October 19, 2008
Announcing the Arduino Duemilanove [ http://arduino.cc/en/Main/ArduinoBoardDuemilanove ], the latest and easiest-to-use version of the basic Arduino USB board.
The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet [ http://www.atmel.com/dyn/resources/prod_documents/doc2545.pdf ] ). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
"Duemilanove" means 2009 in Italian and is named after the year of its release. The Duemilanove is the latest in a series of USB Arduino boards; for a comparison with previous versions, see the index of Arduino boards [ http://arduino.cc/en/Main/Boards ].
Schematic & Reference Design
EAGLE files: arduino-duemilanove-reference-design.zip [ http://arduino.cc/en/uploads/Main/arduino-duemilanove-reference-design.zip ]
Schematic: arduino-duemilanove-schematic.pdf [ http://arduino.cc/en/uploads/Main/arduino-duemilanove-schematic.pdf ]
|Input Voltage (recommended)||7-12V|
|Input Voltage (limits)||6-20V|
|Digital I/O Pins||14 (of which 6 provide PWM output)|
|Analog Input Pins||6|
|DC Current per I/O Pin||40 mA|
|DC Current for 3.3V Pin||50 mA|
|Flash Memory||16 KB (of which 2 KB used by bootloader)|
|Clock Speed||16 MHz|
The Arduino Duemilanove can be powered via the USB connection or with an external power supply. The power source is selected automatically.
External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector.
The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.
The power pins are as follows:
The ATmega168 has 16 KB of flash memory for storing code (of which 2 KB is used for the bootloader). It has 1 KB of SRAM and 512 bytes of EEPROM (which can be read and written with the EEPROM library [ http://www.arduino.cc/en/Reference/EEPROM ] ).
Input and Output
Each of the 14 digital pins on the Duemilanove can be used as an input or output, using pinMode() [ http://arduino.cc/en/Reference/PinMode ], digitalWrite() [ http://arduino.cc/en/Reference/DigitalWrite ], and digitalRead() [ http://arduino.cc/en/Reference/DigitalRead ] functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:
The Duemilanove has 6 analog inputs, each of which provide 10 bits of resolution (i.e. 1024 different values). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and some low-level code. Additionally, some pins have specialized functionality:
There are a couple of other pins on the board:
See also the mapping between Arduino pins and ATmega168 ports [ http://arduino.cc/en/Hacking/PinMapping168 ].
The Arduino Duemilanove has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega168 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). An FTDI FT232RL on the board channels this serial communication over USB and the FTDI drivers [ http://www.ftdichip.com/Drivers/VCP.htm ] (included with the Arduino software) provide a virtual com port to software on the computer. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board.
A SoftwareSerial library [ http://www.arduino.cc/en/Reference/SoftwareSerial ] allows for serial communication on any of the Duemilanove's digital pins.
The ATmega168 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation on the Wiring website [ http://wiring.org.co/reference/libraries/Wire/index.html ] for details. To use the SPI communication, please see the ATmega168 datasheet.
The Arduino Duemilanove can be programmed with the Arduino software (download [ http://arduino.cc/en/Main/Software ] ). For details, see the reference [ http://arduino.cc/en/Reference/HomePage ] and tutorials [ http://arduino.cc/en/Tutorial/HomePage ].
The ATmega168 on the Arduino Duemilanove comes preburned with a bootloader [ http://arduino.cc/en/Tutorial/Bootloader ] that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the original STK500 protocol (reference [ http://www.atmel.com/dyn/resources/prod_documents/doc2525.pdf ], C header files [ http://www.atmel.com/dyn/resources/prod_documents/avr061.zip ] ).
You can also bypass the bootloader and program the ATmega168 through the ICSP (In-Circuit Serial Programming) header; see these instructions [ http://arduino.cc/en/Hacking/Programmer ] for details.
Automatic (Software) Reset
Rather then requiring a physical press of the reset button before an upload, the Arduino Duemilanove is designed in a way that allows it to be reset by software running on a connected computer. One of the hardware flow control lines (DTR) of the FT232RL is connected to the reset line of the ATmega168 via a 100 nanofarad capacitor. When this line is asserted (taken low), the reset line drops long enough to reset the chip. The Arduino software uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment. This means that the bootloader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload.
This setup has other implications. When the Duemilanove is connected to either a computer running Mac OS X or Linux, it resets each time a connection is made to it from software (via USB). For the following half-second or so, the bootloader is running on the Duemilanove. While it is programmed to ignore malformed data (i.e. anything besides an upload of new code), it will intercept the first few bytes of data sent to the board after a connection is opened. If a sketch running on the board receives one-time configuration or other data when it first starts, make sure that the software with which it communicates waits a second after opening the connection and before sending this data.
The Duemilanove contains a trace that can be cut to disable the auto-reset. The pads on either side of the trace can be soldered together to re-enable it. It's labeled "RESET-EN".
USB Overcurrent Protection
The Arduino Duemilanove has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
The maximum length and width of the Duemilanove PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Three screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.
Listen to the name
This is how you can pronounce the board's name in proper Italian, download the sound file in the format that better suits you: WAV [ http://arduino.cc/en/uploads/Main/Arduino_Duemilanove.wav ], OGG [ http://arduino.cc/en/uploads/Main/Arduino_Duemilanove.ogg ] , MP3 [ http://arduino.cc/en/uploads/Main/Arduino_Duemilanove.mp3 ] , FLAC [ http://arduino.cc/en/uploads/Main/Arduino_Duemilanove.flac ] , WMA [ http://arduino.cc/en/uploads/Main/Arduino_Duemilanove.wma ]
Copyright 2008 http://www.arduino.cc/