Web Client Repeating（网页客户端重复动作）
- 这个例子说明了如何用以太网shield重复发出HTTP请求。这个例子通过分配以太网客户端的MAC地址、IP地址、DNS地址，来使用DNS。它连接到http://www.arduino.cc/latest.txt。页面的内容可以通过你的Arduino的串口窗口观察。
硬件要求
- Arduino 或者 Genuino 开发板
- Arduino Ethernet Shield
电路
-
以太网shield可以让你通过SPI总线连接一个 Wiznet 以太网控制器到Arduino或者genuino开发板板。它使用SPI总线连接的引脚pin 10，11，12，和13，到Wiznet。以太网shield后来的模块也有一个SD卡在板上。数字引脚 pin 4 用来控制SD卡上的从选择引脚（slave select pin）。
-
shield应该连接到一个有以太网电缆的网络。您将需要更改程序中的网络设置来对应于您的网络。
图由 Fritzing 软件绘制
在上面的图片里，Arduino或genuino开发板会堆叠在以太网shield下面。
原理图
样例代码
/*
Repeating Web client
This sketch connects to a a web server and makes a request
using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or
the Adafruit Ethernet shield, either one will work, as long as it's got
a Wiznet Ethernet module on board.
This example uses DNS, by assigning the Ethernet client with a MAC address,
IP address, and DNS address.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
created 19 Apr 2012
by Tom Igoe
modified 21 Jan 2014
by Federico Vanzati
http://www.arduino.cc/en/Tutorial/WebClientRepeating
This code is in the public domain.
*/
#include <SPI.h>
#include <Ethernet.h>
// assign a MAC address for the ethernet controller.
// fill in your address here:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
// fill in an available IP address on your network here,
// for manual configuration:
IPAddress ip(192, 168, 1, 177);
// fill in your Domain Name Server address here:
IPAddress myDns(1, 1, 1, 1);
// initialize the library instance:
EthernetClient client;
char server[] = "www.arduino.cc";
//IPAddress server(64,131,82,241);
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10L * 1000L; // delay between updates, in milliseconds
// the "L" is needed to use long type numbers
void setup() {
// start serial port:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// give the ethernet module time to boot up:
delay(1000);
// start the Ethernet connection using a fixed IP address and DNS server:
Ethernet.begin(mac, ip, myDns);
// print the Ethernet board/shield's IP address:
Serial.print("My IP address: ");
Serial.println(Ethernet.localIP());
}
void loop() {
// if there's incoming data from the net connection.
// send it out the serial port. This is for debugging
// purposes only:
if (client.available()) {
char c = client.read();
Serial.write(c);
}
// if ten seconds have passed since your last connection,
// then connect again and send data:
if (millis() - lastConnectionTime > postingInterval) {
httpRequest();
}
}
// this method makes a HTTP connection to the server:
void httpRequest() {
// close any connection before send a new request.
// This will free the socket on the WiFi shield
client.stop();
// if there's a successful connection:
if (client.connect(server, 80)) {
Serial.println("connecting...");
// send the HTTP GET request:
client.println("GET /latest.txt HTTP/1.1");
client.println("Host: www.arduino.cc");
client.println("User-Agent: arduino-ethernet");
client.println("Connection: close");
client.println();
// note the time that the connection was made:
lastConnectionTime = millis();
} else {
// if you couldn't make a connection:
Serial.println("connection failed");
}
}
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更多
- Arduino Ethernet Shield – 产品描述。
- Getting started with the Ethernet Shield – 在几分钟内启动所有东西。
- Ethernet library – 以太网库的参考手册
- AdvancedChatServer – 一个服务器，用来发送所有传入的信息到所有连接的客户端（除了那个发送信息的客户端）。
- ChatServer – 一个简单的服务器，用来发送所有传入的信息到所有连接的客户端。
- WebClient – 查询网络，并通过串口监视器得到答案
- WebClientRepeating – 如何用以太网shield重复HTTP请求。
- WebServer – 一个简单的Web服务器，用来显示模拟输入的值。
- DhcpAddressPrinter – 获取DHCP地址，并打印出到串口监视器。
- DhcpChatServer – 连接到一个telnet服务器，并打印所有收到的信息到串口监视器上。用DHCP。
- TelnetClient – 连接到一个telnet服务器，并打印所有收到的信息到串口监视器上。
- BarometricPressureWebServer – 用SPI从压力传感器读取的Post数据。
- UDPSendReceiveString – 通过UDP协议（通用数据包）发送和接收文本字符串。
- UdpNtpClient – 查询一个网络时间协议（NTP）服务器，并通过串口服务器监视器获取这个信息。