树梅派学习 12. 光隔离传感器实验

电路图：

接线图：

代码：

#include <wiringPi.h>
#include <stdio.h>

#define LBPin   0  // light break pin set to GPIO0
#define Gpin    1
#define Rpin    2

void LED(int color)
{
  pinMode(Gpin, OUTPUT);
  pinMode(Rpin, OUTPUT);
  if (color == 0){
    digitalWrite(Rpin, HIGH);
    digitalWrite(Gpin, LOW);
  }
  else if (color == 1){
    digitalWrite(Rpin, LOW);
    digitalWrite(Gpin, HIGH);
  }
}

void Print(int x){
  if ( x == 0 ){
    printf("Light was blocked\n");
  }
}

int main(void){

  if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
    printf("setup wiringPi failed !");
    return 1; 
  }

  pinMode(LBPin, INPUT);
  int temp;
  while(1){
    //Reverse the input of LBPin
    if ( digitalRead(LBPin) == 0 ){  
      temp = 1;
    }
    if ( digitalRead(LBPin) == 1 ){
      temp = 0;
    }

    LED(temp);
    Print(temp);
  }
  return 0;
}

编译运行：

gcc photo_interrupter.c -o photo_interrupter -lwiringPi -lpthread

实体图：