Adruino Mega and Uno R3 Wireless Compatibility

Hello, I'm not familiar with the Mega but glancing over the tutorial I see it uses different SPI pins then the UNO uses. Also on the nrf24_server sketch it shows using RH_NRF24 nrf24 but in the comments section in the RH_NRF24 library they show using the constructor RH_NRF24(8, 53).

/// For an Arduino Mega:
/// \code
/// Mega Sparkfun WRL-00691
/// 5V-----------VCC (3.3V to 7V in)
/// pin D8-----------CE (chip enable in)
/// SS pin D53----------CSN (chip select in)
/// SCK pin D52----------SCK (SPI clock in)
/// MOSI pin D51----------SDI (SPI Data in)
/// MISO pin D50----------SDO (SPI data out)
/// IRQ (Interrupt output, not connected)
/// GND----------GND (ground in)
/// \endcode
/// and you can then use the constructor RH_NRF24(8, 53).

Hope this helps.

Arlo

Arlo,

Thank you for your time and help! I have read through what it is your recommend several times. I have come to understand that you have provided the pinup for an Arduino Mega with the NRF24L01. Now, what I still do not quite understand is whether that which you wrote addresses potential issues with coding? I must admit I am not very well versed in the coding aspect of things. Any further help would be greatly appreciated. 

@magnusmagpie  Don't feel alone , my coding is abysmal at best but my attempt at it would be on Bill's server sketch line 23 I would add RH_NRF24 (8, 53);

I hope someone else jumps in if I'm wrong on this.

Arlo

@Arlo

Thanks for the further help. I am still a bit confused and I hope its not to much to ask for some further clarification:

@magnusmagpie I would use the first one above the void setup(). Make sure you un-comment out the line, just remove the // in front of the RH-NRF24 (8, 53);

If that doesn't work then I might try commenting out the RH_NRF24 nrf24; 4 lines above it.

Lot of trial and error sometimes , but great when it finally works.

Arlo

@Arlo

Thanks. I actually figured it out.

I have moved on to the joystick Demo and I am now struggling to make the server (my Mega) receive the joystick values from my Uno (client, which seems to be working fine). How would I solve this issue assuming that I need to make the code recognize the pins 8 and 53 as I did before?

The code is as follows:

/*
nRF24L01+ Joystick Receiver Demo
nrf24l01-joy-rcv-demo.ino
nRF24L01+ Receiver with Joystick Decode
Use with Joystick Transmitter Demo
DroneBot Workshop 2018
https://dronebotworkshop.com
*/

// Include RadioHead ReliableDatagram & NRF24 Libraries
#include <RHReliableDatagram.h>
#include <RH_NRF24.h>

// Include dependant SPI Library
#include <SPI.h>

// Define addresses for radio channels
#define CLIENT_ADDRESS 1
#define SERVER_ADDRESS 2

// Create an instance of the radio driver
RH_NRF24 RadioDriver;

// Sets the radio driver to NRF24 and the server address to 2
RHReliableDatagram RadioManager(RadioDriver, SERVER_ADDRESS);

// Define a message to return if values received
uint8_t ReturnMessage[] = "JoyStick Data Received";

// Define the Message Buffer
uint8_t buf[RH_NRF24_MAX_MESSAGE_LEN];

void setup()
{
// Setup Serial Monitor
Serial.begin(9600);

// Initialize RadioManager with defaults - 2.402 GHz (channel 2), 2Mbps, 0dBm
if (!RadioManager.init())
Serial.println("init failed");
}

void loop()
{
if (RadioManager.available())
{
// Wait for a message addressed to us from the client
uint8_t len = sizeof(buf);
uint8_t from;
if (RadioManager.recvfromAck(buf, &len, &from))
//Serial Print the values of joystick
{
Serial.print("got request from : 0x");
Serial.print(from, HEX);
Serial.print(": X = ");
Serial.print(buf[0]);
Serial.print(" Y = ");
Serial.print(buf[1]);
Serial.print(" Z = ");
Serial.println(buf[2]);

// Send a reply back to the originator client, check for error
if (!RadioManager.sendtoWait(ReturnMessage, sizeof(ReturnMessage), from))
Serial.println("sendtoWait failed");
}
}
}

@magnusmagpie  I assumed you were working with Bill's server sketch before when I suggested you add RH_NRF24 (8, 53); to line 23 below the RH_NRF24 RadioDriver; code.

Arlo