内网控制：nodemcu（esp8266）与arduino串口通信

连线图

代码

arduino端

// An highlighted block
#define STOP      '1'

#include 
SoftwareSerial mySerial(2, 3); //RX=2,TX=3
int led = 6;

void setup() {
     
  Serial.begin(9600);
  mySerial.begin(9600);
  pinMode(led,OUTPUT);
}

void loop() {
     
  while(1)
    {
     
        mySerial.listen();
        if (mySerial.available() > 0 ) 
        {
     
          char control = mySerial.read();
          Serial.write(control);
          motorRun(control);
        }
    }
}

void motorRun(char control)
{
     
  switch(control)
  {
     
    case STOP:
      digitalWrite(led, HIGH);
      delay(1000);
      digitalWrite(led, LOW);
      break;
  }
}

nodemcu端

#include 

// Add wifi access point credentiaals
const char* ssid     = "laboratory-514";
const char* password = "13323587131";

WiFiServer server(80);// Set port to 80


String header; // This storees the HTTP request

// Declare the pins to which the LEDs are connected 
int inD1 = D1;
int inD2 = D2; 

String D1state = "关";// state of green LED
String D2state = "关";// state of red LED


void setup() {
     
  Serial.begin(9600);
 // Set the pinmode of the pins to which the LEDs are connected and turn them low to prevent flunctuations
  pinMode(inD1, OUTPUT);
  pinMode(inD2, OUTPUT);
  digitalWrite(inD1, LOW);
  digitalWrite(inD2, LOW);
  //connect to access point
  WiFi.begin(ssid, password);
  //Serial.print("Connecting to ");
  //Serial.println(ssid);
  while (WiFi.status() != WL_CONNECTED) {
     
    delay(500);
    //Serial.print(".");
  }
  // Print local IP address and start web server
  //Serial.println("");
  //Serial.println("WiFi connected.");
  //Serial.println("IP address: ");
  Serial.println(WiFi.localIP());// this will display the Ip address of the Pi which should be entered into your browser
  server.begin();
}

void loop(){
     
  WiFiClient client = server.available();   // Listen for incoming clients
  
  //ss
  char a[20] = ""; //定义字符数组，接受来自上位机的数据
  int i = 0;
  char s[] = "q"; //每隔3s发送一次字符数组s
  //ss
  
  if (client) {
                                  // If a new client connects,
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {
                 // loop while the client's connected
      if (client.available()) {
                  // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        //Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {
                         // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
     
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            
            // turns the GPIOs on and off
            if (header.indexOf("GET /D1/on") >= 0) {
     
            //  Serial.println("D1 开");
              D1state = "开";
              digitalWrite(inD1, HIGH);
              Serial.print("1");
            } else if (header.indexOf("GET /D1/off") >= 0) {
     
           //   Serial.println("D1 关");
              D1state = "关";
              digitalWrite(inD1, LOW);
            } else if (header.indexOf("GET /D2/on") >= 0) {
     
           //   Serial.println("D2 开");
              D2state = "开";
              digitalWrite(inD2, HIGH);
            } else if (header.indexOf("GET /D2/off") >= 0) {
     
           //   Serial.println("D2 关");
              D2state = "关";
              digitalWrite(inD2, LOW);
            }
       
            // Display the HTML web page
            client.println("");
            client.println("");
          
            client.println("");
            // CSS to style the on/off buttons 
            // Feel free to change the background-color and font-size attributes to fit your preferences
            client.println("");
            
            // Web Page Heading
            client.println("
nodemcu 网页测试 BY：任剑杰
");
            
            // Display current state, and ON/OFF buttons for GPIO 5  
            client.println("
D1 - 信息 " + D1state + "
");
            // If the green LED is off, it displays the ON button       
            if (D1state == "关") {
     
              client.println("
开
");
            } else {
     
              client.println("
关
");
            } 
               
            // Display current state, and ON/OFF buttons for GPIO 4  
            client.println("
D2 - 信息 " + D2state + "
");
            // If the red LED is off, it displays the ON button       
            if (D2state == "关") {
     
              client.println("
开
");
            } else {
     
              client.println("
关
");
            }
            client.println("");
            
            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            break;
          } else {
      // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {
       // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
  //  Serial.println("Client disconnected.");
    //Serial.println("");
  }
}

此时arduino和PC电脑的USB串口连接没断，打开串口打印助手，里面是登录地址 ：192.~~~~
然后输入到电脑的浏览器地址上，可以链接。结果如下：

1.光nodemcu，看nodemcu上传程序是否成功，就arduino那个blink示例就行改一下

2.nodemcu与Arduino串口通信，看红灯。这里蓝灯代表着传输信号正常。看代码里面备注有