Question about nrf24l01+pa+lna board with Mega 2560(RX) and UNO(TX))

Projects Networking, Protocols, and Devices
1

I am trying to use nrf24l01+pa+lna with Mega2560 and UNO to achieve wireless outgoing.
And I use a buck board to be the power supply to nrf24l01+pa+lna(Just TX).

Uno is transmitter

P_20220712_110638
P_20220712_1106381920×1080 187 KB

Mega2560 is receiver

P_20220712_110525
P_20220712_1105251920×1080 219 KB

And this is my code:

//Transmitter
#include <SPI.h>
#include <RF24.h>
#include <RF24_config.h>
#include <nRF24L01.h>
#include <printf.h>



RF24 rf24(7, 8); 

const uint8_t addr[6]= {'R','x','A','A','A'};
void setup() {
  Serial.begin(9600);
  rf24.begin();
  rf24.setPayloadSize(5);
  rf24.setChannel(80);  
  rf24.openWritingPipe(addr);     
  rf24.setPALevel(RF24_PA_LOW);
  rf24.setDataRate(RF24_250KBPS);
  rf24.setRetries(3,5);
  rf24.stopListening();       
  
}

void loop() {
  char data[5]="RF24";
  rf24.write(&data, sizeof(data));  
  delay(500);
}

//receiver

#include <SPI.h>
#include <RF24.h>
#include <RF24_config.h>
#include <nRF24L01.h>
#include <printf.h>


RF24 rf24(7, 8); 

const byte addr[6]= {'R','x','A','A','A'};
 

void setup() {
  Serial.begin(9600);
  printf_begin();
  rf24.begin();
  rf24.setPayloadSize(5);
  rf24.setChannel(80);
  rf24.openReadingPipe(0, addr);
  rf24.setPALevel(RF24_PA_LOW);
  rf24.setDataRate(RF24_250KBPS);
  rf24.startListening();
  rf24.printDetails();
}

void loop() {
  if (rf24.available()) {
    char data[5]="";
    rf24.read(&data, sizeof(data));
    Serial.println(data);
  }
 else{
    Serial.println("NO connect");

  }
  delay(500);
}

Problem
But my serial keep print nothing.... like:

11:13:40.645 ->      
11:13:40.645 -> 
11:13:45.146 -> 
same thing below...

Even when I plug out Uno's power it still print like:

11:13:40.645 ->      
11:13:40.645 -> 
11:13:45.146 -> 
same thing below.....
2

You've not indicated that you've tried any other sketches. Your best chances of getting your particular code to work, is to start with the tutorials that are provided here:

Read the first post and the jump to post #30 to run the connection check sketch on your UNO.

You should also run the same sketch on your 2560, but using the appropriate SPI pins. Away from my bench so I don't have the pins to hand.

Post the serial output from the tests here so we can confirm that the modules are wired correctly.

1 Like
4

I upload the connection check sketch:

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

#include <printf.h>

#define CE_PIN   7
#define CSN_PIN  8

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() {

}

And it print:
Mega2560:

// Mega2560
14:58:30.855 -> STATUS = 0x02 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=1 TX_FULL=0
14:58:30.921 -> RX_ADDR_P0-1 = 0x0202020202 0x0202020202
14:58:30.954 -> RX_ADDR_P2-5 = 0x02 0x02 0x02 0x02
14:58:30.986 -> TX_ADDR = 0x0202020202
14:58:31.019 -> RX_PW_P0-6 = 0x02 0x02 0x02 0x02 0x02 0x02
14:58:31.052 -> EN_AA = 0x02
14:58:31.085 -> EN_RXADDR = 0x02
14:58:31.085 -> RF_CH = 0x02
14:58:31.117 -> RF_SETUP = 0x02
14:58:31.117 -> CONFIG = 0x02
14:58:31.150 -> DYNPD/FEATURE = 0x02 0x02
14:58:31.260 -> Data Rate = 1 MBPS
14:58:31.260 -> Model = nRF24L01+
14:58:31.316 -> CRC Length = 8 bits
14:58:31.320 -> PA Power = PA_LOW
14:58:31.320 -> ARC = 2
14:58:31.325 ->14:58:31.325 ->
14:58:31.325 -> AND NOW WITH ADDRESS AAAxR 0x41 41 41 78 52 ON P1
14:58:31.361 -> and 250KBPS data rate
14:58:31.366 ->
14:58:31.366 -> SPI Speedz = 10 Mhz
14:58:31.381 -> STATUS = 0x02 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=1 TX_FULL=0
14:58:31.445 -> RX_ADDR_P0-1 = 0x0202020202 0x0202020202
14:58:31.478 -> RX_ADDR_P2-5 = 0x02 0x02 0x02 0x02
14:58:31.511 -> TX_ADDR = 0x0202020202
14:58:31.543 -> RX_PW_P0-6 = 0x02 0x02 0x02 0x02 0x02 0x02
14:58:31.577 -> EN_AA = 0x02
14:58:31.609 -> EN_RXADDR = 0x02
14:58:31.642 -> RF_CH = 0x02
14:58:31.642 -> RF_SETUP = 0x02
14:58:31.674 -> CONFIG = 0x02
14:58:31.674 -> DYNPD/FEATURE = 0x02 0x02
14:58:31.707 -> Data Rate = 1 MBPS
14:58:31.741 -> Model = nRF24L01+
14:58:31.741 -> CRC Length = 8 bits
14:58:31.773 -> PA Power = PA_LOW
14:58:31.773 -> ARC = 2

Uno :

15:36:36.262 -> CheckConnection Starting
15:36:37.861 ->
15:36:37.861 -> FIRST WITH THE DEFAULT ADDRESSES after power on
15:36:37.945 -> Note that RF24 does NOT reset when Arduino resets - only when power is removed
15:36:38.010 -> If the numbers are mostly 0x00 or 0xff it means that the Arduino is not
15:36:38.109 -> communicating with the nRF24
15:36:38.143 ->
15:36:38.143 -> SPI Speedz = 10 Mhz
15:36:38.176 -> STATUS = 0x00 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=0 TX_FULL=0
15:36:38.242 -> RX_ADDR_P0-1 = 0x20206060e0 0x00000000c0
15:36:38.276 -> RX_ADDR_P2-5 = 0xe0 0xc0 0xc0 0x80
15:36:38.310 -> TX_ADDR = 0x0000000000
15:36:38.343 -> RX_PW_P0-6 = 0x10 0x00 0x00 0x70 0x00 0x70
15:36:38.399 -> EN_AA = 0xc0
15:36:38.415 -> EN_RXADDR = 0x80
15:36:38.415 -> RF_CH = 0x80
15:36:38.443 -> RF_SETUP = 0x00
15:36:38.443 -> CONFIG = 0x80
15:36:38.477 -> DYNPD/FEATURE = 0x00 0x00
15:36:38.477 -> Data Rate = 1 MBPS
15:36:38.510 -> Model = nRF24L01+
15:36:38.543 -> CRC Length = 8 bits
15:36:38.543 -> PA Power = PA_MIN
15:36:38.577 -> ARC = 0
15:36:38.577 ->
15:36:38.577 ->
15:36:38.577 -> AND NOW WITH ADDRESS AAAxR 0x41 41 41 78 52 ON P1
15:36:38.644 -> and 250KBPS data rate
15:36:38.677 ->
15:36:38.677 -> SPI Speedz = 10 Mhz
15:36:38.710 -> STATUS = 0x00 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=0 TX_FULL=0
15:36:38.744 -> RX_ADDR_P0-1 = 0x20202020e0 0x00000000c0
15:36:38.811 -> RX_ADDR_P2-5 = 0xe0 0xc0 0xc0 0x80
15:36:38.844 -> TX_ADDR = 0x0000000070
15:36:38.878 -> RX_PW_P0-6 = 0x10 0x00 0x00 0x70 0x00 0x70
15:36:38.911 -> EN_AA = 0xc0
15:36:38.944 -> EN_RXADDR = 0xc0
15:36:38.944 -> RF_CH = 0x80
15:36:38.978 -> RF_SETUP = 0x00
15:36:38.978 -> CONFIG = 0xe0
15:36:39.011 -> DYNPD/FEATURE = 0x00 0x00
15:36:39.011 -> Data Rate = 1 MBPS
15:36:39.044 -> Model = nRF24L01+
15:36:39.087 -> CRC Length = 8 bits
15:36:39.087 -> PA Power = PA_MIN
15:36:39.087 -> ARC = 0
15:36:39.087 ->

Here are the question, why data rate changed to 1 MBPS, I set it at 250KBPS?

5

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