Getting error message on code from a tutorial

Projects Programming
1

Hi,

I'm trying to use me NRF24, but couldn't get them to work so I watched a tutorial on the internet
( https://www.electroniclinic.com/nrf24l01-with-arduino-nrf24l01-pinout-and-example-codes/#NRF24L01_Hello_World_Transmitter_Side_Programming ).
I'm using the hello world program and the transmitter code compiles and upload fine. The receiver code on the other hand gives me this error message

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

C:\Users\mvand\Documents\Arduino\nrf_reciver\nrf_reciver.ino: In function 'void loop()':

nrf_reciver:46:43: error: void value not ignored as it ought to be

   done = radio.read(data, sizeof(data));

                                       ^

Multiple libraries were found for "nRF24L01.h"

Used: C:\Users\mvand\Documents\Arduino\libraries\NRFLite

Not used: C:\Users\mvand\Documents\Arduino\libraries\RF24

exit status 1

void value not ignored as it ought to be

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

/////////////////////////////////////////////////////////////////////////////

Hear is the code.

//Receiver coding for the nrf24L01 radio transceiver.
//Hello World Example
// https://www.electroniclinic.com/
/*
  pins connections

  vcc 3.3
  gnd gnd
  ce pin9
  scn pin10
  sck pin13
  mosi pin11
  moso pin12


*/
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#define CE_PIN 9
#define CSN_PIN 10

const uint64_t pipe = 0xE8E8F0F0E1LL;

RF24 radio(CE_PIN, CSN_PIN);

char data[50] = "";

void setup()
{
  Serial.begin(9600);
  delay(1000);
  Serial.println("Nrf24L01 Receiver Starting");
  radio.begin();
  radio.openReadingPipe(1, pipe);
  radio.startListening();;
}

void loop()
{
  if ( radio.available() )
  {
    bool done = false;
    while (!done)
    {
      done = radio.read(data, sizeof(data));
      Serial.println(data);
    }
  }
  else
  {
    Serial.println("No radio available");
  }
}

Any help?

2

Check this first.

3

image

I can't find a library like that

4

That is my nrf libraries

5

I fixed that part I got two libraries saved so I removed the incorrect one
This is the error message now

/////////////////////////////////////////////////////////////////////////////

Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

C:\Users\mvand\Documents\Arduino\nrf_reciver\nrf_reciver.ino: In function 'void loop()':

nrf_reciver:46:43: error: void value not ignored as it ought to be

   done = radio.read(data, sizeof(data));

                                       ^

exit status 1

void value not ignored as it ought to be

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

////////////////////////////////////////////////////////////////////////////////////

6

I saw this at the bottom of the error

so I did it Now I got this error

/////////////////////////////////////////////////////////////////////////////////////

Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware -hardware C:\Users\mvand\Documents\ArduinoData\packages -tools C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\tools-builder -tools C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -tools C:\Users\mvand\Documents\ArduinoData\packages -built-in-libraries C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\libraries -libraries C:\Users\mvand\Documents\Arduino\libraries -fqbn=arduino:avr:mega:cpu=atmega2560 -ide-version=10819 -build-path C:\Users\mvand\AppData\Local\Temp\arduino_build_84433 -warnings=none -build-cache C:\Users\mvand\AppData\Local\Temp\arduino_cache_258498 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avr-gcc.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.arduinoOTA.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -verbose C:\Users\mvand\Documents\Arduino\nrf_reciver\nrf_reciver.ino

C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\arduino-builder -compile -logger=machine -hardware C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware -hardware C:\Users\mvand\Documents\ArduinoData\packages -tools C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\tools-builder -tools C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -tools C:\Users\mvand\Documents\ArduinoData\packages -built-in-libraries C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\libraries -libraries C:\Users\mvand\Documents\Arduino\libraries -fqbn=arduino:avr:mega:cpu=atmega2560 -ide-version=10819 -build-path C:\Users\mvand\AppData\Local\Temp\arduino_build_84433 -warnings=none -build-cache C:\Users\mvand\AppData\Local\Temp\arduino_cache_258498 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avr-gcc.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.arduinoOTA.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr -verbose C:\Users\mvand\Documents\Arduino\nrf_reciver\nrf_reciver.ino

Using board 'mega' from platform in folder: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr

Using core 'arduino' from platform in folder: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr

Detecting libraries used...

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\sketch\nrf_reciver.ino.cpp" -o nul

Alternatives for SPI.h: [SPI@1.0]

ResolveLibrary(SPI.h)

-> candidates: [SPI@1.0]

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src" "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\sketch\nrf_reciver.ino.cpp" -o nul

Alternatives for nRF24L01.h: [RF24@1.4.0]

ResolveLibrary(nRF24L01.h)

-> candidates: [RF24@1.4.0]

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src" "-IC:\Users\mvand\Documents\Arduino\libraries\RF24" "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\sketch\nrf_reciver.ino.cpp" -o nul

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src" "-IC:\Users\mvand\Documents\Arduino\libraries\RF24" "C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src\SPI.cpp" -o nul

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src" "-IC:\Users\mvand\Documents\Arduino\libraries\RF24" "-IC:\Users\mvand\Documents\Arduino\libraries\RF24\utility" "C:\Users\mvand\Documents\Arduino\libraries\RF24\RF24.cpp" -o nul

Generating function prototypes...

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src" "-IC:\Users\mvand\Documents\Arduino\libraries\RF24" "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\sketch\nrf_reciver.ino.cpp" -o "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\preproc\ctags_target_for_gcc_minus_e.cpp"

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\tools-builder\ctags\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\preproc\ctags_target_for_gcc_minus_e.cpp"

Compiling sketch...

"C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\variants\mega" "-IC:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI\src" "-IC:\Users\mvand\Documents\Arduino\libraries\RF24" "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\sketch\nrf_reciver.ino.cpp" -o "C:\Users\mvand\AppData\Local\Temp\arduino_build_84433\sketch\nrf_reciver.ino.cpp.o"

C:\Users\mvand\Documents\Arduino\nrf_reciver\nrf_reciver.ino: In function 'void loop()':

nrf_reciver:46:43: error: void value not ignored as it ought to be

   done = radio.read(data, sizeof(data));

                                       ^

Using library SPI at version 1.0 in folder: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.57.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\libraries\SPI

Using library RF24 at version 1.4.0 in folder: C:\Users\mvand\Documents\Arduino\libraries\RF24

exit status 1

void value not ignored as it ought to be

////////////////////////////////////////////////////////////////////////////////////////

7

In terms of code, this line is the problem:
done = radio.read(data, sizeof(data));
It's saying that the radio.read() method doesn't return anything so it makes no sense saving that in a variable.
Changing it to just:
radio.read(data, sizeof(data));
Should fix this specific error but may not make the code work.

I suspect the real problem is likely to be related to the wrong libraries being used. The tutorial you're following probably uses a different library where the radio.read() method does return a value.

8

done is a bool

9

enable full compiler-report
post the compiler-output as code-sections

10

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