ESP8266 上线

1.首先配置esp8266 WIFI模块

使用USB转 TTL 连接 esp8266 WIFI模块，波特率115200

　//查询固件版本

　AT+GMR

　//设置WiFi应用模式为Station

AT+CWMODE=3
//连接到WiFi路由器，请将SSID替换为路由器名称，Password替换为路由器WiFi密码
AT+CWJAP="SSID","Password"
//连接单连模式
AT+CIPMUX=0
//设置为透传模式
AT+CIPMODE=1
//进入透传模式
AT+SAVETRANSLINK=1,"121.42.180.30",8181,"TCP"

每输入一条指令，均会有反馈，如果没有，重新连接串口，继续发送指令

2. ESP8266 WIFI模块连接 arduino

#include <aJSON.h>
//=============  此处必须修改============
String DEVICEID="xxxx"; // 你的设备编号  ID ==
String  APIKEY="xxxxxxxx"; // 设备密码==  APIKEY
//=======================================
unsigned long lastCheckInTime = 0; //记录上次报到时间
const unsigned long postingInterval = 40000; // 每隔40秒向服务器报到一次
String inputString = "";
boolean stringComplete = false;
boolean CONNECT = true; 
char* parseJson(char *jsonString);
void setup() {
 //  pinMode(LED, OUTPUT);
   Serial.begin(115200);
   delay(5000);
}
void loop() {
   if(millis() - lastCheckInTime > postingInterval || lastCheckInTime==0) {
     checkIn();
   }
   serialEvent();
     if (stringComplete) {
       inputString.trim();
       //Serial.println(inputString);
       if(inputString=="CLOSED"){
         Serial.println("connect closed!");
         CONNECT=false;        
       }else{
         int len = inputString.length()+1;    
         if(inputString.startsWith("{") && inputString.endsWith("}")){
           char jsonString[len];
           inputString.toCharArray(jsonString,len);
           aJsonObject *msg = aJson.parse(jsonString);
           processMessage(msg);
           aJson.deleteItem(msg);          
         }
       }      
       // clear the string:
       inputString = "";
       stringComplete = false;    
   }
}
void checkIn() {
   if (!CONNECT) {
     Serial.print("+++");
     delay(500);  
     Serial.print("
"); 
     delay(1000);
     Serial.print("AT+RST
"); 
     delay(6000);
     CONNECT=true;
     lastCheckInTime=0;
   }
   else{
     Serial.print("{"M":"checkin","ID":"");
     Serial.print(DEVICEID);
     Serial.print("","K":"");
     Serial.print(APIKEY);
     Serial.print(""}
");
     lastCheckInTime = millis();   
   }
}
void processMessage(aJsonObject *msg){
   aJsonObject* method = aJson.getObjectItem(msg, "M");
   aJsonObject* content = aJson.getObjectItem(msg, "C");     
   aJsonObject* client_id = aJson.getObjectItem(msg, "ID");  
   //char* st = aJson.print(msg);
   if (!method) {
     return;
   }
     //Serial.println(st); 
     //free(st);
     String M=method->valuestring;
     String C=content->valuestring;
     String F_C_ID=client_id->valuestring;
     if(M=="say"){
       if(C=="play"){
         sayToClient(F_C_ID,"LED on!");    
       }
       if(C=="stop"){
         sayToClient(F_C_ID,"LED off!");    
       }
       }
}
void sayToClient(String client_id, String content){
   Serial.print("{"M":"say","ID":"");
   Serial.print(client_id);
   Serial.print("","C":"");
   Serial.print(content);
   Serial.print(""}
");
   lastCheckInTime = millis();
}
void serialEvent() {
   while (Serial.available()) {
     char inChar = (char)Serial.read();
     inputString += inChar;
     if (inChar == '
') {
       stringComplete = true;
     }
   }
}

上传代码到 Arduino uno R3时，要将连接到Arduino上的 TX，RX 拔出，要不会上传出错(Arduino nano板因为带不动Esp8266所以不能使用)