---
title: "W5100S-EVB-Pico - ethernet shield not found"
url: "https://maker.wiznet.io/forum/15785"
markdown_url: "https://maker.wiznet.io/forum/15785/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "wiznetuser"
created: "2025-07-03T04:59:26+09:00"
last_activity: "2025-07-03T10:33:46+09:00"
language: "en"
views: 5
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W5100S-EVB-Pico - ethernet shield not found

## Question

Asked by wiznetuser on 2025-07-03 in Ethernet Chips.

I'm trying to run this code on my W5100S-EVB-Pico:

```c
#include <Arduino.h>
#include <SPI.h>
#include <Ethernet.h>

byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 10, 202);
EthernetServer server(80);

const int ledPin = 25; // Onboard LED for Pico

void blinkLED(int times, int delayMs) {
  //delayMs *= 50;

  for (int i = 0; i < times; i++) {
    digitalWrite(ledPin, HIGH);
    delay(delayMs);
    digitalWrite(ledPin, LOW);
    delay(delayMs);
  }
}

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(115200);
  while (!Serial) { ; }
  
  Serial.println("Setup start");
  digitalWrite(ledPin, HIGH);

  Ethernet.init(17);  // WIZnet W5100S-EVB-Pico W5500-EVB-Pico
  Serial.println("Ethernet initialized");

  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found. Stopping.");
    blinkLED(10, 100);
    while (true) delay(1);
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
    blinkLED(5, 300);
  }

  Ethernet.begin(mac, ip);
  server.begin();

  Serial.print("Server is at ");
  Serial.println(Ethernet.localIP());

  digitalWrite(ledPin, LOW);
  Serial.println("Setup done");
}

void loop() {
  EthernetClient client = server.available();

  if (client) {
    Serial.println("New client connected");
    blinkLED(2, 100);

    bool currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);

        if (c == ''\n'' && currentLineIsBlank) {
          Serial.println("\nSending response...");
          blinkLED(3, 50);

          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");
          client.println("Refresh: 5");
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
            int sensorReading = analogRead(analogChannel);
            client.print("analog input ");
            client.print(analogChannel);
            client.print(" is ");
            client.print(sensorReading);
            client.println("<br />");
          }
          client.println("</html>");
          break;
        }
        if (c == ''\n'') {
          currentLineIsBlank = true;
        } else if (c != ''\r'') {
          currentLineIsBlank = false;
        }
      }
    }
    delay(1);
    client.stop();
    Serial.println("Client disconnected");
    blinkLED(1, 200);
  }
}
```

It fails with: `Ethernet shield was not found. Stopping.`

I've tried with two different devices, both with Arduino IDE and Visual Code Studio. The devices has a proper ethernet link (based on the LEDs). What is wrong here?

## Replies

### Reply 1 by Aimee0, 2025-07-03

Hello, Please refer to the example at the following link.

<https://github.com/wiznetmaker/W5100S-EVB-Pico_Basic_Example_with_Arduino_IDE/tree/main>

---

Source: https://maker.wiznet.io/forum/15785