NRFL24 SPI works on UNO but not Mega

Using Arduino Project Guidance
1

Good morning . I have a short program that works fine with UNO's but after three days can't get MEGA to play ball.
I am using a NRFL24L01 to link two boards, I am using the correct pins 50,51,52 with 7 and 8 on the MEGA.
The power supplies are stable and have decoupling capacitors next to the RF units. Pin 53 is taken LOW.
I have looked at as much as i can but can't explain why it is not working. Is there something in the library which is not combatable?
Code:

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
//#define button1 3
//#define button2 5
#define SS 53
RF24 radio(7, 8); // CE, CSN
const byte addresses[][6] = {"00001", "00002"};
int button1State = 0;
int button2State = 0;

void setup() {
pinMode(SS, OUTPUT);
digitalWrite(SS, LOW);
radio.begin();
radio.openWritingPipe(addresses[1]); // 00002
radio.openReadingPipe(1, addresses[0]); // 00001
radio.setPALevel(RF24_PA_MIN);
}
void loop() {
delay(5);
radio.stopListening();
int potValue = analogRead(A0);
int angleValue = map(potValue, 0, 1023, 0, 180);
radio.write(&angleValue, sizeof(angleValue));
delay(5);
/* button1State = digitalRead(button1);
radio.write(&button1State, sizeof(button1State));

button2State = digitalRead(button2);
radio.write(&button2State, sizeof(button2State));*/
}
Any advice please.

2

Where do the NRF24s get their 3.3V supply from ?

3

HI srnet, 3v3 supply is from a separate L787L33 voltage reg with 47uF decoupling right next to pins.

4

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the </> icon above the compose window) to make it easier to read and copy for examination

5

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.