A fortnight ago I purchased two shields from Embedded Coolness for a couple of nRF24L01 based projects (quadcopter & robot control system) I’m working on.The shields were very reasonably priced and took roughly 10-15 minutes each to assemble.

nRF24L01 Shield with short range module

Though intended for Arduino based projects the hardware SPI port works with the Nordic nRF24L01 .Net Micro Framework Driver on Codeplex.

I adapted the sample application included with the Nordic nRF24L01 .Net Micro Framework Driver source from codeplex to give a minimal working Netduino example.

...
public class EmbeddCoolnessTestHarness
{
private const byte channel = 10;
private readonly OutputPort _led = new OutputPort(Pins.ONBOARD_LED, false);
private readonly NRF24L01Plus _module;
private Timer _timer;
private byte _token;
private readonly byte[] _myAddress = Encoding.UTF8.GetBytes("NetP1");
private readonly byte[] _otherBoard = Encoding.UTF8.GetBytes("NetP2");

public EmbeddCoolnessTestHarness()
{
_module = new NRF24L01Plus();
}

public void Run()
{
_module.OnDataReceived += OnReceive;
_module.OnTransmitFailed += OnSendFailure;
_module.OnTransmitSuccess += OnSendSuccess;

// we need to call Initialize() and Configure() before we start using the module
_module.Initialize(SPI.SPI_module.SPI1, Pins.GPIO_PIN_D7, Pins.GPIO_PIN_D3, Pins.GPIO_PIN_D2);
_module.Configure(_myAddress, channel);
_module.Enable();

_timer = new Timer(SendMessage, null, new TimeSpan(0, 0, 0, 1), new TimeSpan(0, 0, 0, 1));
}

private void OnSendSuccess()
{
_led.Write(false);
}

private void OnSendFailure()
{
Debug.Print("Send failed!");
}

private void OnReceive(byte[] data)
{
Debug.Print("Token = " + data[0]);
}

private void SendMessage(object state)
{
_led.Write(true);
_module.SendTo(_otherBoard, new[] { _token });
_token++;
}
}