将Arduino接入以太网

通过插入W5100 以太网盾板，实现Arduino NUO 接入以太网的想法

#include 
//#include 

//mac地址可以是随便的48位地址，只要设备间不相互冲突就行
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

IPAddress staticIP(192,168,31,159);

EthernetServer server(80);

void connectToInternet()
{
  if (Ethernet.begin(mac) == 0)//看看DHCP是否能动态分配ip给Arduino
  {
    Serial.print("[ERROR] Failed to Configure Ethernet using DHCP");
    Ethernet.begin(mac, staticIP);//DHCP不能动态分配，就静态设置ip给Arduino

  }
  delay(1000);
  Serial.println("[INFO] Connection Successsful");
  Serial.print("");
  printConnectionInformation();
  Serial.println("-------------------------");
  Serial.println("");
}
void printConnectionInformation()
{
  Serial.print("[INFO] IP Address: ");
  Serial.println(Ethernet.localIP());
  Serial.print("[INFO] Subnet Mask: ");
  Serial.println(Ethernet.subnetMask());
  Serial.print("[INFO] Gateway: ");
  Serial.println(Ethernet.gatewayIP());
  Serial.print("[INFO] DNS: ");
  Serial.println(Ethernet.dnsServerIP());
}
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  connectToInternet();
  server.begin();
  
}


void loop()
{
  //当有客户连接服务器时，服务器available函数会返回一个客户端对象用以向客户反馈信息
  EthernetClient client = server.available();
  if (client) {
    // an http request ends with a blank line
    boolean current_line_is_blank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // if we've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so we can send a reply
        if (c == 'n' && current_line_is_blank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();

          // output the value of each analog input pin
          client.print("welcome to tinyos electronics");
          client.println("
");
          client.print("//*************************************");
          client.println("
");
          client.print("");
          client.println("
");
          client.print("//*************************************");
          client.println("
");
          for (int i = 0; i < 6; i++) {
            client.print("analog input ");
            client.print(i);
            client.print(" is ");
            client.print(analogRead(i));
            client.println("
");
          }
          break;
        }
        //有的教程里也有用(c == '\n')和 (c != '\r')的
        //2018-12-16补充试验，用(c == '\n')和 (c != '\r')的话，客户端连接不上服务器，不能用啊
        if (c == 'n') {
          // we're starting a new line
          current_line_is_blank = true;
        } else if (c != 'r') {
          // we've gotten a character on the current line
          current_line_is_blank = false;
        }
      }
    }
    client.stop();
  }
}

下载程序运行如下图(路由器动态分配了ip)

连接正常时以太网盾板FULLD,100M,LINK,PWR四个led灯都需要亮，不亮的话重启下试试