无法可靠地让Arduino以太网盾接受连接

Question

我一直在玩Arduino以太网盾。运行Web服务器类型应用程序时，我无法使其可靠地接受连接。当我无法连接到它时，我无法ping通它。我收到的消息是“来自192.168.1.14的回复：目标主机不可达”。其中192.168.1.14是我尝试从中连接的计算机的IP。为什么我的本地子网上的IP无法访问？网盾是否无法在网络上正确识别自己？有什么我可以在Arduino代码中做的吗？

这是我的代码。如果您发现任何问题，请告诉我。

更新：我将它插入我的主家庭路由器而不是交换机，它立即在那里工作。无论如何，一旦我可以连接到它，只要打开它就可以继续工作。

#include <WString.h> 
#include <SPI.h> 
#include <Ethernet.h> 

// Enter a MAC address and IP address for your controller below. 
// The IP address will be dependent on your local network: 
byte mac[] = { 0x00, 0xAA, 0xBB, 0xCC, 0xDA, 0x02 }; 
IPAddress ip(192,168,1,177); 

// Initialize the Ethernet server library 
// with the IP address and port you want to use 
// (port 80 is default for HTTP): 
EthernetServer server(80); 

#define DOOR_BUTTON 2 

String readString = String(100); //string for fetching data from address 

void setup() 
{ 
    Serial.begin(9600); 

    digitalWrite(DOOR_BUTTON, LOW); 
    pinMode(DOOR_BUTTON, OUTPUT); 

    // start the Ethernet connection and the server: 

    Serial.println("Initiaizing ethernet..."); 

    // this uses a fixed address 
    Ethernet.begin(mac, ip); 

    // get an address with DHCP 
    //if (Ethernet.begin(mac) == 0) 
    // Serial.println("Failed to configure Ethernet using DHCP"); 

    // give the card a second to initialize 
    delay(1000); 

    server.begin(); 

    Serial.print("Garage Door Opener Control Ready at IP address "); 
    Serial.println(Ethernet.localIP()); 
} 

void loop() 
{ 
    // command received (one character) '1' - activate garage door button 
    char cmd = 0;   // 1 - pulse button 
    boolean done = false; // set to indicate that response is complete 

    // listen for incoming clients 
    EthernetClient client = server.available(); 
    if (client) { 

    Serial.println("new client"); 
    readString = ""; 

    while (client.connected()) { 
     if (client.available()) { 
     char c = client.read(); 
     Serial.write(c); 
     //int i = c; 
     //Serial.print("("); 
     //Serial.print(i); 
     //Serial.print(")"); 

     // store character received in receive string 
     if (readString.length() < 100) { 
      readString += (c); 
     } 

     // check for end of line 
     if (c == '\n') { 
      //Serial.print("Receved line: "); 
      //Serial.print(readString); 

      // process line if its the "GET" request 
      // a request looks like "GET /?1" or "GET /?2" 
      if (readString.indexOf("GET") != -1) { 
       if (readString.indexOf("?1") != -1) 
        cmd = '1'; 
       // check for other commands here. ie turn on light, etc. 
       //if (readString.indexOf("?2") != -1) 
       // cmd = '2'; 
      }    

      // if a blank line was received (just cr lf, length of 2), then its the end of the request 
      if (readString.length() == 2) { 
      if (cmd == '1'){ 
       Serial.println("Activate Button"); 
       digitalWrite(DOOR_BUTTON, HIGH); 
       delay(1000); 
       digitalWrite(DOOR_BUTTON, LOW); 
      } 
      // add other commands here 

      // send web page back to client 
      Serial.println("sending web page"); 
      SendWebPage(client); 
      Serial.println("web page sent"); 

      cmd = 0; 

      // break out and disconnect. This will tell the browser the request is complete without having to specify content-length 
      break; 

      } // end of request reached 

      // start line over    
      readString = ""; 
     } // end of line reached 
     } // end data is available from client 
    } // end cient is connected 
    // give the web browser time to receive the data 
    Serial.println("delay before disconnect"); 
    delay(100); 
    // close the connection: 
    client.stop(); 
    Serial.println("client disonnected"); 
    } // end client has been created 
} 

// send web page 
void SendWebPage(EthernetClient client) 
{ 
    client.println("HTTP/1.1 200 OK"); 
    client.println("Content-Type: text/html"); 
    // to specify the length, wooul have to construct the entire string and then get its length 
    //client.println("Content-Length: 1234"); 
    client.println("Connnection: close"); 
    client.println(); 

    client.println("<!DOCTYPE HTML>"); 
    client.println("<html>"); 
    client.println("<head>"); 
    client.println("<title>Garage Door Control</title>"); 

    client.println("<style type='text/css'>"); 
    client.println(".label {font-size: 40px; text-align:center;}"); 
    client.println("button {width: 200px; height: 100px; font-size: 40px; -webkit-appearance: none; background-color:white; }"); 
    client.println("</style>"); 

    client.println("<script type='text/javascript'>"); 

    client.println("function OnButtonClicked(parm) { window.location.href=\"X?\" + parm; }"); 

    client.println("</script>"); 

    client.println("</head>"); 

    client.println("<body style=\"background-color:orange\">"); 

    client.println("<div class=\"label\">"); 

    client.println("Garage Door Control<br/><br/>"); 

    // future idea: could read a limit switch on the garage door here and tell the user if the door is currently open or closed 
    /* 
    if (digitalRead(DOOR_OPEN_INPUT) == HIGH) 
    client.println("Door is Open"); 
    else 
    client.println("Door is Closed"); 
    client.println("<br>"); 
    */ 

    // door open/close button 
    client.println("<button onclick=\"OnButtonClicked('1');\">Activate</button><br/>"); 

    // add more buttons here 
    // button separator 
    //client.println("<div style=\"height:20px\"></div>"); 
    //client.println("<button onclick=\"OnButtonClicked('2');\">Off</button>"); 

    client.println("</div>"); 

    client.println("</body>"); 
    client.println("</html>"); 

    client.println(""); 
} 

Answer 1

该代码指定IP地址ip（192,168,1,177）;但是在问题中，您可以参考地址192.168.1.14。 sS这是一个错字还是你只是在ping错地址？