Main.ArduinoBoardDuemilanove History

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June 06, 2010, at 11:18 PM by Equipo Traduccion -
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El Arduino Duemilanove ("2009") es una placa con microcontrodor basada en el ATmega168(datasheet) o el ATmega328 (datasheet)., Tiene 14 pines con entradas/salidas digitales (6 de las cuales pueden ser usadas como salidas PWM), 6 entradas analógicas, un cristal oscilador a 16Mhz, conexión USB, entrada de alimentación, una cabecera ISCP, y un botón de reset.Contiene todo lo necesario para utilizar el microcontrolador; simplemente conéctalo a tu ordenador a través del cable USB o aliméntalo con un transformador o una batería para empezar a trabajar con el.

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El Arduino Duemilanove ("2009") es una placa con microcontrolador basada en el ATmega168(datasheet) o el ATmega328 (datasheet)., Tiene 14 pines con entradas/salidas digitales (6 de las cuales pueden ser usadas como salidas PWM), 6 entradas analógicas, un cristal oscilador a 16Mhz, conexión USB, entrada de alimentación, una cabecera ISCP, y un botón de reset.Contiene todo lo necesario para utilizar el microcontrolador; simplemente conectalo a tu ordenador a través del cable USB o aliméntalo con un transformador o una batería para empezar a trabajar con el.

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Pins E/S digitales14 (6 proporcionan salida PWM)
Pins de entrada analógica6
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Pines E/S digitales14 (6 proporcionan salida PWM)
Pines de entrada analógica6
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El Arduino Duemilanove puede ser alimentado via la conexion USB o con uan fuente de alimentación externa. El origen de la alimentacion se selecciona automáticamente.

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El Arduino Duemilanove puede ser alimentado vía la conexión USB o con una fuente de alimentación externa. El origen de la alimentación se selecciona automáticamente.

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La placa puede trabajar con una alimentación externa de entre 6 a 2o voltios. Si el voltaje suministrado en s inferior a 7V el pin de 5V puede proporcionar menos de 5 Voltios y la placa puede volverse inestable, si se usan mas de 12V los reguladores de voltaje se pueden sobrecalentar y dañar la placa. El rango recomendado es de 7 a 12 voltios.

Los pines de alimentacion son los siguientes::

  • VIN. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.

  • 5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.

  • 3V3. A 3.3 volt supply generated by the on-board FTDI chip. Maximum current draw is 50 mA.

  • GND. Ground pins.

Memory

The ATmega168 has 16 KB of flash memory for storing code (of which 2 KB is used for the bootloader); the ATmega328 has 32 KB, (also with 2 KB used for the bootloader). The ATmega168 has 1 KB of SRAM and 512 bytes of EEPROM (which can be read and written with the EEPROM library); the ATmega328 has 2 KB of SRAM and 1 KB of EEPROM.

Input and Output

Each of the 14 digital pins on the Duemilanove can be used as an input or output, using pinMode(), digitalWrite(), and 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:

  • Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip.

  • External Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.

  • PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.

  • SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.

  • LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.

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 the analogReference() function. Additionally, some pins have specialized functionality:

  • I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library.

There are a couple of other pins on the board:

  • AREF. Reference voltage for the analog inputs. Used with analogReference().

  • Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

See also the mapping between Arduino pins and ATmega168 ports.

Communication

The Arduino Duemilanove has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega168 and ATmega328 provide 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 (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. The RX and TX LEDs on the board will flash when data is being transmitted via the FTDI chip and USB connection to the computer (but not for serial communication on pins 0 and 1).

A SoftwareSerial library allows for serial communication on any of the Duemilanove's digital pins.

The ATmega168 and ATmega328 also support I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation for details. To use the SPI communication, please see the ATmega168 or ATmega328 datasheet.

Programming

The Arduino Duemilanove can be programmed with the Arduino software (download). Select "Arduino Diecimila or Duemilanove w/ ATmega168" or "Arduino Duemilanove w/ ATmega328" from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials.

The ATmega168 or ATmega328 on the Arduino Duemilanove comes preburned with a 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, C header files).

You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header; see these instructions 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 or ATmega328 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". You may also be able to disable the auto-reset by connecting a 110 ohm resistor from 5V to the reset line; see this forum thread for details.

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.

Physical Characteristics

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, OGG, MP3, FLAC, WMA

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La placa puede trabajar con una alimentación externa de entre 6 a 20 voltios. Si el voltaje suministrado es inferior a 7V el pin de 5V puede proporcionar menos de 5 Voltios y la placa puede volverse inestable, si se usan mas de 12V los reguladores de voltaje se pueden sobrecalentar y dañar la placa. El rango recomendado es de 7 a 12 voltios.

Los pines de alimentación son los siguientes:

  • VIN. La entrada de voltaje a la placa Arduino cando se esta usando una fuente externa de alimentación (en opuesto a los 5 voltios de la conexión USB). Se puede proporcionar voltaje a través de este pin, o, si se esta alimentado a través de la conexión de 2.1mm , acceder a ella a través de este pin.

  • 5V. La fuente de voltaje estabilizado usado para alimentar el microcontrolador y otros componentes de la placa. Esta puede provenir de VIN a través de un regulador integrado en la placa, o proporcionada directamente por el USB o otra fuente estabilizada de 5V.

  • 3V3. Una fuente de voltaje a 3.3 voltios generada en el chip FTDI integrado en la placa. La corriente máxima soportada 50mA.

  • GND. Pines de toma de tierra.

Memoria

El ATmega328 tiene 32KB (el ATmega168 tiene 16 KB) de memoria flash para almacenar código (2KB son usados para el arranque del sistema(bootloader).El ATmega328 tiene 2 KB (Atmega168 1 KB) de memoria SRAM . El ATmega328 tiene 1KB (ATmega168 512 bytes) de EEPROM , que puede a la cual se puede acceder para leer o escribir con la [Reference/EEPROM |librería EEPROM]].

Entradas y Salidas

Cada uno de los 14 pines digitales en el Duemilanove pueden utilizarse como entradas o como salidas usando las funciones pinMode(), digitalWrite(), y digitalRead() . Las E/S operan a 5 voltios. Cada pin puede proporcionar o recibir una intensidad máxima de 40mA y tiene una resistencia interna (desconectada por defecto)de 20-50kOhms. Además, algunos pines tienen funciones especializadas:

  • Serie: 0 (RX) y 1 (TX). Usado para recibir (RX) transmitir (TX) datos a través de puerto serie TTL. Estos pins estan conectados a los pines correspondientes del chip FTDI USB-to-TTL.

  • Interrupciones Externas: 2 y 3. Estos pines se pueden configurar para lanzar una interrupción en un valor LOW(0V), en flancos de subida o bajada (cambio de LOW a HIGH(5V) o viceversa), o en cambios de valor. Ver la función attachInterrupt() para as detalles.

  • PWM: 3, 5, 6, 9, 10, y 11. Proporciona una salida PWM (Pulse Wave Modulation, modulación de onda por pulsos) de 8 bits de resolución (valores de 0 a 255) a través de la función analogWrite().

  • SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). Estos pines proporcionan comunicación SPI, que a pesar de que el hardware la proporcione actualmente no esta incluido en el lenguaje Arduino.

  • LED: 13. Hay un LED integrado en la placa conectado al pin digital 13, cuando este pin tiene un valor HIGH(5V) el LED se enciende y cuando este tiene un valor LOW(0V) este se apaga.

El Duemilanove tiene 6 entradas analógicas, y cada una de ellas proporciona una resolución de 10bits (1024 valores). Por defecto se mide de tierra a 5 voltios, aunque es posible cambiar la cota superior de este rango usando el pin AREF y la función analogReference(). Además algunos pines tienen funciones especializadas:

  • I2C: 4 (SDA) y 5 (SCL). Soporte del protocolo de comunicaciones I2C (TWI) usando la librería Wire.

Hay unos otros pines en la placa:

  • AREF. Voltaje de referencia para la entradas analógicas.Usado poranalogReference().

  • Reset. Suministrar un valor LOW(0V) para reiniciar el microcontrolador. Típicamente usado para añadir un botón de reset a los shields que no dejan acceso a este botón en la placa.

Mas info en mapeo de pines Arduino y puertos del chip ATmega168.

Comunicaciones

EL Arduino Duemilanove facilita en varios aspectos la comunicación con el ordenador, otro Arduino o otros microcontroladores. Tanto el ATmega328 como el Atmega168 proporciona comunicación vía serie UART TTL (5V), disponible a través de los pines digitales 0(RX) y 1(TX). Un chip FTDI FT232RL integrado en la placa canaliza esta comunicación serie a traes del USB y los drivers FTDI (incluidos en el software de Arduino) proporcionan un puerto serie virtual en el ordenador. El software incluye un monitor de puerto serie que permite enviar y recibir información textual de la placa Arduino. Los LEDS RX y TX de la placa parpadearan cuando se detecte comunicación transmitida través del chip FTDI y la conexión USB (no parpadearan si se usa la comunicación serie a través de los pines 0 y 1).

La librería SoftwareSerial permite comunicación serie por cualquier par de pines digitales del Duemilanove.

Tanto el ATmega168 y ATmega328 también soportan la comunicación I2C (TWI) y SPI . El software de Arduino incluye una librería Wire para simplificar el uso el bus I2C, ver The la documentación para mas detalles. Para el uso de la comunicación SPI, mira el la hoja de especificaciones (datasheet) del ATmega168 o ATmega328 .

Programación

El Arduino Duemilanove se puede programar a través del software Arduino(descargar). Selecciona "Arduino Duemilanove w/ ATmega328" o "Arduino Diecimila or Duemilanove w/ ATmega168" del menu Tools > Board (dependiendo del microcontrolador de tu placa). mas detalle ver referencia y tutoriales.

El ATmega328 y el ATmega168 en las placas Arduino Duemilanove viene precargado con un gestor de arranque (bootloader) que permite cargar nuevo código sin necesidad de un programador por hardware externo. Se comunica utilizando el protocolo STK500 original(referencia, archivo de cabecera C).

También te puedes saltar el gestor de arranque y programar directamente el microcontrolador a través del puerto ISCP (In Circuit Serial Programming); para mas detalles ver estas instrucciones.

Reinicio Automático (Software)

En vez de necesitar reiniciar presionando físicamente el botón de reset antes de cargar, el Arduino Duemilanove esta diseñado de manera que es posible reiniciar por software desde el ordenador donde este conectado. Una de las lineas de control de flujo(DTR) del FT232RL esta conectada a la linea de reinicio del ATmega328 o ATmega168 a través de un condensador de 100 nanofaradios. Cuando la linea se pone a LOW(0V), la linea de reinicio también se pone a LOW el tiempo suficiente para reiniciar el chip. El software de Arduino utiliza esta característica para permitir cargar los sketches con solo apretar un botón del entorno. Dado que el gestor de arranque tiene un lapso de tiempo para ello, la activación del DTR y la carga del sketch se coordinan perfectamente.

Esta configuración tiene otras implicaciones. Cuando el Duemilanove se conecta a un ordenador con Mac OS X o Linux, esto reinicia la placa cada vez que se realiza una conexión desde el software (vía USB). El medio segundo aproximadamente posterior, el gestor de arranque se esta ejecutando. A pesar de estar programado para ignorar datos mal formateados (ej. cualquier cosa que la carga de un programa nuevo) intercepta los primeros bytes que se envían a la placa justo después de que se abra la conexión.Si un sketch ejecutándose en la placa recibe algun tipo de configuración inicial o otro tipo de información al inicio del programa, asegurate que el software con el cual se comunica espera un segundo después de abrir la conexión antes de enviar los datos.

El Duemilanove contiene una pista que puede ser cortada para deshabilitar el auto-reset. Las terminaciones a cada lado pueden ser soldadas entre ellas para rehabilitarlo. Están etiquetadas con "RESET-EN". También podéis deshabilitar el auto-reset conectando una resistencia de 110 ohms desde el pin 5V al pin de reset; mirar este hilo del foro para mas detalles.

Protección contra sobretensiones en USB

El Arduio Duemilanove tiene un multifusible reinicializable que protege la conexión USB de tu ordenador de cortocircuitos y sobretensiones. A aparte que la mayoría de ordenadores proporcionan su propia protección interna, el fusible proporciona un capa extra de protección. Si mas de 500mA son detectados en el puerto USB, el fusible automáticamente corta la conexión hasta que el cortocircuito o la sobretensión desaparece.

Características Físicas

La longitud y amplitud máxima de la placa Duemilanove es de 2.7 y 2.1 pulgadas respectivamente, con el conector USB y la conexión de alimentación sobresaliendo de estas dimensiones. Tres agujeros para fijación con tornillos permiten colocar la placa en superficies y cajas. Ten en cuenta que la distancia entre los pines digitales 7 y 8 es 160 mil (0,16"), no es múltiple de la separación de 100 mil entre los otros pines.

Escucha el nombre

Esta es la manera en la que se pronuncia el nombre de la placa en Italiano, descarga el archivo de sonido en el formato que mas te convenga:

 WAV, OGG, MP3, FLAC, WMA
June 04, 2010, at 12:30 AM by Equipo Traduccion -
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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:

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La placa puede trabajar con una alimentación externa de entre 6 a 2o voltios. Si el voltaje suministrado en s inferior a 7V el pin de 5V puede proporcionar menos de 5 Voltios y la placa puede volverse inestable, si se usan mas de 12V los reguladores de voltaje se pueden sobrecalentar y dañar la placa. El rango recomendado es de 7 a 12 voltios.

Los pines de alimentacion son los siguientes::

June 04, 2010, at 12:24 AM by Equipo Traduccion -
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Overview

The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet) or ATmega328 (datasheet). 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.

Summary

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Visión general

El Arduino Duemilanove ("2009") es una placa con microcontrodor basada en el ATmega168(datasheet) o el ATmega328 (datasheet)., Tiene 14 pines con entradas/salidas digitales (6 de las cuales pueden ser usadas como salidas PWM), 6 entradas analógicas, un cristal oscilador a 16Mhz, conexión USB, entrada de alimentación, una cabecera ISCP, y un botón de reset.Contiene todo lo necesario para utilizar el microcontrolador; simplemente conéctalo a tu ordenador a través del cable USB o aliméntalo con un transformador o una batería para empezar a trabajar con el.

"Duemilanove" significa 2009 en italiano que fue el año cuando salio al mercado. El Duemilanove es el mas popular en dentro de las series de placas con USB: para una comparativa con el resto de placas mira el índice de placas Arduino.

Resumen

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MicrocontrollerATmega168
Operating Voltage5V
Input Voltage (recommended)7-12V
Input Voltage (limits)6-20V
Digital I/O Pins14 (of which 6 provide PWM output)
Analog Input Pins6
DC Current per I/O Pin40 mA
DC Current for 3.3V Pin50 mA
Flash Memory16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader
SRAM1 KB (ATmega168) or 2 KB (ATmega328)
EEPROM512 bytes (ATmega168) or 1 KB (ATmega328)
Clock Speed16 MHz

Schematic & Reference Design

EAGLE files: arduino-duemilanove-reference-design.zip

Schematic: arduino-duemilanove-schematic.pdf

Power

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.

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MicrocontroladorATmega368 (ATmega168 en versiones anteriores)
Voltaje de funcionamiento5V
Voltaje de entrada (recomendado)7-12V
Voltaje de entrada (limite)6-20V
Pins E/S digitales14 (6 proporcionan salida PWM)
Pins de entrada analógica6
Intensidad por pin40 mA
Intensidad en pin 3.3V50 mA
Memoria Flash16 KB (ATmega168) o 32 KB (ATmega328) de las cuales 2 KB las usa el gestor de arranque(bootloader)
SRAM1 KB (ATmega168) o 2 KB (ATmega328)
EEPROM512 bytes (ATmega168) o 1 KB (ATmega328)
Velocidad de reloj16 MHz

Esquemas y Planos de referencia

Archivo EAGLE: arduino-duemilanove-reference-design.zip

Esquemas: arduino-duemilanove-schematic.pdf

Alimentación

El Arduino Duemilanove puede ser alimentado via la conexion USB o con uan fuente de alimentación externa. El origen de la alimentacion se selecciona automáticamente.

Las fuentes de alimentación externas (no-USB) pueden ser tanto un transformador o una batería. El transformador se puede conectar usando un conector macho de 2.1mm con centro positivo en el conector hembra de la placa. Los cables de la batería puede conectarse a los pines Gnd y Vin en los conectores de alimentación (POWER)

February 05, 2010, at 11:49 PM by David A. Mellis -
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February 05, 2010, at 11:49 PM by David A. Mellis -
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Schematic & Reference Design

EAGLE files: arduino-duemilanove-reference-design.zip

Schematic: arduino-duemilanove-schematic.pdf

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July 14, 2009, at 11:21 PM by David A. Mellis -
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The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet) or ATmega328 (datasheet). 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.

to:

The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet) or ATmega328 (datasheet). 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.

May 08, 2009, at 01:21 PM by David A. Mellis -
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The Arduino Duemilanove can be programmed with the Arduino software (download). For details, see the reference and tutorials.

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The Arduino Duemilanove can be programmed with the Arduino software (download). Select "Arduino Diecimila or Duemilanove w/ ATmega168" or "Arduino Duemilanove w/ ATmega328" from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials.

March 24, 2009, at 01:24 PM by David A. Mellis -
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The ATmega168 and ATmega328 also support 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 for details. To use the SPI communication, please see the ATmega168 or ATmega328 datasheet.

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The ATmega168 and ATmega328 also support I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation for details. To use the SPI communication, please see the ATmega168 or ATmega328 datasheet.

March 24, 2009, at 01:24 PM by David A. Mellis -
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  • I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the Wiring website).
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  • I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library.
March 24, 2009, at 12:22 PM by David A. Mellis -
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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:

to:

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 the analogReference() function. Additionally, some pins have specialized functionality:

March 07, 2009, at 10:39 AM by David A. Mellis - adding ATmega328
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The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet). 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.

to:

The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet) or ATmega328 (datasheet). 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.

Changed lines 28-30 from:
Flash Memory16 KB (of which 2 KB used by bootloader)
SRAM1 KB
EEPROM512 bytes
to:
Flash Memory16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader
SRAM1 KB (ATmega168) or 2 KB (ATmega328)
EEPROM512 bytes (ATmega168) or 1 KB (ATmega328)
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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).

to:

The ATmega168 has 16 KB of flash memory for storing code (of which 2 KB is used for the bootloader); the ATmega328 has 32 KB, (also with 2 KB used for the bootloader). The ATmega168 has 1 KB of SRAM and 512 bytes of EEPROM (which can be read and written with the EEPROM library); the ATmega328 has 2 KB of SRAM and 1 KB of EEPROM.

Changed lines 84-85 from:

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 (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. The RX and TX LEDs on the board will flash when data is being transmitted via the FTDI chip and USB connection to the computer (but not for serial communication on pins 0 and 1).

to:

The Arduino Duemilanove has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega168 and ATmega328 provide 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 (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. The RX and TX LEDs on the board will flash when data is being transmitted via the FTDI chip and USB connection to the computer (but not for serial communication on pins 0 and 1).

Changed lines 88-89 from:

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 for details. To use the SPI communication, please see the ATmega168 datasheet.

to:

The ATmega168 and ATmega328 also support 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 for details. To use the SPI communication, please see the ATmega168 or ATmega328 datasheet.

Changed lines 94-97 from:

The ATmega168 on the Arduino Duemilanove comes preburned with a 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, C header files).

You can also bypass the bootloader and program the ATmega168 through the ICSP (In-Circuit Serial Programming) header; see these instructions for details.

to:

The ATmega168 or ATmega328 on the Arduino Duemilanove comes preburned with a 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, C header files).

You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header; see these instructions for details.

Changed lines 100-101 from:

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.

to:

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 or ATmega328 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.

January 26, 2009, at 07:31 PM by David A. Mellis -
Changed lines 104-105 from:

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".

to:

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". You may also be able to disable the auto-reset by connecting a 110 ohm resistor from 5V to the reset line; see this forum thread for details.

November 01, 2008, at 05:42 PM by David A. Mellis -
Changed lines 84-85 from:

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 (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.

to:

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 (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. The RX and TX LEDs on the board will flash when data is being transmitted via the FTDI chip and USB connection to the computer (but not for serial communication on pins 0 and 1).

October 20, 2008, at 12:19 PM by David Cuartielles -
Changed line 116 from:

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 Δ, OGG Δ, MP3 Δ, FLAC Δ, WMA Δ

to:

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, OGG, MP3, FLAC, WMA

October 20, 2008, at 12:18 PM by David Cuartielles -
Changed line 116 from:

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 Δ, OGG Δ, MP3 Δ, FLAC Δ, WMA Δ

to:

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 Δ, OGG Δ, MP3 Δ, FLAC Δ, WMA Δ

October 20, 2008, at 12:17 PM by David Cuartielles -
Changed line 116 from:

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, OGG Δ, MP3, FLAC Δ, WMA Δ

to:

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 Δ, OGG Δ, MP3 Δ, FLAC Δ, WMA Δ

October 20, 2008, at 12:11 PM by David Cuartielles -
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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.

to:

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, OGG Δ, MP3, FLAC Δ, WMA Δ

October 19, 2008, at 03:17 PM by David A. Mellis -
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Input Voltage (recommended)6-12V
Input Voltage (limits)7-20V
to:
Input Voltage (recommended)7-12V
Input Voltage (limits)6-20V
October 19, 2008, at 03:16 PM by David A. Mellis -
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Input Voltage 
to:
Input Voltage (recommended)6-12V
Input Voltage (limits)7-20V
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The board can operate on an external supply of xx to xx 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 xx, the voltage regulator may overheat and damage the board. The recommended range is xx to xx volts.

to:

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.

October 19, 2008, at 03:15 PM by David A. Mellis -
Changed lines 103-104 from:

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.

to:

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".

October 19, 2008, at 02:25 PM by David A. Mellis -
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to:
October 16, 2008, at 09:24 PM by David A. Mellis -
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The Arduino Duemilanove is a microcontroller board based on the ATmega168 (datasheet). 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.

to:

The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 (datasheet). 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.

October 16, 2008, at 09:23 PM by David A. Mellis -
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A SoftwareSerial library allows for serial communication on any of the Diecimila's digital pins.

to:

A SoftwareSerial library allows for serial communication on any of the Duemilanove's digital pins.

October 16, 2008, at 09:22 PM by David A. Mellis -
Added lines 1-111:

Arduino Duemilanove

Overview

The Arduino Duemilanove is a microcontroller board based on the ATmega168 (datasheet). 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.

Schematic & Reference Design

EAGLE files: arduino-duemilanove-reference-design.zip

Schematic: arduino-duemilanove-schematic.pdf

Summary

MicrocontrollerATmega168
Operating Voltage5V
Input Voltage 
Digital I/O Pins14 (of which 6 provide PWM output)
Analog Input Pins6
DC Current per I/O Pin40 mA
DC Current for 3.3V Pin50 mA
Flash Memory16 KB (of which 2 KB used by bootloader)
SRAM1 KB
EEPROM512 bytes
Clock Speed16 MHz

Power

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 xx to xx 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 xx, the voltage regulator may overheat and damage the board. The recommended range is xx to xx volts.

The power pins are as follows:

  • VIN. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.

  • 5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.

  • 3V3. A 3.3 volt supply generated by the on-board FTDI chip. Maximum current draw is 50 mA.

  • GND. Ground pins.

Memory

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).

Input and Output

Each of the 14 digital pins on the Duemilanove can be used as an input or output, using pinMode(), digitalWrite(), and 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:

  • Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip.

  • External Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.

  • PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.

  • SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.

  • LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.

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:

  • I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the Wiring website).

There are a couple of other pins on the board:

  • AREF. Reference voltage for the analog inputs. Used with analogReference().

  • Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

See also the mapping between Arduino pins and ATmega168 ports.

Communication

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 (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 allows for serial communication on any of the Diecimila'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 for details. To use the SPI communication, please see the ATmega168 datasheet.

Programming

The Arduino Duemilanove can be programmed with the Arduino software (download). For details, see the reference and tutorials.

The ATmega168 on the Arduino Duemilanove comes preburned with a 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, C header files).

You can also bypass the bootloader and program the ATmega168 through the ICSP (In-Circuit Serial Programming) header; see these instructions 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.

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.

Physical Characteristics

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.

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