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采用51單片機(jī)+超聲波模塊
提供了另外一種超聲波測速及其程序仿真文件
仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）
超聲波模塊電路連接
Trig ------- P2^1;
Echo ------- P2^0;
VCC -------- +5v
GND -------- GND
void Conut(void) //距離數(shù)據(jù)處理函數(shù)
{
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, 1, ASCII[11]);
DisplayOneChar(1, 1, ASCII[10]); //顯示點(diǎn)
DisplayOneChar(2, 1, ASCII[11]);
DisplayOneChar(3, 1, ASCII[11]);
DisplayOneChar(4, 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, 1, ASCII[disbuff[0]]);
DisplayOneChar(1, 1, ASCII[10]); //顯示點(diǎn)
DisplayOneChar(2, 1, ASCII[disbuff[1]]);
DisplayOneChar(3, 1, ASCII[disbuff[2]]);
DisplayOneChar(4, 1, ASCII[12]); //顯示M
}
}
//中斷函數(shù)
void zd0() interrupt 1 //T0中斷用來計(jì)數(shù)器溢出,超過測距范圍
{
flag=1; //中斷溢出標(biāo)志
}
//主函數(shù)
void main(void)
{
TMOD=0x01; //設(shè)T0為方式1，GATE=1；
TH0=0;
TL0=0;
ET0=1; //允許T0中斷
EA=1; //開啟總中斷
InitLcd1602();
LcdShowStr(0,0,PuZh);
while(1)
{
StartModule();
while(!Echo); //當(dāng)RX為零時(shí)等待
TR0=1; //開啟計(jì)數(shù)
while(Echo); //當(dāng)RX為1計(jì)數(shù)并等待
TR0=0; //關(guān)閉計(jì)數(shù)
Conut(); //計(jì)算
delayms(80);
}
}
LCD1602顯示函數(shù)
void Read_Busy() //忙檢測函數(shù)，判斷bit7是0，允許執(zhí)行；1禁止
{
unsigned char sta; //
LCD1602_DB = 0xff;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
LCD1602_EN = 1;
sta = LCD1602_DB;
LCD1602_EN = 0; //使能，用完就拉低，釋放總線
}while(sta & 0x80);
}
void Lcd1602_Write_Cmd(unsigned char cmd) //寫命令
{
Read_Busy();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
void Lcd1602_Write_Data(unsigned char dat) //寫數(shù)據(jù)
{
Read_Busy();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
void LcdSetCursor(unsigned char x,unsigned char y) //坐標(biāo)顯示
{
unsigned char addr;
if(y == 0)
addr = 0x00 + x;
else
addr = 0x40 + x;
Lcd1602_Write_Cmd(addr|0x80);
}
//按指定位置顯示一個(gè)字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
if (Y) X |= 0x40; //當(dāng)要顯示第二行時(shí)地址碼+0x40;
X |= 0x80; //算出指令碼
Lcd1602_Write_Cmd(X); //發(fā)命令字
Lcd1602_Write_Data(DData); //發(fā)數(shù)據(jù)
}
void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str) //顯示字符串
{
LcdSetCursor(x,y); //當(dāng)前字符的坐標(biāo)
while(*str != '\0')
{
Lcd1602_Write_Data(*str++);
}
}
void InitLcd1602() //1602初始化
{
Lcd1602_Write_Cmd(0x38); //打開，5*8,8位數(shù)據(jù)
Lcd1602_Write_Cmd(0x0c);
Lcd1602_Write_Cmd(0x06);
Lcd1602_Write_Cmd(0x01); //清屏
}
![7L)9G{]TXPK1HJB2Y2X}X{M.png](http://c.51hei.com/d/forum/202103/31/113455gnoexmq8j1mur7mr.png "7L)9G{]TXPK1HJB2Y2X}X{M.png")
全部資料51hei下載地址：
仿真代碼.7z
(156.31 KB, 下載次數(shù): 146)
2022-11-22 19:34 上傳
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程序原理圖及其仿真
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