W5500 Ethernet

// W5500 Ethernet on Arduino Uno: wiring and a free simulation at https://www.tinkered.ai/components/w5500-ethernet
// W5500 module on an Arduino Uno: CS D10, SPI D11/D12/D13. Gets an address by DHCP, then fetches a page.
#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x01 }; // any unique locally administered MAC
EthernetClient client;

void setup() {
  Serial.begin(115200);
  Ethernet.init(10); // CS pin
  Serial.println(F("Requesting an address by DHCP..."));
  if (Ethernet.begin(mac) == 0) {
    if (Ethernet.hardwareStatus() == EthernetNoHardware) Serial.println(F("W5500 not found: check wiring"));
    else if (Ethernet.linkStatus() == LinkOFF) Serial.println(F("No link: check the cable"));
    else Serial.println(F("DHCP failed"));
    while (true) {}
  }
  Serial.print(F("IP address: "));
  Serial.println(Ethernet.localIP());
  if (client.connect("example.com", 80)) {
    client.println(F("GET / HTTP/1.1"));
    client.println(F("Host: example.com"));
    client.println(F("Connection: close"));
    client.println();
  } else {
    Serial.println(F("Connection failed"));
  }
}

void loop() {
  while (client.available()) Serial.write(client.read());
  if (!client.connected() && client) {
    client.stop();
    Serial.println(F("\nDone"));
  }
  Ethernet.maintain(); // renews the DHCP lease
}

// W5500 Ethernet on ESP32 DevKit V1: wiring and a free simulation at https://www.tinkered.ai/components/w5500-ethernet
// W5500 module on an ESP32 DevKit V1: CS GPIO5, VSPI 18/19/23. Gets an address by DHCP, then fetches a page.
#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x02 };
EthernetClient client;

void setup() {
  Serial.begin(115200);
  SPI.begin(18, 19, 23, 5); // SCK, MISO, MOSI, SS
  Ethernet.init(5);
  Serial.println("Requesting an address by DHCP...");
  if (Ethernet.begin(mac) == 0) {
    if (Ethernet.hardwareStatus() == EthernetNoHardware) Serial.println("W5500 not found: check wiring");
    else if (Ethernet.linkStatus() == LinkOFF) Serial.println("No link: check the cable");
    else Serial.println("DHCP failed");
    while (true) { delay(100); }
  }
  Serial.print("IP address: ");
  Serial.println(Ethernet.localIP());
  if (client.connect("example.com", 80)) {
    client.println("GET / HTTP/1.1");
    client.println("Host: example.com");
    client.println("Connection: close");
    client.println();
  } else {
    Serial.println("Connection failed");
  }
}

void loop() {
  while (client.available()) Serial.write(client.read());
  if (!client.connected() && client) {
    client.stop();
    Serial.println("\nDone");
  }
  Ethernet.maintain();
}

// W5500 Ethernet on Raspberry Pi Pico: wiring and a free simulation at https://www.tinkered.ai/components/w5500-ethernet
// W5500 module on a Raspberry Pi Pico (arduino-pico): CS GP17, SPI0 GP16/18/19. Gets an address by DHCP, then fetches a page.
#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x03 };
EthernetClient client;

void setup() {
  Serial.begin(115200);
  SPI.setRX(16);
  SPI.setSCK(18);
  SPI.setTX(19);
  Ethernet.init(17);
  Serial.println("Requesting an address by DHCP...");
  if (Ethernet.begin(mac) == 0) {
    if (Ethernet.hardwareStatus() == EthernetNoHardware) Serial.println("W5500 not found: check wiring");
    else if (Ethernet.linkStatus() == LinkOFF) Serial.println("No link: check the cable");
    else Serial.println("DHCP failed");
    while (true) { delay(100); }
  }
  Serial.print("IP address: ");
  Serial.println(Ethernet.localIP());
  if (client.connect("example.com", 80)) {
    client.println("GET / HTTP/1.1");
    client.println("Host: example.com");
    client.println("Connection: close");
    client.println();
  } else {
    Serial.println("Connection failed");
  }
}

void loop() {
  while (client.available()) Serial.write(client.read());
  if (!client.connected() && client) {
    client.stop();
    Serial.println("\nDone");
  }
  Ethernet.maintain();
}