程序资料齐全的51单片机的液晶显示超声波测距仪 -

#ifndef _1602_H_
#define _1602_H_
#include "reg52.h"
sbit RS=P1^0;
sbit RW=P1^1;
sbit EN=P1^2;
void delay();
void delay1(int z);
void write_com(unsigned char com);
void write_date(unsigned char date);
void L1602_init();
void L1602_char(unsigned char hang,unsigned char lie,char sign);
void L1602_string(unsigned char hang,unsigned char lie,unsigned char *p);
void L1602_int(unsigned char hang, unsigned char lie, int num);
#endif
#include "1602.H"
#include "reg52.h"
#define uint unsigned int
#define uchar unsigned char
void delay()
{
int i,j;
for(i=1;i>0;i--)
for(j=15;j>0;j--);
}
void delay1(int z)
{
int i,j;
for(i=z;i>0;i--)
for(j=110;j>0;j--);
}
void write_com(uchar com)
{
P0 = com;
RS = 0;
RW = 0;//写
EN = 0;
delay();
EN = 1;
delay();
}
void write_date(uchar date)
{
P0 = date;
RS = 1;
RW = 0;
EN = 0;
delay();
EN = 1;
delay();
}
void L1602_init()
{
write_com(0x01); //清屏
write_com(0x38); //显示模式
write_com(0x0c); //显示和光标
write_com(0x06); //地址指针设置
}
void L1602_char(uchar hang,uchar lie,char sign)//显示单个字符
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0x80+0x40;
a = a + lie - 1;
write_com(a);//写地址
write_date(sign); //写数据
}
void L1602_string(uchar hang,uchar lie,uchar *p) //显示字符串
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0x80+0x40;
a = a + lie - 1;
write_com(a);
while(1)
{
if(*p == '\0') break;
write_date(*p);
p++;
}
}
void L1602_int(uchar hang, uchar lie, int num)
{
uint temp;
uint gewei,shiwei,baiwei,xiaoshu;
temp = num;
baiwei = temp / 1000;
shiwei = temp % 1000 / 100;
gewei = temp % 100 / 10;
xiaoshu = temp % 10;
if (num>=1000)
{
L1602_char(hang, lie+1, baiwei+48);
L1602_char(hang, lie+2, shiwei+48);
L1602_char(hang, lie+3, gewei+48);
L1602_char(hang, lie+4, '.');
L1602_char(hang, lie+5, xiaoshu+48);
}
else if (num>=100)
{
L1602_char(hang, lie+1, ' ');
L1602_char(hang, lie+2, shiwei+48);
L1602_char(hang, lie+3, gewei+48);
L1602_char(hang, lie+4, '.');
L1602_char(hang, lie+5, xiaoshu+48);
}
else
{
L1602_char(hang, lie+1, ' ');
L1602_char(hang, lie+2, ' ');
L1602_char(hang, lie+3, gewei+48);
L1602_char(hang, lie+4, '.');
L1602_char(hang, lie+5, xiaoshu+48);
}
}

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#include"1602.h"
#define uchar unsigned char
#define uint unsigned int
sbit tring = P1^3; //超声波控制端
sbit echo = P3^2; //回波必须接在外部中断引脚上
sbit ledwarn = P2^0; //报警灯，低电平亮
sbit beep = P2^1; //报警蜂鸣器
uint displayCount;//显示计数
uint time = 0;//时间
unsigned long distance ;//距离
float distancef;//浮点型的数据
uint flagSucceed = 0; //测量成功标志位
uint flagDisplay = 0; //开显示标志位
void delay_20us()
{
uchar i ;
for(i=0;i<140;i++);
}
void init_shuju()
{
tring = 0;
distance = 0;
displayCount = 0;
}
void init_waibu0()
{
IT0 = 0; //外部引脚为低时触发中断
EX0=0; //关闭外部中断
}
void timer0_Init()
{
TMOD = 0x11; //定时器0和1工作在16位方式
TH0 = (65535-45872)/256;
TL0 = (65535-45872)%6;
TR0 = 1; //启动定时器
ET0 = 1; //允许定时器0中断
}
void timer1_Init()
{
TMOD = 0x11; //定时器0和1工作在16位方式
TH1 = 0;
TL1 = 0;
ET1 = 1; //定时器1中断允许
}
void wbzd0() interrupt 0//下降沿触发
{
time =TH1*256+TL1; //取出定时器的值
flagSucceed = 1; //置成功测量的标志
EX0=0; //关闭外部中断
// TR1=0;
}
void timer0() interrupt 1 // 定时器0
{
TH0 = (65535-45872)/256;
TL0 = (65535-45872)%6;
displayCount ++;
if (displayCount >= 20) //1秒钟显示一次
{
flagDisplay = 1; //开显示
displayCount = 0;
}
}
void start_csb() //启动csb模块
{
tring = 1;
delay_20us();
tring = 0;
}
void main()
{
EA=0;
init_shuju();
init_waibu0();
timer0_Init();
timer1_Init();
L1602_init();
L1602_string(1,1,"welcome my ");
L1602_string(2,1,"test distance ");
delay1(1);
while(1)
{
EA=0;//关闭总中断
start_csb();
while(echo==0);//变高则进入下一步
flagSucceed = 0;
TR1=1; //启动定时器1开始计数
EA = 1;
EX0=1;
TH1= 0;
TL1= 0;
TF1= 0; //定时器1溢出标志位
while (TH1<90) ; //盲区
TR1 = 0; //关闭定时器1
EX0 = 0; //关闭外部中断
if(flagSucceed==1) //一次测试成功，则计算距离，单位为厘米
{
distancef = time * 1.085;//微妙为单位
distancef /=58;//单位为厘米
distance = distancef*10+0.5;
//如果距离小于20cm，则声光报警
if ((flagSucceed == 1) && (distance <= 200))
{
ledwarn = 0;
beep = 0;
delay1(1);
beep = 1;
delay1(1);
}
else
{
ledwarn = 1;
beep = 1;
}
}
if (flagDisplay == 1) //1秒显示时间到
{
if(flagSucceed==0)//没有测试成功
{
L1602_string(1,1," can't distance ");
L1602_string(2,1," ------ ");
}
else
{
//LCD显示数据
L1602_string(1,1,"distance result:");
L1602_string(2,1," cm ");
L1602_int(2,5,distance);
}
flagDisplay = 0;
}
}
}

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