W5500 Ethernet module with ESP32

Supply 3.3 V Bus SPI

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
3V3	Power	3V3
5V	Not wired to the ESP32	—	Alternative 5 V input. Use either 3V3 or 5V, not both
GND	Ground	GND
RST	Input (the ESP32 drives it)	D25	Reset, active LOW
INT	Interrupt	D35
MOSI	SPI MOSI	D23
MISO	SPI MISO	D19
SCLK	SPI clock	D18
SCS	SPI chip select	D5	SPI chip select
NC	Not wired to the ESP32	—	Not connected

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

void setup() { pinMode(25, OUTPUT); }  // RST

void loop() {
  digitalWrite(25, HIGH);
  delay(500);
  digitalWrite(25, LOW);
  delay(500);
}

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.