• 硬件连线
  
  vcc 接3.3V ——板子内侧的一排引脚
  GND 接地
  IN接 pin4
  接线图：
  

• 树莓派引脚

gpio readall //查看gpio引脚

• demo
  vi demo1.c

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

#define SWITCHER 7

int main()
{
        int cmd;
        if(wiringPiSetup() == -1){
                printf("硬件初始化失败\n");
                return -1;
        }
        pinMode(SWITCHER,OUTPUT);
        digitalWrite(SWITCHER,HIGH);
        while(1){
                printf("请输入0/1:0-断开开关，1-打开开关\n");
                scanf("%d",&cmd);
                getchar();
                if(cmd == 1){
                        digitalWrite(SWITCHER,LOW);
                }else if(cmd == 0){
                        digitalWrite(SWITCHER,HIGH);
                }
                cmd = 10;

        }

}

 gcc demo1.c -lwiringPi //编译