How to use nrf24l01 with esp32 s3 / c3

Projects Programming
1

Hi. I just got into microcontrollers and started working on my first project, an transmitter and receiver. I have two nrf24 modules, an esp32 s3 and an esp32 c3. But, unfortunately, nothing is working. This is the code for the transmitter (esp32 s3):

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
void begin(int8_t sck =12, int8_t miso =13, int8_t mosi =11, int8_t ss =10);
RF24 radio(10, 19); // CE, CSN

const byte address[6] = "00001";
void setup() {
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
}

void loop() {
  const char text[] = "Hello World";
  radio.write(&text, sizeof(text));
  delay(1000);
}

And this is the code for the receiver (esp32 c3) :

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
void begin(int8_t sck =4, int8_t miso =5, int8_t mosi =6, int8_t ss =7);
RF24 radio(7, 3); // CE, CSN

const byte address[6] = "00001";

void setup() {
  Serial.begin(9600);
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();
}

void loop() {
  if (radio.available()) {
    char text[32] = "";
    radio.read(&text, sizeof(text));
    Serial.println(text);
  }
}

It's probably a programming issue, but I cant seem to find it.

2

Welcome to the forum

The begin() function seems to be missing from your sketches as does a call to it

1 Like
3

Hi,

The begin() function is from the SPI library. The support team from where I bought the board recommended that I use this function. The esp32 s3 doesn't have dedicated pins for SPI, and I need a way to declare them.

4

The begin() function that you declare in the sketch has no definition and in any case is not the function called by wire.begin()

1 Like
5

And the way to address it is with;

SPI.begin();

There are default SPI pins set in the Arduino core for ESP32S3.

To start SPI on an ESP32S3 Dev kit board I can use;

SPI.begin();

1 Like
6

the SPI pins I used on a ESP32_S3_DevKit_1 are

// ESP32_S3_DevKit_1 connections
// ESP32_S3 SCK pin GPIO12  to NRF24L01_pin SCK
// ESP32_S3 MISO pin GPIO13  to NRF24L01_pin MISO
// ESP32_S3 MOSI pin GPIO11  to NRF24L01_pin MOSI
// ESP32_S3 SS  pin GPIO 10   to NRF24L01 SS
// ESP32_S3  pin GPIO 9   to NRF24L01 CSN

RF24 radio(10, 9); // CE, CSN pins

void setup()
 {
  Serial.begin(115200); 
  Serial.println("\n\nESP32 > NRF24L01 transmit test");
  radio.begin();
  if (radio.isChipConnected())
    Serial.println("Transmitter NF24 connected to SPI");
  else Serial.println("\n\nNF24 is NOT connected to SPI");
1 Like
7

Thank you so much! It's working now. I really appreciate your help. Props to all of you for helping me out!

8

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