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Introduction | How To: Windows, Mac OS X, Linux; Arduino Mini, Arduino BT | Troubleshooting | Board | Environment

## ArduinoBT

The Arduino BT is an Arduino board with built-in bluetooth module, allowing for wireless communication. To get started with the Arduino BT, follow the directions for the Arduino NG on your operating system (Windows, Mac OS X, Linux), with the following modifications:

- First, pair the Arduino BT with your computer and create a virtual serial port for it. Look for a bluetooth device called ARDUINOBT and the pass code is 12345.

- Select ATmega168 from the Tools | Microcontroller (MCU) menu of the Arduino environment.

### Information about the Arduino BT

The Arduino BT has a more powerful chip than the regular Arduino board (an ATmega168 instead of an ATmega8), meaning:

- Your sketches can be twice as big (14 KB instead of 7 KB).

- There are three extra PWM outputs (on pins 3, 5, and 6) in addition to the three on regular Arduino boards (pins 9, 10, and 11).

- There are two extra analog inputs (8 total).

The Arduino BT is more fragile and easy to break than a regular Arduino board.

- Don't power the board with more than 5.5 volts to the or reverse the polarity (power and ground pins) of your power supply, or you might kill the ATmega168 on the Arduino BT. The Arduino BT can, however, run with a minimum of 1.2 volts, making it easier to power with batteries.

- You can't remove the ATmega168, so if you kill it, you need a new Arduino BT.

For more details, see the Arduino BT hardware page.

### Using the Arduino BT

Only communicate at 115200 baud using the serial commands (e.g. `Serial.begin()`, etc.). This is the speed for which the bluetooth is configured.

Pin 7 is connected to the reset pin of the bluetooth module; don't use it for anything (except resetting the module).

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