求红外线接收和发射电路，我我要做一个51单片机的水位监测系统。

Question

如题所述

Answer 1

#include <regX52.h>

#define c(x) (x*110592/120000)
sbit Ir_Pin=P3^2;
sbit beep=P2^1;
//sbit RELAY=P2^0;
#define INBUF_LEN 4 //数据长度
unsigned char inbuf1[INBUF_LEN]={'0','0','0','0'};//发送缓冲区
unsigned char inbuf2[50];//接收缓冲区
unsigned char count3;
void init_serialcomm( void )
{
SCON = 0x50 ; //SCON: serail mode 1, 8-bit UART, enable ucvr
T2CON=0x30;
TH2=0x00;
TL2=0x00;
RCAP2H=0xFF;
RCAP2L=0xDC;
TR2=1;
}
//向串口发送一个字符
void send_char_com( unsigned char ch)
{
SBUF=ch;
while (TI== 0 );
TI= 0 ;
}
//向串口发送一个字符串，strlen 为该字符串长度
void send_string_com( unsigned char *str, unsigned int strlen)
{
unsigned int k= 0 ;
do
{
send_char_com(*(str + k));
k++;
} while (k < strlen);
}
//串口接收中断函数
void serial () interrupt 4 using 3
{
if (RI) //RI==开始接收
{
unsigned char ch;
RI = 0 ; //软件RI=0
ch=SBUF;
if (ch> 1 )
{
count3= 0 ;
inbuf2[count3]=ch;
}
else
{
count3++;
inbuf2[count3]=ch;
}
}
}

unsigned char code Led_Tab[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,
0xf8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E}; //共阳极数码显示码0-F.
unsigned char code Led_Sel[]={0x7f,0xbf,0xdf,0xef};
unsigned char dis_8[17]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','-'};

unsigned char Led_Buf[4]; //显示缓冲区
char Led_Index; //位选

unsigned char Ir_Buf[4]; //用于保存解码结果
void delay_50ms(unsigned int t)
{
unsigned int j;
for(;t>0;t--)
for(j=6245;j>0;j--)
{;}
}

//==============================================================
//数码管扫描
timer0() interrupt 1 using 1
{
TL0=65536-1000;
TH0=(65536-1000)/256; //定时器0设定约1000us中断一次，用于数码管扫描
P0=0xff;
P3=Led_Sel[Led_Index]; //位选
P0=Led_Tab[Led_Buf[Led_Index]]; //段选

if(++Led_Index>3) Led_Index=0; //四个扫描完了,到第一个数码管
}
//==============================================================
unsigned int Ir_Get_Low()
{
TL1=0;
TH1=0;
TR1=1;
while(!Ir_Pin && (TH1&0x80)==0);
TR1=0;
return TH1*256+TL1;
}
//=============================================================
unsigned int Ir_Get_High()
{
TL1=0;
TH1=0;
TR1=1;
while(Ir_Pin && (TH1&0x80)==0);
TR1=0;
return TH1*256+TL1;
}
//==============================================================
main()
{
unsigned int temp;
char i,j;
Led_Index=1;
init_serialcomm(); //初始化串口
TMOD=0x11;
TL0=65536-1000;
TH0=(65536-1000)/256; //定时器0设定约1000us中断一次，用于数码管扫描
EA=1;
ET0=1;
TR0=1;

Led_Buf[0]=0;
Led_Buf[1]=0;
Led_Buf[2]=0;
Led_Buf[3]=0; //显示区设成0
do{
restart:
while(Ir_Pin);
temp=Ir_Get_Low();
if(temp<c(8500) || temp>c(9500)) continue;//引导脉冲低电平9000
temp=Ir_Get_High();
if(temp<c(4000) || temp>c(5000)) continue;//引导脉冲高电平4500
for(i=0;i<4;i++) //4个字节
for(j=0;j<8;j++) //每个字节8位
{
temp=Ir_Get_Low();
if(temp<c(200) || temp>c(800)) goto restart;
temp=Ir_Get_High();
if(temp<c(200) || temp>c(2000)) goto restart;
Ir_Buf[i]>>=1;
if(temp>c(1120)) Ir_Buf[i]|=0x80;
}
Led_Buf[0]=Ir_Buf[2]&0xf;
Led_Buf[1]=(Ir_Buf[2]/16)&0xf;
Led_Buf[2]=Ir_Buf[3]&0xf;
Led_Buf[3]=(Ir_Buf[3]/16)&0xf; //显示结果
inbuf1[0]=dis_8[Led_Buf[1]];
inbuf1[1]=dis_8[Led_Buf[0]];
inbuf1[2]=0x0d;
inbuf1[3]=0x0a;
send_string_com(inbuf1,INBUF_LEN);
P1=Ir_Buf[2];
beep=0;
delay_50ms(2);
beep=1;
//RELAY=0;
//delay_50ms(50);
//RELAY=1;

//while ( 1 )
//{

}

while(1);

}

Answer 2

搞个压力变送器或者两个实行差压变送比你这个准多了。
不好意思，答非所问，消灭零回复