nRF24L01 transmitter sketch issue [SOLVED]

Projects Programming
1

The attached code starts displaying ZEROS in the serial monitor then it changes to ONES without the button being pressed, can anyone spot my error?


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

#define buttonPin A0

int buttonState = 0;

RF24 radio(7, 8); // CE, CSN

// SCK - Pin 13, MOSI - Pin 11 & MISO - Pin 12

const byte address[6] = "00002";

void setup() {
  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
}
void loop() {

  buttonState = digitalRead(buttonPin);

  if (buttonState == 1)
  {
    buttonState = 1;
  }
  else if (buttonState == 0)
  {
    buttonState = 0;
  }
  
  Serial.println(buttonState);
  radio.write(&buttonState, sizeof(buttonState));
  delay(50);
}

The Receiver side works as it should

2

Other than that, you can remove the pointless code from digitalRead to Serial.println, you have no debounce.

3

Thanks for your reply,

I got rid of the code you suggested and the result is still the same, so adding debounce might do the trick, where do I add it?

cheers
Steve

4

Is the lack of a capacitor likely to cause the issue?

5

Use any of the dozens of libraries. I did a search on the Arduino.cc site and got this. There are MANY more.

Screenshot 2025-04-30 at 10.24.01
Screenshot 2025-04-30 at 10.24.012472×1422 396 KB

6

Here is a screen grab showing a library search for button, an example for the button library and some sample code. There are probably more libraries for this than any other function.

Screenshot 2025-04-30 at 10.29.32
Screenshot 2025-04-30 at 10.29.321534×1082 203 KB

7

try to change this line to:

pinMode(buttonPin, INPUT_PULLUP);
8

Anthony,

Thank you for your reply, that is exactly what I did before I read your message and it works perfectly.

Cheers
Steve

9

You're welcome. In that case don't hesitate to set the topic as solved :slight_smile:
image

10

Done! thanks for the help!

Steve

11

If you look at my previous post, there is a picture showing you how to set the topic as solved. What you did is just editing the title :slight_smile:
At the bottom of each post you have a button to select the said post as the solution :wink: