ENC28J60 Ethernet module with ESP32

Supply 3.3 V Bus SPI

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
CLKOUT	Not wired to the ESP32	—	Clock output, not needed
INT	Interrupt	D35	Interrupt, optional
WOL	Not wired to the ESP32	—	Wake-on-LAN, not needed
SO	SPI MISO	D19
SI	SPI MOSI	D23
SCK	SPI clock	D18
CS	SPI chip select	D5	SPI chip select
RESET	Input (the ESP32 drives it)	D25	Reset, active LOW
VCC	Power	3V3	3.3 V. Draws up to about 180 mA while sending
GND	Ground	GND

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); }  // RESET

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

Microchip ENC28J60 datasheet, SPI interface (CS, SCK, SI, SO), INT, WOL, CLKOUT; supply 3.1 to 3.6 V; TX current about 180 mA
Common ENC28J60 module, 2x5 header; a 12-pin version also exists. Check the silkscreen

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