NRF24L01

The NRF24L01 is a 2.4 GHz wireless transceiver module for short-range data communication between microcontrollers. It connects over SPI and typically uses CE, CSN, SCK, MOSI, MISO, IRQ, GND, and a 3.3 V supply.

Width: 31.1 mm

Pinout — NRF24L01

Pin	Signal	Description
`GND`	ground	Ground reference for the nRF24L01 module and SPI interface.
`CE`	enable	Chip enable control for RX/TX mode operation, driven by the MCU.
`CSN`	chip-select	Active-low SPI chip select for addressing the nRF24L01.
`SCK`	SCK	SPI clock input from the microcontroller.
`VCC`	power	3.3V power input for the nRF24L01 radio module; do not connect to 5V.
`MISO`	MISO	SPI data output from the nRF24L01 to the microcontroller.
`MOSI`	MOSI	SPI data input to the nRF24L01 from the microcontroller.
`IRQ`	interrupt	Active-low interrupt output for receive, transmit, or error events.

Example wiring diagram — NRF24L01

From	To	Wire
`board:3.3V`	`x1:VCC`	darkorange
`board:GND`	`x1:GND`	black
`board:D9`	`x1:CE`	green
`board:D10`	`x1:CSN`	blue
`board:D13`	`x1:SCK`	yellow
`board:D12`	`x1:MISO`	purple
`board:D11`	`x1:MOSI`	cyan

Example Arduino code — NRF24L01

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

#include <SPI.h>
#include <RF24.h>

// NRF24L01 wiring on Arduino Uno:
// CE  -> D9
// CSN -> D10
// SCK -> D13
// MISO-> D12
// MOSI-> D11
// VCC -> 3.3V
// GND -> GND

RF24 radio(9, 10); // CE, CSN
const byte address[6] = "1Node";

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    ;
  }

  Serial.println(F("NRF24L01 basic transmit example"));

  if (!radio.begin()) {
    Serial.println(F("Radio hardware not responding! Check wiring and 3.3V power."));
    while (1) {
      delay(1000);
    }
  }

  radio.setPALevel(RF24_PA_LOW);
  radio.setDataRate(RF24_1MBPS);
  radio.setChannel(76);
  radio.openWritingPipe(address);
  radio.stopListening();

  Serial.println(F("Radio initialized and ready to send messages."));
}

void loop() {
  const char message[] = "Hello NRF24L01";
  bool ok = radio.write(&message, sizeof(message));

  Serial.print(F("Sending: "));
  Serial.print(message);
  Serial.print(F(" -> "));
  Serial.println(ok ? F("success") : F("failed"));

  delay(1000);
}

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