500143 Arduino UNO R3 con microcontrollore ATmega328

Arduino UNO R3 con microcontrollore ATmega328

This is the new Arduino Uno R3. In addition to all the features of the previous board, the Uno now uses an ATmega16U2 instead of the 8U2 found on the Uno
Categories
Prices are VAT included
€21.11 Price
€17.30 + VAT

 

Details

The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, 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.
The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.
Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.
Revision 3 of the board has the following new features:
  • 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
  • Stronger RESET circuit.
  • Atmega 16U2 replace the 8U2.
"Uno" means one in Italian and is named to mark the upcoming release of Arduino 1.0. The Uno and version 1.0 will be the reference versions of Arduino, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform.

 

 

Summary

 

 

Microcontroller

ATmega328

Operating Voltage

5V

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

32 KB (ATmega328) of which 0.5 KB used by bootloader

SRAM

2 KB (ATmega328)

EEPROM

1 KB (ATmega328)

Clock Speed

16 MHz

Length

68.6 mm

Width

53.4 mm

Weight

25 g

 

 

Schematic & Reference Design

 

 

EAGLE files: arduino-uno-Rev3-reference-design.zip (NOTE: works with Eagle 6.0 and newer)
Note: The Arduino reference design can use an Atmega8, 168, or 328, Current models use an ATmega328, but an Atmega8 is shown in the schematic for reference. The pin configuration is identical on all three processors.

 

 

Power

 

 

The Arduino Uno 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:
  • 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.This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.
  • 3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.
  • GND. Ground pins.
  • IOREF. This pin on the Arduino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V.

 

 

Memory

 

 

The ATmega328 has 32 KB (with 0.5 KB used for the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

 

 

 

Input and Output

 

 

Each of the 14 digital pins on the Uno 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 ATmega8U2 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 using the SPI library.
  • 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 Uno has 6 analog inputs, labeled A0 through A5, 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:
  • TWI: A4 or SDA pin and A5 or SCL pin. Support 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.

 

 

Communication

 

 

The Arduino Uno has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega328 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). An ATmega16U2 on the board channels this serial communication over USB and appears as a virtual com port to software on the computer. The '16U2 firmware uses the standard USB COM drivers, and no external driver is needed. However, on Windows, a .inf file is required. 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 USB-to-serial 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 Uno's digital pins.
The ATmega328 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; For SPI communication, use the SPI library.

 

 

Programming

 

 

The Arduino Uno can be programmed with the Arduino software (download). Select "Arduino Uno from the Tools > Board menu (according to the microcontroller on your board
The ATmega328 on the Arduino Uno 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.
You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using Arduino ISP or similar.
The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available. The ATmega16U2/8U2 is loaded with a DFU bootloader, which can be activated by:
  • On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2.
  • On Rev2 or later boards: there is a resistor that pulling the 8U2/16U2 HWB line to ground, making it easier to put into DFU mode.
You can then use Atmel's FLIP software (Windows) or the DFU programmer (Mac OS X and Linux) to load a new firmware. Or you can use the ISP header with an external programmer (overwriting the DFU bootloader). 

 

 

Automatic (Software) Reset

 

 

Rather than requiring a physical press of the reset button before an upload, the Arduino Uno 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 ATmega8U2/16U2 is connected to the reset line of the 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 Uno 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 Uno. 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 Uno 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.

 

 

USB Overcurrent Protection

 

The Arduino Uno 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 Uno PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Four 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.

Specifications

Part. No. : A000066

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.

Questions on Arduino UNO R3 con microcontrollore ATmega328

No questions asked yet

Register or Login to ask a question.
Register or Login to ask a question.
  1. Cavo USB 2.0 tip A-B 1.8mt

    333368 Cavo USB 2.0 tip A-B 1.8mt

    Cavetto USB versione 2.0
    Excl. Tax:
    €2.92
    Incl. Tax:
    €3.56
      Compare
  2. ATmega328 with Arduino Optiboot (Uno)

    710524 ATmega328 with Arduino Optiboot (Uno)

    ATmega328 in DIP package, pre-loaded with the Arduino Optiboot (Uno 16MHz) Bootloader. This will allow you to use Arduino codfalse
    Excl. Tax:
    €5.22
    Incl. Tax:
    €6.37
      Compare
  3. 20 in 1 basic components kit

    115003 20 in 1 basic components kit

    Most common used electronic components pack.
    Excl. Tax:
    €4.26
    Incl. Tax:
    €5.20
      Compare
  4. Power Supply 3-12V 600mA

    802431 Power Supply 3-12V 600mA

    Power-saving stabilized power supply. Selectable output: 3-12V. 600mA
    Excl. Tax:
    €12.00
    Incl. Tax:
    €14.64
      Compare
  5. Luigino328 PROTOTYPE

    990023P Luigino328 PROTOTYPE

    Luigino328 is an Arduino Compatible board. It runs all the applications made for Arduino, it has the same form factor, it is false
    Excl. Tax:
    €16.60
    Incl. Tax:
    €20.25
      Compare
  6. Arduino Starter kit - English

    802463 Arduino Starter kit - English

    The most common and useful electronic components with a selection of 15 projects that start from a low complexity, in order tfalse
    Excl. Tax:
    €74.12
    Incl. Tax:
    €90.43
      Compare
  7. Arduino Stackable Header Kit - R3

    711417 Arduino Stackable Header Kit - R3

    These headers are made to work with the Arduino Uno R3, Leonardo and new Arduino boards going forward.
    Excl. Tax:
    €1.88
    Incl. Tax:
    €2.29
      Compare
  8. Starter Shield EN(Tick Tock shield) v2

    808898 Starter Shield EN(Tick Tock shield) v2

    By playing with it, you can literally learn some basic skills that are required to be a maker, like soldering techniques, basfalse
    Excl. Tax:
    €12.99
    Incl. Tax:
    €15.85
      Compare
  9. DFRduino UNO R3 - Arduino Compatible

    120216 DFRduino UNO R3 - Arduino Compatible

    Microcontroller board fully compatible with Arduino UNO R3 and Arduino IDE open-source development environment.
    Excl. Tax:
    €15.50
    Incl. Tax:
    €18.91
      Compare
  10. WhatsNext - Yellow (Arduino Uno Compatibile)

    809118 WhatsNext - Yellow (Arduino Uno Compatibile)

    Microcontroller board based on the the ATmega328. Arduino UNO compatible
    Excl. Tax:
    €13.55
    Incl. Tax:
    €16.53
      Compare
  11. SparkFun RedBoard Edge

    714525 SparkFun RedBoard Edge

    Scheda Arduino compatibile, pronta per essere montata a pannello. Ha tutte le caratteristiche della scheda RedBoard con i confalse
    Excl. Tax:
    €16.15
    Incl. Tax:
    €19.70
      Compare
  12. LilyPad Light Sensor

    714629 LilyPad Light Sensor

    Scheda LilyPad con sensore di luce. Il sensore ha un output analogico da 0 a 3.3V.
    Excl. Tax:
    €4.80
    Incl. Tax:
    €5.86
      Compare
  13. SparkFun RedBoard Qwiic

    715123 SparkFun RedBoard Qwiic

    The RedBoard combines the simplicity of the UNO's Optiboot bootloader (which is used in the Pro series), the stability of thefalse
    Excl. Tax:
    €17.47
    Incl. Tax:
    €21.31
      Compare
  14. SparkFun BlackBoard C

    715098 SparkFun BlackBoard C

    The RedBoard combines the simplicity of the UNO's Optiboot bootloader (which is used in the Pro series), the stability of thefalse
    Excl. Tax:
    €20.05
    Incl. Tax:
    €24.46
      Compare
  15. Alimentatore AC/DC 12V 1000mA Plug 5.5 x 2.1mm

    809447 Alimentatore AC/DC 12V 1000mA Plug 5.5 x 2.1mm

    Alimentatore stabilizzato 12V - 1000mA - 100/240VAC
    Excl. Tax:
    €9.50
    Incl. Tax:
    €11.59
      Compare