐÎ³ÉÏÂ½µÑØ2_nop_();_nop_();ADCLK=1;//À¸ßCLK¶ËADDI=(channel>>1)&0x1;_nop_();_nop_();ADCLK=0;//ÀµÍCLK¶Ë,ÐÎ³ÉÏÂ½µÑØ3ADDI=1;//¿ØÖÆÃüÁî½áÊø _nop_();_nop_();dat=0;for(i=0;i<8;i++){dat|=ADDO;//ÊÕÊý¾ÝADCLK=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;//ÊÕÊý¾ÝADCLK=1;_nop_();_nop_();ADCLK=0;//ÐÎ³ÉÒ»´ÎÊ±ÖÓÂö³å_nop_();_nop_();j=j<<7;ndat=ndat|j;if(i<7)ndat>>=1;}ADCS=1;//ÀµÍCS¶ËADCLK=0;//ÀµÍCLK¶ËADDO=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±ÖÓÐÅºÅSCL = 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¦´ðÐÅºÅSCL = 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;	                            //×óÒÆ²¹Áãif (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¶¯×ÜÏßSendByte(WChipAdd);							//·¢ËÍÆ÷¼þµØÖ·ÒÔ¼°ÃüÁîif (bAck==1)											  //ÊÕµ½Ó¦´ð{SendByte(InterAdd);								//·¢ËÍÄÚ²¿×ÓµØÖ·if (bAck ==1){SendByte(WIICData);							//·¢ËÍÊý¾Ýif(bAck == 1){StopI2C();                    //Í£Ö¹×ÜÏßreturn(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°¶ÁÃüÁîif (bAck==1)								    	//ÊÕµ½Ó¦´ð{SendByte(InterDataAdd);					//·¢ËÍÄÚ²¿×ÓµØÖ·if (bAck ==1){StartI2C();SendByte(RChipAdd);	if(bAck == 1){TempData = RevByte();       //½ÓÊÕÊý¾ÝStopI2C();                  //Í£Ö¹I2C×ÜÏßreturn(TempData);           //·µ»ØÊý¾Ý}else{return(0x03);}	}else{return(0x02);}}else{return(0x01);}
}