Nrf24l01 receiving random data

I have modified code from nRF24L01 Interfacing with Arduino | Wireless Communication - Arduino Project Hub. After uploading Serial monitor on the receiver is showing things like "B⸮!B⸮!B⸮!B⸮!B⸮!B⸮!B" and "⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮".

TRANSMITTER

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(9, 10); // CE, CSN
const byte address[6] = "00011";     //Byte of array representing the address. This is the address where we will send the data. This should be same on the receiving side.
void setup() {
  radio.begin();                  //Starting the Wireless communication
  radio.openWritingPipe(address); //Setting the address where we will send the data
  radio.setPALevel(RF24_PA_MIN);  //You can set it as minimum or maximum depending on the distance between the transmitter and receiver.
  radio.stopListening();          //This sets the module as transmitter
}
void loop() {
  const char text[] = "It Works!";
  radio.write(&text, sizeof(text));                  //Sending the message to receiver
  delay(1000);
}

RECEIVER

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
RF24 radio(9, 10); // CE, CSN
const byte address[6] = "00011";
void setup() {
  Serial.begin(9600);
  radio.begin();
  radio.openReadingPipe(0, address);   //Setting the address at which we will receive the data
  radio.setPALevel(RF24_PA_MIN);       //You can set this as minimum or maximum depending on the distance between the transmitter and receiver.
  radio.startListening();              //This sets the module as receiver
}
void loop() {
  if (radio.available())              //Looking for the data.
  {
    char text[32] = "";                 //Saving the incoming data
    radio.read(&text, sizeof(text));    //Reading the data
    if (text == "It Works!"){
      Serial.println(text);
    }
    Serial.println(text);
  //  Serial.println("radio available");
  }
  delay(5);
}

Thank you for any kind of help in advance

Modify the setup() by adding a test print to the serial monitor;

void setup() {
  Serial.begin(9600);
Serial.println("Program starting");

Do you see the starting message in the serial monitor ?

Yes, I can see it in there

Then first prove the modules are working, try the tutorial here;

Or the Getting Started example from the NRF24 library.

1 Like

I have coppied the tutorial code and now the receiver is printing "Data recieved ", but nothing else and transmitter is saying "Data Sent Message 0 Tx failed"

Does this really mean I have bought 6 not working modules ? :frowning:

Robin2's tutorial prints more than you claim, but you maybe just forgot to mention that.
A copy of the output would have been more useful.

Does the "Data received" message repeat very fast?
Then you have a bad wiring or a bad module.

If the printed message were "Data received Message 0"
it would point to an insufficient power supply of the NRF chip.

1 Like

The only thing I have not mentioned that is printed is "SimpleRx Starting" at the top.
Unfortunately, the "Data received" message is repeating extremely fast and I am quite sure that wiring is correct. So I guess I am going to buy new modules.

There is a connection test sketch in Robin2's tutorial, post the output of that.

Ok, so i found out 1 wire got disconnected. Now that I have chcecked Robin's connection and made sure it is correct, the output on the Serial monitor is this (picture). It prints "Data received!" nrf24l01|690x357, 75%
for around 1500 ms, then this (picture) happens, and then it stopps

Also, if i try to position the modules the output keeps printing stuff like this


and this

Check "show timestamp" and post a copy of the output, not a picture of it.

Check your transmitter with the connection test sketch too.

12:00:20.420 ->
12:00:20.420 -> DatSimpleRx Starting
12:00:21.900 -> Data received
12:00:21.948 -> Data received
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12:00:23.030 -> Data received ⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮
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12:00:24.021 -> Data received ⸮⸮pppp``` 12:00:24.021 -> Data received ⸮p````@@@@ 12:00:24.067 -> Data received ⸮@@@ 12:00:24.113 -> Data received ⸮⸮xpptpppx 12:00:24.158 -> Data received 12:00:24.250 -> Data received 12:00:24.250 -> Data received 12:00:24.297 -> Data received 12:00:24.297 -> Data received 12:00:24.342 -> Data received 12:00:24.342 -> Data received 12:00:24.390 -> Data received 12:00:24.390 -> Data received ⸮⸮⸮⸮⸮⸮⸮o⸮ 12:00:24.390 -> Data received 12:00:24.390 -> Data received 12:00:24.438 -> Data received 12:00:24.438 -> Data received 12:00:24.486 -> Data received 12:00:24.486 -> Data received 12:00:24.486 -> Data received 12:00:24.486 -> Data received 12:00:24.534 -> Data received ⸮ppp|@@ 12:00:24.582 -> Data received 12:00:24.582 -> Data received 12:00:24.582 -> Data received ⸮⸮`@@@@ 12:00:24.628 -> Data received 12:00:24.628 -> Data received ⸮⸮`@@ 12:00:24.674 -> Data received 12:00:24.674 -> Data received 12:00:24.719 -> Data received 12:00:24.719 -> Data received 12:00:24.719 -> Data received 12:00:24.719 -> Data received 12:00:24.767 -> Data received 12:00:24.767 -> Data received 12:00:24.815 -> Data received 12:00:24.815 -> Data received 12:00:24.815 -> Data received 12:00:24.815 -> Data received 12:00:24.863 -> Data received 12:00:24.863 -> Data received 12:00:24.911 -> Data received 12:00:24.911 -> Data received 12:00:24.959 -> Data received 12:00:24.959 -> Data received 12:00:24.959 -> Data received 12:00:24.959 -> Data received 12:00:25.005 -> Data received 12:00:25.005 -> Data received 12:00:25.051 -> Data received 12:00:25.051 -> Data received 12:00:25.051 -> Data received ⸮@@@@@@ 12:00:25.051 -> Data received 12:00:25.097 -> Data received ⸮ 12:00:25.097 -> Data received ⸮p@@@@@@
12:00:25.145 -> Data received ⸮⸮xp 12:00:25.191 -> Data received ⸮⸮p`````@@ 12:00:25.191 -> Data received ⸮````@@@@@ 12:00:25.239 -> Data received ⸮p``@`@@@@ 12:00:25.286 -> Data received ⸮`@@@@@@@@ 12:00:25.286 -> Data received 12:00:25.286 -> Data received ⸮pp``@@@`@ 12:00:25.333 -> Data received 12:00:25.381 -> Data received 12:00:25.381 -> Data received 12:00:25.381 -> Data received ⸮⸮`pp``p`@ 12:00:25.428 -> Data received 12:00:25.428 -> Data received 12:00:25.475 -> Data received 12:00:25.475 -> Data received ⸮⸮⸮⸮⸮⸮⸮⸮` 12:00:25.521 -> Data received 12:00:25.521 -> Data received 12:00:25.521 -> Data received 12:00:25.567 -> Data received 12:00:25.567 -> Data received ⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮ 12:00:25.613 -> Data received 12:00:25.613 -> Data received ⸮pp```@``` 12:00:25.613 -> Data received ⸮|`p````@` 12:00:25.659 -> Data received ⸮⸮⸮⸮|pp`pp 12:00:25.705 -> Data received ⸮p````@``@ 12:00:25.752 -> Data received ⸮```````@@ 12:00:25.752 -> Data received ⸮```@@@@@@ 12:00:25.800 -> Data received ⸮~```````` 12:00:25.848 -> Data received ⸮x```````@ 12:00:25.848 -> Data received ⸮⸮ppp````p 12:00:25.896 -> Data received ⸮⸮p`p````` 12:00:25.943 -> Data received ⸮x```@@`@@ 12:00:25.943 -> Data received ⸮⸮xp
12:00:25.991 -> Data received ⸮~xp``````
12:00:25.991 -> Data received ⸮⸮~xpxxp 12:00:26.038 -> Data received ⸮|@@@` 12:00:26.084 -> Data received ⸮⸮````@`@` 12:00:26.084 -> Data received ⸮⸮xppp 12:00:26.130 -> Data received ⸮p```````@ 12:00:26.176 -> Data received ⸮`@@@@ 12:00:26.222 -> Data received 12:00:26.222 -> Data received ⸮p@@@`` 12:00:26.222 -> Data received ⸮p````@``@ 12:00:26.269 -> Data received ⸮p``@@@@@
12:00:26.316 -> Data received ⸮⸮@````` 12:00:26.316 -> Data received ⸮@@@@@@ 12:00:26.316 -> Data received 12:00:26.362 -> Data received 12:00:26.362 -> Data received 12:00:26.408 -> Data received 12:00:26.408 -> Data received 12:00:26.455 -> Data received 12:00:26.455 -> Data received 12:00:26.455 -> Data received 12:00:26.455 -> Data received 12:00:26.500 -> Data received 12:00:26.500 -> Data received 12:00:26.546 -> Data received 12:00:26.546 -> Data received 12:00:26.546 -> Data received 12:00:26.546 -> Data received 12:00:26.593 -> Data received 12:00:26.593 -> Data received 12:00:26.640 -> Data received 12:00:26.640 -> Data received 12:00:26.687 -> Data received 12:00:26.687 -> Data received _ 12:00:26.970 -> Data received ???? 12:00:26.970 -> Data received aaa 12:00:27.018 -> Data received 12:00:27.018 -> Data received 12:00:27.018 -> Data received 12:00:27.064 -> Data received 12:00:27.064 -> Data received 12:00:27.110 -> Data received 12:00:27.110 -> Data received 12:00:27.110 -> Data received 12:00:27.110 -> Data received 12:00:27.157 -> Data received 12:00:27.157 -> Data received ⸮ 12:00:27.203 -> Data received ⸮@@ 12:00:27.203 -> Data received ⸮@ 12:00:27.249 -> Data received ⸮@ 12:00:27.249 -> Data received 12:00:27.249 -> Data received 12:00:27.296 -> Data received 12:00:27.296 -> Data received 12:00:27.344 -> Data received ⸮@ 12:00:27.344 -> Data received ⸮ 12:00:27.344 -> Data received ⸮@ 12:00:27.344 -> Data received ⸮@@@ 12:00:27.391 -> Data received ⸮@ 12:00:27.391 -> Data received ⸮@ 12:00:27.439 -> Data received 12:00:27.439 -> Data received 12:00:27.486 -> Data received 12:00:27.486 -> Data received 12:00:27.486 -> Data received ⸮ 12:00:27.531 -> Data received ⸮@ 12:00:27.531 -> Data received ⸮@ 12:00:27.579 -> Data received ⸮ 12:00:27.579 -> Data received 12:00:27.579 -> Data received 12:00:27.579 -> Data received 12:00:27.627 -> Data received 12:00:27.627 -> Data received ⸮@ 12:00:27.674 -> Data received ⸮`@@ 12:00:27.674 -> Data received ⸮`@@ 12:00:27.674 -> Data received ⸮⸮p~pp@
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I have been trying to position modules during this

Also, how do I check my transmitter with the connection test sketch?

Your receiver looks bad connected or dysfunctional.
You really checked it with the connection test sketch?
Please post the output of that.

Use code tags for data like you would for code.

I'm not sure I know how to make the connection test sketch. Do you want me to read whether pins are HIGH or LOW?

As per the description for the connection test;

"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."

So nothing to do with RF transmit or receive.

I'm don't really now what to do, so here is the transmitter output

12:16:36.311 -> SimpleTx Starting
12:16:37.430 -> Data Sent Message 0 Tx failed
12:16:38.539 -> Data Sent Message 0 Tx failed
12:16:39.610 -> Data Sent Message 0 Tx failed
12:16:40.725 -> Data Sent Message 0 Tx failed
12:16:41.837 -> Data Sent Message 0 Tx failed
12:16:42.906 -> Data Sent Message 0 Tx failed
12:16:44.021 -> Data Sent Message 0 Tx failed
12:16:45.088 -> Data Sent Message 0 Tx failed
12:16:46.202 -> Data Sent Message 0 Tx failed
12:16:47.272 -> Data Sent Message 0 Tx failed
12:16:48.386 -> Data Sent Message 0 Tx failed
12:16:49.458 -> Data Sent Message 0 Tx failed
12:16:50.584 -> Data Sent Message 0 Tx failed
12:16:51.654 -> Data Sent Message 0 Tx failed
12:16:52.772 -> Data Sent Message 0 Tx failed
12:16:53.841 -> Data Sent Message 0 Tx failed
12:16:54.963 -> Data Sent Message 0 Tx failed

Ok, you were right, the connections were not correct. I think I have fixed it, but now the receiver is stuck on "12:31:06.563 -> SimpleRx Starting"

From which "tutorial" did you get this ?

It is modified code from nRF24L01 Interfacing with Arduino | Wireless Communication - Arduino Project Hub

OK. But you can't use the equality operator "==" with an entire character array. You must use strcmp() or similar.