基于单片机的超声波测距一米以上就不灵敏测不了了怎么办？
基于单片机的超声波测距仪设计需要哪些
基于单片机超声波测距是怎么实现 有一种模块，通过IO控制就可以发出超声波，然后经过反射接收到信号，就可以测量距离，懂事电子设计 Vgz
关于基于单片机的超声波测距的问题 当然是要带程序测量，不然怎么会有波形，把发射40KHZ的方波程序烧进去，然后测量你输出的那个引脚就知道是否发射成功了
基于单片机的超声波测距 人和人距离怎么测量 请说明以下几个问题，我帮你判断一下：1.用多少频率的超声波换能器。2.在接上超声波换能器之后，发射的脉冲电压是多少v3.每次发射脉冲数是多少？4.现在最大测量范围是多少厘米？
求：基于89c52单片机的超声波测距的程序。 void CLR_SCREEN(void)；void LCD_DISOFF(void)；void LCD_DISON(void)；void LCD_CUROFF(void)；void LCD_CURON(void)；void LCD_INT(void)；void LCD_PRINT(unsigned char row，unsigned char col，unsigned char count，unsigned int dats)；void LCD_PRINTF(unsigned char row，unsigned char col，unsigned char InBuffer[33])；void LCD_PRINTCHAR(unsigned char row，unsigned char col，unsigned char Buffer)；void CPU_DELAYTIME(unsigned int count)；void LCD_WRI(unsigned char adr)；void LCD_WRD(unsigned char asc)；显示数值void LCD_PRINT(unsigned char row，unsigned char col，unsigned char count，unsigned int dats){unsigned int sxh4；unsigned int sxh3；unsigned int sxh2；unsigned int sxh1；LCD_DISON()；CPU_DELAYTIME(100)；switch(row){case 1：row=0x80；break；case 2：row=0xC0；break；default：break；}LCD_WRI(row+col-1)；CPU_DELAYTIME(200)；sxh4=dats/10；sxh3=sxh4/10；sxh2=sxh3/10；sxh1=sxh2/10；if(count>；=5){LCD_WRD(sxh1+48)；}if(count>；=4){LCD_WRD(sxh2-sxh1*10+48)；}if(count>；=3){LCD_WRD(sxh3-sxh2*10+48)；}if(count>；=2){LCD_WRD(sxh4-sxh3*10+。
