如何将超声波传感器HC-SR04与easyPic v7微控制器连接

Question

大家晚上好！

有没有人知道如何将超声波传感器与PIC微控制器easyPic v7与PIC18F45K22芯片连接，以使人计数器。

我

找到了一个有用的代码，我试图编辑它，但它仍然不起作用......

这是我的代码：

// Lcd module connections
sbit LCD_RS at LATB4_bit;
sbit LCD_EN at LATB5_bit;
sbit LCD_D4 at LATB0_bit;
sbit LCD_D5 at LATB1_bit;
sbit LCD_D6 at LATB2_bit;
sbit LCD_D7 at LATB3_bit;
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
void main()
{
  int a;
  Lcd_Init();
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Out(1,5,"ITCE444");
  Lcd_Out(2,3,"Term Project");
  Delay_ms(3000);
  Lcd_Cmd(_LCD_CLEAR);
  TRISA.RA0 = 0;  //RB0 as Input PIN (TRG)
  TRISA.RA4 = 0;  //RB4 as Input PIN (ECHO)
  while(1)
  {
    if(PORTA.RA4==1 && PORTA.RA0==1)
    {
      a = a + 1;
      Lcd_Cmd(_LCD_CLEAR);
      Lcd_Out(1,1,"Person in: ");
      Lcd_Out(1,12,a);
      Lcd_Out(1,15,"Person");
    }
    else
    {
      a = a - 1;
      Lcd_Cmd(_LCD_CLEAR);
      Lcd_Out(1,1,"Person out: ");
      Lcd_Out(1,13,a);
    }
    Delay_ms(400);
  }
}

谢谢和问候..

Answer 1

您在上面发布的代码 100% 不正确。这是代码应该是什么样子的。

HC-SR04是超声波测距传感器。它测量传感器和障碍物之间的距离。虽然您绝对可以使用距离信息进行计数器，但这似乎略高于您的技能。

所以有三个选择：

1. 学习使用图片微控制器并编写大量计时器代码获取传感器的距离读数。

2. 切换到Arduino并使用它的内置库来获取距离。

3. 更换硬件。您不需要超声波传感器（或微控制器）使人计数器。我建议您只需使用一对红外 LED 即可使自己变得简单当一个人走过他们时发出脉冲的电路。

Answer 2

感谢您的回复 哈桑·纳迪姆先生，我有代码的更新，当我实现它时它几乎可以工作。

看看并告诉我你的想法：

// LCD module connections
sbit LCD_RS at LATB4_bit;
sbit LCD_EN at LATB5_bit;
sbit LCD_D4 at LATB0_bit;
sbit LCD_D5 at LATB1_bit;
sbit LCD_D6 at LATB2_bit;
sbit LCD_D7 at LATB3_bit;
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections
// Ultrasonic module connection
sbit Ultrasonic at RD0_bit;
sbit Ultrasonic_Direction at TRISD0_bit;
// End of Ultrasonic module connections
#define Pole_Height 200
void main()
{
   unsigned long Tm;
   unsigned char Tl, Th;
   unsigned int h, Person_Height,dist;
   char Txt[7];
   int cont =0 ;
   ANSELB = 0;
   ANSELD = 0;
   Lcd_Init();
   Lcd_Cmd(_LCD_CURSOR_OFF);
   Lcd_Out(2,3,"Term Project");
   Lcd_Out(1,5,"ITCE444");
   Delay_Ms(2000);T0CON = 0x00;
   for(;;)
   {
      Ultrasonic_Direction = 0;
      TMR0H = 0;
      TMR0L = 0;
      Ultrasonic = 0;
      Delay_us(3);
      Ultrasonic = 1;
      Delay_us(10);
      Ultrasonic = 0;
      while(PORTD.RD5 == 0);
         T0CON.TMR0ON = 1;
      while(PORTD.RD5 == 1);
         T0CON.TMR0ON = 0;
      Tl = TMR0L;
      Th = TMR0H;
      Tm = Th*256 + Tl;
      Tm = Tm / 2;
      Tm = 34 * Tm;
      Tm = Tm / 1000;
      h = (unsigned int)Tm;
      Person_Height= Pole_Height - h;
      if (Person_Height > 168 && Person_Height < 196)
         cont = cont + 1 ;
      else if(Person_Height > 132 && Person_Height < 160 && cont>0)
         cont = cont - 1 ;
      IntToStr(cont, Txt);
      Lcd_Cmd(_LCD_CLEAR);
      Lcd_Out(1,1, "Person in");
      Lcd_Out(2,1, Txt);
      Delay_Ms(1000);
   }
}