Trig ------- P2^1;
Echo ------- P2^0;
VCC -------- +5v
GND -------- GND
請在上電之前，檢查好接線是否正確。
可以按鍵調節報警距離，LCD顯示當前距離
單片機源程序如下:
- #include<reg51.h>
- #include<intrins.h>
- #include"lcd.h"
- sbit Trig = P2^1;
- sbit Echo = P2^0;
- sbit LED5 = P2^7;
- sbit beep = P1^5;
- sbit jia_key=P3^2;
- sbit jian_key=P3^3;
- sbit Reset_key = P3^0;
- //全局變量 ,音符索引數
- unsigned char musicNum;
- //音符播放時定時寄存器處值TH0
- unsigned char code high_buff[] = {240,229,240, 229,240, 229};
- //音符播放時定時寄存器處值TL0
- unsigned char code low_buff[] = {6,13,6,13,6,13};
- unsigned char arm[]=" Alarm ";
- unsigned char arm1[]=" NowDis ";
- unsigned char num=0;
- unsigned char code ASCII[15] = {'0','1','2','3','4','5','6','7','8','9','.','-','M'};
- static unsigned char DisNum = 0;
- unsigned int time=0;
- unsigned long S=0;
- unsigned long m=20;
- bit flag =0;
- unsigned char disbuff[4] ={0,0,0,0,};
- unsigned char disbuff1[4] ={0,0,0,0,} ;
- /*延時函數單位為毫秒*/
- void delayms(unsigned int ms)
- {
- unsigned char i=100,j;
- for(;ms;ms--)
- {
- while(--i)
- {
- j=10;
- while(--j);
- }
- }
- }
- //延時函數用于蜂鳴器的延時
- void delayfm(unsigned int x)
- {
- unsigned char i;
- while(x--)
- {
- for(i = 0;i < 120;i++);
- }
- }
- /*蜂鳴器主函數*/
- void fengmingqi(void)
- {
- // TMOD = 0x00; //定時器0工作在模式0
- TH1 = (8192 - 700) / 32; //定時器賦初值
- TL1 = (8192 - 700) % 32;
- // EA = 1; //開總中斷
- ET1 = 1; //開定時器0定時溢出中斷
- beep = 0;
- for(musicNum = 1;musicNum < 6;musicNum++)
- {
- TR1 = 1;
- delayfm(500);
- TR1 = 0;
- delayfm(50);
- }
-
- }
- //無源蜂鳴器中斷采用t1定時器
- void Timer1(void) interrupt 3
- {
- //蜂鳴器輸出電平取反
- beep = ~beep;
- TH1 = high_buff[musicNum];
- TL1 = low_buff[musicNum];
- }
- /*計數程序用于將超聲波發出的信號時間與收到的作差通過計算公式從而求出距離*/
- void Conut(void)
- {
- time=TH0*256+TL0;
- TH0=0;
- TL0=0;
-
- S=(time*1.7)/100; //算出來是CM
- if((S>=700)||flag==1) //超出測量范圍顯示“-”
- {
- flag=0;
-
- DisplayOneChar(0+9, 1, ASCII[11]);
- DisplayOneChar(1+9, 1, ASCII[10]); //顯示點
- DisplayOneChar(2+9, 1, ASCII[11]);
- DisplayOneChar(3+9, 1, ASCII[11]);
- DisplayOneChar(4+9, 1, ASCII[12]); //顯示M
- }
- else
- {
- disbuff[0]=S%1000/100;
- disbuff[1]=S%1000%100/10;
- disbuff[2]=S%1000%10 %10;
- DisplayOneChar(0+9, 1, ASCII[disbuff[0]]);
- DisplayOneChar(1+9, 1, ASCII[10]); //顯示點
- DisplayOneChar(2+9, 1, ASCII[disbuff[1]]);
- DisplayOneChar(3+9, 1, ASCII[disbuff[2]]);
- DisplayOneChar(4+9, 1, ASCII[12]); //顯示M
-
- }
- delayms(80);
- }
- /*報警距離顯示函數*/
- void dispose()
- {
- disbuff1[0]=m%1000/100;
- disbuff1[1]=m%1000%100/10;
- disbuff1[2]=m%1000%10 %10;
- DisplayOneChar(0+9, 0, ASCII[disbuff1[0]]);
- DisplayOneChar(1+9, 0, ASCII[10]); //顯示點
- DisplayOneChar(2+9, 0, ASCII[disbuff1[1]]);
- DisplayOneChar(3+9, 0, ASCII[disbuff1[2]]);
- DisplayOneChar(4+9, 0, ASCII[12]); //顯示M
- }
- /*按鍵處理函數*/
- void key()
- {
- while(jia_key==0)
- {
- delayms(10);
- if(jia_key==0)
- {
- m++;
- dispose();
- if(m==81)
- {
- m=80;
-
- }
-
- }
- }
- while(jian_key==0)
- {
- delayms(10);
- if(jian_key==0)
- {
- m--;
- dispose();
- if(m==19)
- {
- m=20;
-
- }
-
- }
- }
- while(Reset_key==0)
- {
- delayms(10);
- if(Reset_key==0)
- {
- m=20;
- dispose();
- }
- }
-
- }
- void zd0() interrupt 1 //T0中斷用來計數器溢出,超過測距范圍
- {
- flag=1; //中斷溢出標志
- }
- void StartModule() //啟動模塊
- {
- Trig=1; //啟動一次模塊
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- Trig=0;
- }
- void main(void)
- {
- TMOD=0x01; //設T0為方式1，GATE=1；
- ……………………
- …………限于本文篇幅 余下代碼請從51黑下載附件…………
所有資料51hei提供下載:
超聲波測距報警（LCD1602顯示）.zip
(48.41 KB, 下載次數: 257)
2017-7-1 10:33 上傳
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