我有 PIC 18f4550,需要在 picBasic pro 中编写代码。
我正在连接直流电机、超声波传感器和红外传感器......等
我已经完成了所有工作,但仍然对如何连接超声波传感器感到困惑。
这是PIC中的超声波引脚
trisb.3=0 'trigger ultrasound
trisb.4=1 ' Echo from Ultrasound
我需要一个示例代码
1-为超声波模块提供 TRIGGER
2-侦听回声
3-接收到 ECHO HIGH 时启动计时器
4-ECHO 变低时停止计时器
5-读取计时器值
6-将其转换为距离
7-显示它
MikroC代码
// LCD module connections
sbit LCD_RS at RD2_bit;
sbit LCD_EN at RD3_bit;
sbit LCD_D4 at RD4_bit;
sbit LCD_D5 at RD5_bit;
sbit LCD_D6 at RD6_bit;
sbit LCD_D7 at RD7_bit;
sbit LCD_RS_Direction at TRISD2_bit;
sbit LCD_EN_Direction at TRISD3_bit;
sbit LCD_D4_Direction at TRISD4_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D7_Direction at TRISD7_bit;
// End LCD module connections
void main()
{
int a;
char txt[7];
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
TRISB = 0b00010000; //RB4 as Input PIN (ECHO)
Lcd_Out(1,1,"Developed By");
Lcd_Out(2,1,"Mina Karam");
Delay_ms(3000);
Lcd_Cmd(_LCD_CLEAR);
T1CON = 0x10; //Initialize Timer Module
while(1)
{
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer
PORTB.F0 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F0 = 0; //TRIGGER LOW
while(!PORTB.F4); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTB.F4); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops
a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration
if(a>=2 && a<=400) //Check whether the result is valid or not
{
IntToStr(a,txt);
Ltrim(txt);
Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(1,1,"Distance = ");
Lcd_Out(1,12,txt);
Lcd_Out(1,15,"cm");
}
else
{
Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(1,1,"Out of Range");
}
Delay_ms(400);
}
}
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句