WIZ Ethernet Library for Arduino IDE 1.5.7


The Ethernet library lets you connect to the Internet or a local network.

Supported devices

  • ioShield, WIZ550io (used in W5500)
  • W5200 Ethernet Shield, WIZ820io (used in W5200)
  • Ethernet Shield (used in W5100)



Install WIZ Ethernet library

Download all files and overwrite onto the”Arduino\libraries\Ethernet” folder in your project in sketch.
– Ethernet folder has two folers, examples and src folers.

Select device(shield)

Uncomment device(shiel) you want to use.

#ifndef W5100_H_INCLUDED
#define W5100_H_INCLUDED

#include <avr/pgmspace.h>

typedef uint8_t SOCKET;
//#define W5100_ETHERNET_SHIELD
//#define W5200_ETHERNET_SHIELD

Using the WIZ Ethernet library and evaluate existing Ethernet example.

All other steps are the same as the steps from the Arduino Ethernet Shield.
You can use examples in ./Ethernet/examples folder for the Arduino IDE 1.5.7, go to Files->Examples->Ethernet, open any example, then copy it to your sketch file and change configuration values properly.
After that, you can check if it is work well. For example, if you choose ‘WebServer’, you should change IP Address first and compile and download it. Then you can access web server page through your web browser of your PC or something.

Revision History

Initial Release : 15 Jul. 2014

Internet Radio (WIZ550io)


Go to post (in Japanese)

We will introduce the “Internet radio” produced by using the WIZ550io (built-in MAC address) and ATMEGA1284P (Flash128K, EEPROM4K). User can register maximum 80 radio broadcastings. The radio broadcasting registration can be done by the built-in Web page.

The Hardware configuration of “Internet Radio” is as follows,

  • MP3 codec : VS1053b module (3.3V, 74HC4050AP level shift)
  • Ethernet : WIZ550io module
  • Display : 16X2 LCD module

The following Ethernet protocol has been applied in Sketch (arduino-IDE 1.0.5) .

  • DHCP Client
  • HTTP Server ( Web-based broadcast registration )



  • Web Server & LED Blink

A simple web server that shows and control the value of the LED Digital using an Arduino Wiznet Ethernet shield. This sketch for GR-KURUMI is merged Web-server and LED Blink. You can do controlling and monitoring the RGB LED on GR KURUMI Board via Internet or Local Network.
After opening a web-browser and navigating to the Ethernet shield’s IP address, the GR-KURUMI will respond with just enough HTML for a browser to display the data. A RGB LED on GR-KURUMI is also controlled by the request of web-browser.

  • Circuit
  • Ethernet shield attached to pins 10, 11, 12, 13
  • Pin 22,23,24 has an LED connected on most Arduino boards.
  • Pin22: LED_RED
  • Pin23: LED_GREEN
  • Pin24: LED_BULE
  • SW
  • Code
  • Configuration of IP address

    IPAddress ip(192,168,1,177);

  • Initalize the Port (port80 is default for HTTP)

    EthernetServer server(80);

  • Parsing of HTTP GET Message

When web-page address is to on the Green LEN,
the received HTTP GET Message is as below,

GET /G0 HTTP/1.1
Accept: text/html, application/xhtml+xml,....

So, 5th~7th data are parsed to control RGB LEDs.

//5th~7th data of HTTP GET Message is parsed as parse_arr
parse_arr[0] = '/'
parse_arr[1] = 'G'
parse_arr[2] = '0'