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Arduino - Ethernet Module
This tutorial shows you how to use the Arduino and Ethenet module to connect to the Internet or your LAN network. Here's what we'll cover:
- Connecting the Arduino to a W5500 Ethernet Module
- Programming the Arduino to send HTTP requests over Ethernet
- Programming the Arduino to create a web server through Ethernet
Hardware Required
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| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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About W5500 Ethernet module
The W5500 Ethernet module has two ways to connect:
- RJ45 Ethernet Interface: Use an Ethernet cable to connect to a router or switch.
- SPI Interface: Use this to connect to an Arduino board. It has 10 pins. These pin need to be connected to Arduino as below table:
| Ethenet Module Pins | Arduino Pins |
|---|---|
| NC pin | NOT connected |
| INT pin | NOT connected |
| RST pin | Reset pin |
| GND pin | GND pin |
| 5V pin | 5V pin |
| 3.3V pin | NOT connected |
| MISO pin | 12 (MISO) |
| MOSI pin | 11 (MOSI) |
| SCS pin | 10 (SS) |
| SCLK pin | 13 (SCK) |
image source: diyables.io
Wiring Diagram between Arduino and W5500 Ethernet module
This image is created using Fritzing. Click to enlarge image
The below is real connection between Arduino and W5500 Ethernet module
Arduino code for Ethernet Module - Making HTTP request via Ethernet
This code acts as a web client. It sends HTTP requests to the web server located at http://example.com/.
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-ethernet-module
*/
#include <SPI.h>
#include <Ethernet.h>
// replace the MAC address below by the MAC address printed on a sticker on the Arduino Shield 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
EthernetClient client;
int HTTP_PORT = 80;
String HTTP_METHOD = "GET"; // or POST
char HOST_NAME[] = "example.com";
String PATH_NAME = "/";
void setup() {
Serial.begin(9600);
delay(1000);
Serial.println("Arduino - Ethernet Tutorial");
// initialize the Ethernet shield using DHCP:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to obtaining an IP address");
// check for Ethernet hardware present
if (Ethernet.hardwareStatus() == EthernetNoHardware)
Serial.println("Ethernet shield was not found");
// check for Ethernet cable
if (Ethernet.linkStatus() == LinkOFF)
Serial.println("Ethernet cable is not connected.");
while (true)
;
}
// connect to web server on port 80:
if (client.connect(HOST_NAME, HTTP_PORT)) {
// if connected:
Serial.println("Connected to server");
// make a HTTP request:
// send HTTP header
client.println(HTTP_METHOD + " " + PATH_NAME + " HTTP/1.1");
client.println("Host: " + String(HOST_NAME));
client.println("Connection: close");
client.println(); // end HTTP header
while (client.connected()) {
if (client.available()) {
// read an incoming byte from the server and print it to serial monitor:
char c = client.read();
Serial.print(c);
}
}
// the server's disconnected, stop the client:
client.stop();
Serial.println();
Serial.println("disconnected");
} else { // if not connected:
Serial.println("connection failed");
}
}
void loop() {
}
Quick Steps
Please follow these steps one by one:
- Connect the Ethernet module to your Arduino as shown in the diagram provided.
- Use an Ethernet cable to connect the Ethernet module to your router or switch.
- Use a USB cable to connect the Arduino board to your computer.
- Open the Arduino IDE on your computer.
- Choose the correct Arduino board and COM port.
- Click on the Libraries icon on the left side of the Arduino IDE.
- In the search box, type “Ethernet” and find the Ethernet library by Various.
- Click the Install button to add the Ethernet library.
- Open the Serial Monitor in the Arduino IDE.
- Copy the provided code and paste it into the Arduino IDE.
- Click the Upload button in the Arduino IDE to transfer the code to the Arduino.
- Check out the Serial Monitor where the results will appear as below.
COM6
Arduino - Ethernet Tutorial
Connected to server
HTTP/1.1 200 OK
Accept-Ranges: bytes
Age: 208425
Cache-Control: max-age=604800
Content-Type: text/html; charset=UTF-8
Date: Fri, 12 Jul 2024 07:08:42 GMT
Etag: "3147526947"
Expires: Fri, 19 Jul 2024 07:08:42 GMT
Last-Modified: Thu, 17 Oct 2019 07:18:26 GMT
Server: ECAcc (lac/55B8)
Vary: Accept-Encoding
X-Cache: HIT
Content-Length: 1256
Connection: close
<!doctype html>
<html>
<head>
<title>Example Domain</title>
<meta charset="utf-8" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body>
<div>
<h1>Example Domain</h1>
<p>This domain is for use in illustrative examples in documents. You may use this
domain in literature without prior coordination or asking for permission.</p>
<p><a href="https://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
disconnected
Autoscroll
Clear output
9600 baud
Newline
※ NOTE THAT:
If another device on the same network shares your MAC address, there may be issues.
Arduino code for Ethernet Module - Web Server
The code below create a web server on the Arduino. This web server sends a simple webpage to the web browsers.
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-ethernet-module
*/
#include <SPI.h>
#include <Ethernet.h>
// replace the MAC address below by the MAC address printed on a sticker on the Arduino Shield 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
EthernetServer server(80);
void setup() {
Serial.begin(9600);
delay(1000);
Serial.println("Arduino - Ethernet Tutorial");
// initialize the Ethernet shield using DHCP:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to obtaining an IP address");
// check for Ethernet hardware present
if (Ethernet.hardwareStatus() == EthernetNoHardware)
Serial.println("Ethernet shield was not found");
// check for Ethernet cable
if (Ethernet.linkStatus() == LinkOFF)
Serial.println("Ethernet cable is not connected.");
while (true)
;
}
server.begin();
Serial.print("Arduino - Web Server IP Address: ");
Serial.println(Ethernet.localIP());
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an HTTP request ends with a blank line
bool currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the HTTP request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard HTTP response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("<body>");
client.println("<h1>Arduino - Web Server with Ethernet</h1>");
client.println("</body>");
client.println("</html>");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
Quick Steps
- Copy the above code and paste it into Arduino IDE.
- Click the Upload button in Arduino IDE to upload the code to Arduino.
- Check the result on Serial Monitor, it will display as follows:
COM6
Arduino - Ethernet Tutorial
Arduino - Web Server IP Address: 192.168.0.2
Autoscroll
Clear output
9600 baud
Newline
- Copy the IP address mentioned above and paste it into the address bar of your web browser. You will see a simple webpage from the Arduino.
