Arduino nano and W5100 thernet shield problem


I just bought an W5100 arduino nano shield, and I don’t achieve to use it

This one : NANO W5100 Ethernet Shield Network Expansion Board for Arduino Nano V3.0 | eBay

I tried with 2 different arduino and shield, same way.

Power led is ON, but no communication with ethernet.

I tried different ethernet exemples, it says no hardware.

Web client

This sketch connects to a website (
using an Arduino Wiznet Ethernet shield.


  • 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 = “”; // 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:
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 ");
// give the Ethernet shield a second to initialize:
Serial.print(“connecting to “);

// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.print("connected to ");
// Make a HTTP request:
client.println(“GET /search?q=arduino HTTP/1.1”);
client.println(“Connection: close”);
} 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;, 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.print(“Received “);
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(” kbytes/second”);

// do nothing forevermore:
while (true) {

Initialize Ethernet with DHCP:
Failed to configure Ethernet using DHCP
Ethernet shield was not found. Sorry, can’t run without hardware. :frowning:

Thanks for your help

The “shield” has a socket for power supply. Do you power it there or do you power the Nano? Post a link to the schematics of that “shield”, without schematics you might have to reverse engineer the “shield” first before you’re able to use it.

if you inserted SD card, remove it or initialize.


thanks for your help

I powered the shield directly via 9V, and it powers the nano

I don't have any SD card

The power led on shield is on.

Edit : it's exactly Deek-Robot Upgrade NANO W5100 Ethernet Shield for Arduino Nano

any help ? :slight_smile:


I have 0.8A with 8V in for both eth card and nano, only 0.15 for nano.

I have also 4.9V on D10 pin

but still not working :frowning:


next I would try older version of the Ethernet library. the last 1.x

I tried with older library, it works like a charm with a big w5100 shield connected to the arduino.

I tried with the nano shield and nothing.

edit it works :slight_smile: with DHCPchatserver exemple

thanks !

now, what works and what doesn't?

It works with nano W5100 shield and older library ! :slight_smile:

thanks a lot