아두이노이더넷 쉴드로 기상청 날씨데이타 가져오기

먼저 아두이노 IDE의 예제중 Ethernet>WebClientRepeating을 사용한다.

​

/*

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

};

// 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 library instance:

EthernetClient client;

​

char server[] = "www.arduino.cc"; // also change the Host line in httpRequest()

//IPAddress server(64,131,82,241);

​

unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds

const unsigned long postingInterval = 10*1000; // delay between updates, in milliseconds

​

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

​

// start serial port:

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);

Serial.print("My IP address: ");

Serial.println(Ethernet.localIP());

} else {

Serial.print(" DHCP assigned IP ");

Serial.println(Ethernet.localIP());

}

// give the Ethernet shield a second to initialize:

delay(1000);

}

​

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");

}

}