nRF24L01+ 2.4 GHz radio with ESP32

Supply 3.3 V Bus SPI

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
GND	Ground	GND
VCC	Power	3V3	3.3 V only. Add a 10 µF capacitor across VCC and GND
CE	Input (the ESP32 drives it)	D25	Chip enable
CSN	SPI chip select	D5	SPI chip select
SCK	SPI clock	D18
MOSI	SPI MOSI	D23
MISO	SPI MISO	D19
IRQ	Interrupt	D35	Interrupt, optional

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); }  // CE

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

Nordic nRF24L01+ product specification, SPI interface, CE and IRQ pins; supply 1.9 to 3.6 V

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