We will use the ZigduinoRadio library in order to send data between two or more Sparrow nodes. You can download the library from here.

Here's an example code:

/*
 
Run this sketch on two Zigduinos, open the serial monitor at 9600 baud
and type in stuff. Watch the Rx Zigduino output what you've input into
the serial port of the Tx Zigduino.
 
*/
 
#include <ZigduinoRadio.h>
 
void setup()
{
  ZigduinoRadio.begin(11);
  Serial.begin(9600);
 
  ZigduinoRadio.attachError(errHandle);
  ZigduinoRadio.attachTxDone(onXmitDone);
}
 
void loop()
{
  if (Serial.available())
  {
    ZigduinoRadio.beginTransmission();
 
    Serial.println();
    Serial.print("Tx: ");
 
    while(Serial.available())
    {
      char c = Serial.read();
      Serial.write(c);
      ZigduinoRadio.write(c);
    }
 
    Serial.println(); 
 
    ZigduinoRadio.endTransmission();
  }
 
  if (ZigduinoRadio.available())
  {
    Serial.println();
    Serial.print("Rx: ");
 
    while(ZigduinoRadio.available())
      Serial.write(ZigduinoRadio.read());
 
    Serial.println();
    Serial.print("LQI: ");
    Serial.print(ZigduinoRadio.getLqi(), 10);
    Serial.print(", RSSI: ");
    Serial.print(ZigduinoRadio.getLastRssi(), 10);
    Serial.print(" dBm, ED: ");
    Serial.print(ZigduinoRadio.getLastEd(), 10);
    Serial.println("dBm");
  }
 
 
  delay(1000);
}
 
void errHandle(radio_error_t err)
{
  Serial.println();
  Serial.print("Error: ");
  Serial.print((uint8_t)err, 10);
  Serial.println();
}
 
void onXmitDone(radio_tx_done_t x)
{
  Serial.println();
  Serial.print("TxDone: ");
  Serial.print((uint8_t)x, 10);
  Serial.println();
}