XBee Point-to-Point Wireless Link

// XBee Point-to-Point Link -- transmitting end
// Sends an incrementing counter once a second over the XBee shield.
// The receiving end is a terminal on the USB explorer at the same baud.
//
// SparkFun XBee Shield UART switch:
//   DLINE = radio on D2/D3 (SoftwareSerial, leaves USB free) <- used here
//   UART  = radio on D0/D1 (hardware serial, blocks uploads)
// DLINE lets the USB serial monitor stay usable while the radio runs.

#include <SoftwareSerial.h>

const int XBEE_RX_PIN = 2;   // Arduino receives  <- XBee DOUT
const int XBEE_TX_PIN = 3;   // Arduino transmits -> XBee DIN
const long XBEE_BAUD  = 9600;   // XBee Series 1 factory default

SoftwareSerial xbee(XBEE_RX_PIN, XBEE_TX_PIN);

unsigned long counter = 0;

void setup() {
  Serial.begin(9600);    // local monitor, over USB
  xbee.begin(XBEE_BAUD); // the radio link
  Serial.println(F("transmitting..."));
}

void loop() {
  xbee.print(F("count="));
  xbee.println(counter);

  Serial.print(F("sent count="));   // so you can see it leave
  Serial.println(counter);

  counter++;
  delay(1000);
}