nRF24L01 receiving gibberish data

Projects General Guidance
1

Hi. so I was trying to make 2 nRF24L01 modules to send data. One was the transmitter (let's take it as a) and the other was the receiver (as b). So i wrote a simple code to send "Hello World" from a to b and print it in the serial monitor, but the receiver was sending gibberish even if the transmitter was turned off. Transmitter's code:

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

RF24 radio(8, 7);
const byte address[6] = "Ju39x";

void setup() {
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_HIGH);
  radio.stopListening();
  Serial.begin(9600);
}

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

Receiver's code:

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

RF24 radio(8, 7);
const byte address[6] = "Ju39x";
void setup() {
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.setPALevel(RF24_PA_HIGH);
  Serial.begin(9600);
  radio.startListening();
}

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

How do I fix this?

2

As you've not indicated otherwise, you could start with the excellent tutorials here:

Start with the connection check sketch further on in the thread (post #30) before trying the simple tx rx sketches to check that your radios are working correctly.

3

Connect the receiver properly.

If it is not connected, 0xFF is very often received instead of real data.
Since packetAvailable is a bit that gets set in a control register,
you will see phantom packets with junk content.

4

I tried that sketch, but it is showing 0x00 and 0xff in all the fields

5

here is the serial monitor:


FIRST WITH THE DEFAULT ADDRESSES after power on
  Note that RF24 does NOT reset when Arduino resets - only when power is removed
  If the numbers are mostly 0x00 or 0xff it means that the Arduino is not
     communicating with the nRF24

STATUS		 = 0x00 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=0 TX_FULL=0
RX_ADDR_P0-1	 = 0x0000000000 0x0000000000
RX_ADDR_P2-5	 = 0x00 0x00 0x00 0x00
TX_ADDR		 = 0x0000000000
RX_PW_P0-6	 = 0x00 0x00 0x00 0x00 0x00 0x00
EN_AA		 = 0xff
EN_RXADDR	 = 0x00
RF_CH		 = 0x00
RF_SETUP	 = 0x00
CONFIG		 = 0x00
DYNPD/FEATURE	 = 0x00 0x00
Data Rate	 = 1MBPS
Model		 = nRF24L01
CRC Length	 = 8 bits
PA Power	 = PA_MIN


AND NOW WITH ADDRESS AAAxR  0x41 41 41 78 52   ON P1
 and 250KBPS data rate

STATUS		 = 0x00 RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=0 TX_FULL=0
RX_ADDR_P0-1	 = 0x0000000000 0x0000000000
RX_ADDR_P2-5	 = 0x00 0x00 0x00 0x00
TX_ADDR		 = 0x0000000000
RX_PW_P0-6	 = 0x00 0x00 0x00 0x00 0x00 0x00
EN_AA		 = 0xff
EN_RXADDR	 = 0x00
RF_CH		 = 0x00
RF_SETUP	 = 0x00
CONFIG		 = 0x00
DYNPD/FEATURE	 = 0x00 0x00
Data Rate	 = 1MBPS
Model		 = nRF24L01
CRC Length	 = 8 bits
PA Power	 = PA_MIN

the second module seems to be working, serial monitor of the second module:

CheckConnection Starting

FIRST WITH THE DEFAULT ADDRESSES after power on
  Note that RF24 does NOT reset when Arduino resets - only when power is removed
  If the numbers are mostly 0x00 or 0xff it means that the Arduino is not
     communicating with the nRF24

STATUS		 = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
RX_ADDR_P0-1	 = 0xe7e7e7e7e7 0x4141417852
RX_ADDR_P2-5	 = 0xc3 0xc4 0xc5 0xc6
TX_ADDR		 = 0xe7e7e7e7e7
RX_PW_P0-6	 = 0x00 0x20 0x00 0x00 0x00 0x00
EN_AA		 = 0x3f
EN_RXADDR	 = 0x03
RF_CH		 = 0x4c
RF_SETUP	 = 0x07
CONFIG		 = 0x0e
DYNPD/FEATURE	 = 0x00 0x00
Data Rate	 = 1MBPS
Model		 = nRF24L01+
CRC Length	 = 16 bits
PA Power	 = PA_MAX


AND NOW WITH ADDRESS AAAxR  0x41 41 41 78 52   ON P1
 and 250KBPS data rate

STATUS		 = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
RX_ADDR_P0-1	 = 0xe7e7e7e7e7 0x4141417852
RX_ADDR_P2-5	 = 0xc3 0xc4 0xc5 0xc6
TX_ADDR		 = 0xe7e7e7e7e7
RX_PW_P0-6	 = 0x00 0x20 0x00 0x00 0x00 0x00
EN_AA		 = 0x3f
EN_RXADDR	 = 0x03
RF_CH		 = 0x4c
RF_SETUP	 = 0x27
CONFIG		 = 0x0e
DYNPD/FEATURE	 = 0x00 0x00
Data Rate	 = 250KBPS
Model		 = nRF24L01+
CRC Length	 = 16 bits
PA Power	 = PA_MAX
6

Now would be a good time to tell us what hardware you are using, and how you have connected the radio modules.

7

ah i am sorry about that. i am using 2 arduino unos and 2 nrf24l01 modules

image
image1600×738 80.8 KB

8

ok so i switched the positions of CE and CSN and it is now working

9

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