DFR0342 W5500 Ethernet with POE Main board

W5500 Ethernet with POE IoT Board (Arduino Compatible)
The W5500 Ethernet with POE IOT Board is the newest member of the DFRobot Ethernet family. Based on the ATmega32u4 and W5500 Ethernet chip, this board offers the same footprint as an Arduino Leonardo board, as well as being compatible with most Arduino shields and sensors, making it well suitable for many kinds of IOT applications. Different from the previous W5200 shield, this W5500 mainboard highlights its performance with the POE power supply and WOL mode integrated on the board.Compliant with IEEE 802.3af standard and POE power supply agreement, the W5500 Ethernet mainboard for Arduino comes with onboard POE voltage-stablized circuit, external power voltage-stablized circuit, SD card circuit, and Leonardo unit-controlling circuit. The 4 layers wiring design and compact layout solved the previous space waste problem caused by the stackable design of Shield + Arduino. So, this board is small in size but with more powerful functions.What's more, to ensure the system reliability in power changing, we adopt more intelligent and professional PD power chip, which enables all the onboard systems to work properly under all sorts of complicated environments.
  • Microcontroller: Atmel Atmega32u4 (Arduino Leonardo)
  • External Input Voltage Range (recommended): 7V~23V DC
  • External Input Voltage Range (limit): <24V DC
  • POE Input Voltage: 48V AC/DC (802.3af standard compliant PD device)
  • Digital I/O Pins: 20
  • Analog I/O Pins: 6
  • DC Current per I/O Pin: 40mA
  • Flash Memory: 32KB (ATmega32u4) (4KB used by bootloader)
  • SRAM: 2KB (ATmega32u4)
  • EEPROM: 1KB (ATmega32u4)
  • Clock Speed: 16MHz
  • PHY: WIZnet W5500
  • PHY Clock Speed: 25MHz
  • Dimension: 73.5x53.5x15mm/2.89x2.11x0.59 inches
technical details
  • Home network equipment: set-top box, PVR, digital media center
  • Serial Ethernet: access control system, LED display, wireless AP relay, etc
  • Parallel Ethernet: POS or handheld printer, copier
  • USB Ethernet: storage device, network printer
  • Security system: webcam
  • Monitoring equipment
  • Embedded server
how to use




  1. Standard POE Protocol Ethernet Swtich X1
  2. W5500 Ethernet with POE Mainboard X1
  3. Micro USB cable X1
  4. RJ45 network cable X2

Step 1

Connect W5500 Reset pins: Connect A-RST pin to D11. (Default: Connected)


Step 2

Plug one end of the ethernet cable to W5500 mainboard, another end to any LAN ports of the Ethernet Switch, or you can use normal Internet switch or router device to directly connect to a PC’s network interface (the module needs to be powered up here).

Connection 1

Step 3

Connect the W5500 mainbord to a computer with a USB cable.

Connection 2

Step 4

Download the WIZnet official Arduino library here. Unpack the downloaded file and then, place the Ethernet file under Arduino IDE 1.0.x or Arduino IDE 1.5.x in the libraries file of Arduino IDE according to your Arduino IDE version (overlap the original Ethernet library). Open Arduino IDE editor, find WebServer example in File->Example->Ethernet and open it.

  1. Download the W5500 Ethernet library here
  2. Replace the existing Ethernet library according to your Arduino IDE version:

Arduino IDE 1.0.X Arduino IDE 1.5.X

NOTE: Good news! You can use arduino IDE v1.7 from Arduino.org that has “Ethernet 2” library, which works with this board. It means you don’t have to download any modded libraries. Thank for the Vladimir Akopyan comments. Welcome to share your projects and comments on the Disqus.

Step 5: Pin Definitions

Note: These parts should be declared at the beginning of the sketch.

1. Define W5500 SPI “SS” pin and “Reset” Pin:

#define SS     10U    //D10----- SS
#define RST    11U    //D11----- Reset

2. Setup function

void setup() {
pinMode(SS, OUTPUT);
pinMode(RST, OUTPUT);
digitalWrite(SS, LOW);
digitalWrite(RST,HIGH);  //Reset
delay(200);              //Wait W5500


Open Arduino IDE, Select Boards –>Arduino Leonardo and COM port

/*  Web Server

 A simple web server that shows the value of the analog input pins.
 using an Arduino Wiznet Ethernet shield.

 * Ethernet shield attached to pins 10, 11, 12, 13
 * Analog inputs attached to pins A0 through A5 (optional)

 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe

#include <SPI.h>
#include <Ethernet.h>
#define SS     10U    //D10 ---- SS
#define RST    11U    //D11 -----Reset

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:

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

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

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):

EthernetServer server(80);

void setup() {
  pinMode(SS, OUTPUT);
  pinMode(RST, OUTPUT);
  digitalWrite(SS, LOW);
  digitalWrite(RST, HIGH); //Reset
  digitalWrite(RST, LOW);
  digitalWrite(RST, HIGH);
  delay(200);              //Wait W5500
  //Open serial communications and wait for port to open :
  //while (!Serial) {
  //  ; // wait for serial port to connect. Needed for Leonardo only
  // start the Ethernet connection and the server:
  Ethernet.begin(mac, ip);
  //Serial.print("server is at ");

void loop() {
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    //Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // 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");

          // the connection will be closed after completion of the response
          client.println("Connection: close");
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println("<!DOCTYPE HTML>");
          // output the value of each analog input pin
          for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
            int sensorReading = analogRead(analogChannel);
            client.print("analog input ");
            client.print(" is ");
            client.println("<br />");
        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
    // close the connection:
    //Serial.println("client disconnected");

Check that it works

Open the Arduino Serial Monitor to initialize the setup and you will see some information about the connection processing. Open your browser, input the IP address and you should get see data of 5 virtual analog pins:


V2.0 Schematic


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