智能开关项目
1. 智能开关
智能开关由WiFi模组和继电器组成:本实例中利用ESP8266模组作为一个TCP Server,通过STA模式将ESP8266连接到路由器中;PC或者手机连接到相同的路由器后,建立TCP客户端,通过发送相应的字符到TCP Server来控制继电器的通断,从而实现智能开关的功能
继电器的介绍:继电器是为了将弱电和强电分离开来,利用弱电来控制强电;其工作原理和接线方法如下图示
2. 智能开关功能实现
硬件连接:采用GPIO5驱动继电器;继电器电源VCC连接到VIN,继电器GND连接到GND
实验步骤如下:
–> 在ESP8266_RTOS_SDK目录下新建relay文件夹,把tcpserver实验中的tcpserver目录下所有文件拷贝到该文件夹中
–> 在user目录下新建relay.c文件,并添加如下代码
void Relay_Control(uint32 mask)
{
GPIO_OUTPUT(GPIO_Pin_5,mask);
}
–> 在include目录下新建relay.h文件,并添加声明
void Relay_Control(uint32 mask);
–> 在tcpserver下完成relayon/relayoff解析
void ATaskTcpServer( void *pvParameters ){
int iVariableExample = 0;
int fd = -1;
int cfd = -1;
int NetTimeOnt = 20000;
int ret;
struct sockaddr_in ServerAddr;
struct sockaddr ClientAddr;
socklen_t ClientAddrlen = sizeof(struct sockaddr);
char Tcpmsg[48];
STATION_STATUS StaStatus;
do{
StaStatus = wifi_station_get_connect_status();
vTaskDelay(100);
}while(StaStatus != STATION_GOT_IP);
fd = socket(PF_INET,SOCK_STREAM,0);
if(fd == -1){
printf("get socket fail!\n");
vTaskDelete(NULL);
return;
}
setsockopt(fd,SOL_SOCKET,SO_RCVTIMEO,&NetTimeOnt,sizeof(int));
memset(&ServerAddr,0,sizeof(ServerAddr));
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_addr.s_addr = INADDR_ANY;
ServerAddr.sin_port = htons(SERVERPORT);
ServerAddr.sin_len = sizeof(ServerAddr);
if(bind(fd,(struct sockaddr*)&ServerAddr,ServerAddr.sin_len) != 0){
printf("bind socket fail!\n");
vTaskDelete(NULL);
return;
}
if(listen(fd,5) != 0){
printf("listen socket fail!\n");
vTaskDelete(NULL);
return;
}
for(;;){
cfd = accept(fd,&ClientAddr,&ClientAddrlen);
if(cfd != -1){
ret = recv(cfd,Tcpmsg,48,0);
if(ret > 0){
printf("TcpClient:%s\n",Tcpmsg);
if(strncmp(Tcpmsg,"relayon",7) == 0){
Relay_Control(RELAY_ON);
send(cfd,"relayon!",sizeof("relayon!"),0);
}
else if(strncmp(Tcpmsg,"relayoff",8) == 0){
Relay_Control(RELAY_OFF);
send(cfd,"relayoff!",sizeof("relayoff!"),0);
}
else
send(cfd,"cmd is error!",sizeof("cmd is error!"),0);
}
else{
printf("TcpClient data is no!\n");
}
}
close(cfd);
}
vTaskDelete( NULL );
}
–> 在user_main.c文件中的user_init()函数下添加如下代码
#define SSID "Hotspot" //ESP8266要加入的无线网
#define PASSWORD "88888888"
void ICACHE_FLASH_ATTR
user_init(void){
printf("SDK version:%s\n", system_get_sdk_version());
Led_init();
wifi_set_opmode(STATION_MODE);
struct station_config *config = (struct station_config *)\
zalloc(sizeof(struct station_config));
sprintf(config->ssid,SSID);
sprintf(config->password,PASSWORD);
wifi_station_set_config(config);
free(config);
wifi_station_set_auto_connect(TRUE);
TcpServer_init();
xTaskCreate(ATaskLed, "LED", 256, NULL, 2, NULL);
}
–> 在ESP8266编译器中编译完成,烧写bin文件到ESP8266,模组复位后,打开串口助手,PC端建立TCP客户端,与ESP8266服务器连上后,发送relayon/relayoff即可控制继电器