Need some hints for Xbee to an Arduino Pro

Wireless & IoT
1

I need some help connecting an XBee (Series 2) to an Arduino Pro (8 Mhz, 3.3V, 328). I’m not sure what I am doing wrong.

To test the XBee setup I did the following:

  • Master XBee connected to my Mac using the XBee USB Explorer.

  • Slave XBee plugged in a breadboard using the XBee Breakout board. This is the non-active board, with just more convenient pins. No voltage regulator is on there.

  • Slave XBee is connected to a 3.3V FTDI USB/TTL cable. Only VCC, GND, RX, TX are connected. This is connected to my laptop.

This setup works great. I can walk around the house with a my laptop and type stuff, which I see appear on the master Xbee in my home office.

So to replace that laptop with an Arduino Pro, I did the following:

Programmed the Arduino Pro with:

void setup()  { 
  Serial.begin(9600); 
} 

void loop()  { 
  Serial.print("Hello\r\n");    
  delay(1000);
}

I see this code works since it spits out Hello every second in the Arduino serial console.

Now I remove the FTDI board and add the Xbee to the setup, with the follow connections: VCC, GND, RX->DOUT, TX->DIN. I also added two LEDs to ON and ASSOC.

I power this setup with a small 3.3V regulator running from a 9V battery for now.

Arduino Pro power LED is on. Xbee power LED is on. Xbee ASSOC LED is on and starts blinking after a while.

But nothing is being transmitted.

What could go wrong here?[/code]

2

Data signal polarity?