Simple nRF24L01+ 2.4GHz transceiver demo

Community Exhibition / Gallery
30

There have been several Threads in which people have reported problems with the SimpleRX program repeatedly printing Data Received very quickly even though it is obvious that data is not being received. When the communication is working properly messages should only be printed once per second.

As far as I can see the problem is caused by a poor connection between the Arduino and the nRF24 module. I can reproduce the symptom by disconnecting the CSN_PIN connection.

The following program may help to diagnose this sort of problem as it just tests the connection between the Arduino and its nRF24 without attempting to send or receive any data to / from another nRF24.

I hope the messages in the program are self-explanatory

CheckConnection.ino

// 18 Mar 2018 - simple program to verify connection between Arduino
//      and nRF24L01+
//  This program does NOT attempt any communication with another nRF24

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

#include <printf.h>

#define CE_PIN   9
#define CSN_PIN 10

const byte thisSlaveAddress[5] = {'R','x','A','A','A'};

RF24 radio(CE_PIN, CSN_PIN);

char dataReceived[10]; // this must match dataToSend in the TX
bool newData = false;


void setup() {
    Serial.begin(9600);
    printf_begin();

    Serial.println("CheckConnection Starting");
    Serial.println();
    Serial.println("FIRST WITH THE DEFAULT ADDRESSES after power on");
    Serial.println("  Note that RF24 does NOT reset when Arduino resets - only when power is removed");
    Serial.println("  If the numbers are mostly 0x00 or 0xff it means that the Arduino is not");
    Serial.println("     communicating with the nRF24");
    Serial.println();
    radio.begin();
    radio.printDetails();
    Serial.println();
    Serial.println();
    Serial.println("AND NOW WITH ADDRESS AAAxR  0x41 41 41 78 52   ON P1");
    Serial.println(" and 250KBPS data rate");
    Serial.println();
    radio.openReadingPipe(1, thisSlaveAddress);
    radio.setDataRate( RF24_250KBPS );
    radio.printDetails();
    Serial.println();
    Serial.println();
}


void loop() {

}

...R

1 Like