Web Client | Arduino-технология

Этот пример показывает, как при помощи Ethernet Shield сделать HTTP-запрос к Google по слову «Arduino». Результаты запроса можно будет наблюдать в HTML-виде в окне Serial Monitor.

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Плата Arduino или Genuino
Плата Arduino Ethernet

Схема

Плата Ethernet позволяет подключать WizNet Ethernet контроллер к платам Arduino или Genuino через шину SPI. Данное подключение использует контакты 10, 11, 12 и 13. Более поздние модели платы Ethernet также имеют в своем составе SD-карту. Цифровой контакт 4 используется для управления выбора ведомого на SD-карте.

Плата должна быть подключена к сети с помощью кабеля Ethernet. Вам необходимо будет поменять сетевые настройки в программе, чтобы они соответствовали вашей сети.

Модуль Arduino Ethernet помещается поверх платы Arduino.

/*
  Web client

 This sketch connects to a website (http://www.google.com)
 using an Arduino Wiznet Ethernet shield.

 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13

 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe, based on work by Adrian McEwen

 */

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

// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
char server[] = "www.google.com";    // name address for Google (using DNS)

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192, 168, 0, 177);
IPAddress myDns(192, 168, 0, 1);

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;

// Variables to measure the speed
unsigned long beginMicros, endMicros;
unsigned long byteCount = 0;
bool printWebData = true;  // set to false for better speed measurement

void setup() {
  // You can use Ethernet.init(pin) to configure the CS pin
  //Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet

  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // start the Ethernet connection:
  Serial.println("Initialize Ethernet with DHCP:");
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // Check for Ethernet hardware present
    if (Ethernet.hardwareStatus() == EthernetNoHardware) {
      Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
      while (true) {
        delay(1); // do nothing, no point running without Ethernet hardware
      }
    }
    if (Ethernet.linkStatus() == LinkOFF) {
      Serial.println("Ethernet cable is not connected.");
    }
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac, ip, myDns);
  } else {
    Serial.print("  DHCP assigned IP ");
    Serial.println(Ethernet.localIP());
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.print("connecting to ");
  Serial.print(server);
  Serial.println("...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.print("connected to ");
    Serial.println(client.remoteIP());
    // Make a HTTP request:
    client.println("GET /search?q=arduino HTTP/1.1");
    client.println("Host: www.google.com");
    client.println("Connection: close");
    client.println();
  } else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
  beginMicros = micros();
}

void loop() {
  // if there are incoming bytes available
  // from the server, read them and print them:
  int len = client.available();
  if (len > 0) {
    byte buffer[80];
    if (len > 80) len = 80;
    client.read(buffer, len);
    if (printWebData) {
      Serial.write(buffer, len); // show in the serial monitor (slows some boards)
    }
    byteCount = byteCount + len;
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    endMicros = micros();
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    Serial.print("Received ");
    Serial.print(byteCount);
    Serial.print(" bytes in ");
    float seconds = (float)(endMicros - beginMicros) / 1000000.0;
    Serial.print(seconds, 4);
    float rate = (float)byteCount / seconds / 1000.0;
    Serial.print(", rate = ");
    Serial.print(rate);
    Serial.print(" kbytes/second");
    Serial.println();

    // do nothing forevermore:
    while (true) {
      delay(1);
    }
  }
}

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Web client

This sketch connects to a website (http://www.google.com)

using an Arduino Wiznet Ethernet shield.

Circuit:

* Ethernet shield attached to pins 10, 11, 12, 13

created 18 Dec 2009

by David A. Mellis

modified 9 Apr 2012

by Tom Igoe, based on work by Adrian McEwen

#include <SPI.h>

#include <Ethernet.h>

// Enter a MAC address for your controller below.

// Newer Ethernet shields have a MAC address printed on a sticker on the shield

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

// if you don't want to use DNS (and reduce your sketch size)

// use the numeric IP instead of the name for the server:

//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)

char server[] = "www.google.com"; // name address for Google (using DNS)

// Set the static IP address to use if the DHCP fails to assign

IPAddress ip(192, 168, 0, 177);

IPAddress myDns(192, 168, 0, 1);

// Initialize the Ethernet client library

// with the IP address and port of the server

// that you want to connect to (port 80 is default for HTTP):

EthernetClient client;

// Variables to measure the speed

unsigned long beginMicros, endMicros;

unsigned long byteCount = 0;

bool printWebData = true; // set to false for better speed measurement

void setup() {

// You can use Ethernet.init(pin) to configure the CS pin

//Ethernet.init(10); // Most Arduino shields

//Ethernet.init(5); // MKR ETH shield

//Ethernet.init(0); // Teensy 2.0

//Ethernet.init(20); // Teensy++ 2.0

//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet

//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet

// Open serial communications and wait for port to open:

Serial.begin(9600);

while (!Serial) {

; // wait for serial port to connect. Needed for native USB port only

}

// start the Ethernet connection:

Serial.println("Initialize Ethernet with DHCP:");

if (Ethernet.begin(mac) == 0) {

Serial.println("Failed to configure Ethernet using DHCP");

// Check for Ethernet hardware present

if (Ethernet.hardwareStatus() == EthernetNoHardware) {

Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");

while (true) {

delay(1); // do nothing, no point running without Ethernet hardware

}

if (Ethernet.linkStatus() == LinkOFF) {

Serial.println("Ethernet cable is not connected.");

}

// try to congifure using IP address instead of DHCP:

Ethernet.begin(mac, ip, myDns);

} else {

Serial.print(" DHCP assigned IP ");

Serial.println(Ethernet.localIP());

}

// give the Ethernet shield a second to initialize:

delay(1000);

Serial.print("connecting to ");

Serial.print(server);

Serial.println("...");

// if you get a connection, report back via serial:

if (client.connect(server, 80)) {

Serial.print("connected to ");

Serial.println(client.remoteIP());

// Make a HTTP request:

client.println("GET /search?q=arduino HTTP/1.1");

client.println("Host: www.google.com");

client.println("Connection: close");

client.println();

} else {

// if you didn't get a connection to the server:

Serial.println("connection failed");

}

beginMicros = micros();

}

void loop() {

// if there are incoming bytes available

// from the server, read them and print them:

int len = client.available();

if (len > 0) {

byte buffer[80];

if (len > 80) len = 80;

client.read(buffer, len);

if (printWebData) {

Serial.write(buffer, len); // show in the serial monitor (slows some boards)

}

byteCount = byteCount + len;

}

// if the server's disconnected, stop the client:

if (!client.connected()) {

endMicros = micros();

Serial.println();

Serial.println("disconnecting.");

client.stop();

Serial.print("Received ");

Serial.print(byteCount);

Serial.print(" bytes in ");

float seconds = (float)(endMicros - beginMicros) / 1000000.0;

Serial.print(seconds, 4);

float rate = (float)byteCount / seconds / 1000.0;

Serial.print(", rate = ");

Serial.print(rate);

Serial.print(" kbytes/second");

Serial.println();

// do nothing forevermore:

while (true) {

delay(1);

}

Web Client. Пример использования библиотеки Ethernet.h

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Схема

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