树莓派与语音模块实现开关小灯

#include <wiringSerial.h>
#include <wiringPi.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#define SWITCHER 25//定义25口为继电器口
int main ()
{
    int fd;
    char cmd[128]={'\0'};
    int nread;
    wiringPiSetup();//初始化
    pinMode(SWITCHER,OUTPUT);//初始化端口
     if(wiringPiSetup() == -1){ //如果初始化失败，就输出错误信息 程序初始化时务必进行
        printf("setup wiringPi failed !");
        return 1;
     }
    fd = serialOpen("/dev/ttyAMA0",9600);//语音模块打开
    digitalWrite(SWITCHER,HIGH);//高电平关断 
    while(1){
        nread = read (fd, cmd, sizeof(cmd));//读取数据
        if(strlen(cmd)==0){//如果没有数据就显示超时
                printf("chaoShi\n");
                continue;
        }
        if (strstr(cmd,"open")!=NULL){//如果收到打开字样
            printf("open light\n");//树莓派界面输出开灯
            digitalWrite(SWITCHER,LOW);//低电平开灯
        }
        if(strstr(cmd,"close")!=NULL){//如果收到关断字样
            printf("close light\n");//打印关灯
            digitalWrite(SWITCHER,HIGH);//高点平关灯
        }
        memset(cmd,'\0',sizeof(cmd)/sizeof(char));//回收，关断
    }
    return 0;
}