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Home Arduino Uno Rev3
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ARDUINO UNO REV3
Code: A000066 / Barcode: 7630049200050
€20,00
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No battery Usb 8 bit AVR 5 V Standard (~20) < 20 mA
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OVERVIEW
Arduino Uno is a microcontroller board based on the ATmega328P (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 (CSTCE16M0V53-R0), 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.. You can tinker with
your Uno without worrying too much about doing something wrong, worst case
scenario you can replace the chip for a few dollars and start over again.
"Uno" means one in Italian and was chosen to mark the release of Arduino
Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were
the reference versions of Arduino, now evolved to newer releases. The Uno board
is the first in a series of USB Arduino boards, and the reference model for the
Arduino platform; for an extensive list of current, past or outdated boards see
the Arduino index of boards.
RELATED BOARDS
If you are interested in boards with similar functionality, at Arduino you can
find:
* Arduino Uno Rev3 SMD
* Arduino Uno WiFi Rev2
GETTING STARTED
The Getting Started with Arduino Uno page contains all the information you need
to configure your board, use the Arduino Software (IDE), and start tinkering
with coding and electronics.
From the Tutorials section you can find examples from libraries and built-in
sketches as well other useful information to expand your knowledge of the
Arduino hardware and software.
Find inspiration for your Uno projects from our tutorial platform Project Hub.
NEED HELP?
Check the Arduino Forum for questions about the Arduino Language, or how to make
your own Projects with Arduino. Need any help with your board please get in
touch with the official Arduino User Support as explained in our Contact Us
page.
WARRANTY
You can find here your board warranty information.
--------------------------------------------------------------------------------
TECH SPECS
Microcontroller ATmega328P Operating Voltage 5V Input Voltage (recommended)
7-12V Input Voltage (limit) 6-20V Digital I/O Pins 14 (of which 6 provide PWM
output) PWM Digital I/O Pins 6 Analog Input Pins 6 DC Current per I/O Pin 20 mA
DC Current for 3.3V Pin 50 mA Flash Memory 32 KB (ATmega328P) of which 0.5 KB
used by bootloader SRAM 2 KB (ATmega328P) EEPROM 1 KB (ATmega328P) Clock Speed
16 MHz LED_BUILTIN 13 Length 68.6 mm Width 53.4 mm Weight 25 g
DOCUMENTATION
OSH: SCHEMATICS
Arduino Uno is open-source hardware! You can build your own board using the
following files:
EAGLE FILES IN .ZIP SCHEMATICS IN .PDF BOARD SIZE IN .DXFDATASHEET IN .PDF
PINOUT DIAGRAM
Download the full pinout diagram as PDF here.
INTERACTIVE BOARD VIEWER
LEARN MORE
* ARDUINO DOCS For the full technical documentation, tutorials and much more,
visit Arduino Docs
GET INSPIRED
FAQS
PROGRAMMING
The Arduino Uno can be programmed with the (Arduino Software (IDE)). Select
"Arduino Uno from the Tools > Board menu (according to the microcontroller on
your board). For details, see the reference and tutorials.
The ATmega328 on the Arduino Uno comes preprogrammed 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 using Arduino ISP or similar;
see these instructions for details.
The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is
available in the Arduino repository. 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 rese ing 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). See this user-contributed
tutorial for more information.
WARNINGS
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.
DIFFERENCES WITH OTHER BOARDS
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.
POWER
The Arduino Uno board 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 from 6 to 20 volts. If supplied with
less than 7V, however, the 5V pin may supply less than five volts and the board
may become 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 to work with the 5V or 3.3V.
MEMORY
The ATmega328 has 32 KB (with 0.5 KB occupied by 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
See the mapping between Arduino pins and ATmega328P ports. The mapping for the
Atmega8, 168, and 328 is identical.
PIN MAPPING ATmega328P
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 20 mA as recommended operating condition
and has an internal pull-up resistor (disconnected by default) of 20-50k ohm. A
maximum of 40mA is the value that must not be exceeded on any I/O pin to avoid
permanent damage to the microcontroller.
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 driven by digital pin 13. When the pin is
HIGH value, the LED is on, when the pin is LOW, it's off.
* TWI: A4 or SDA pin and A5 or SCL pin. Support TWI communication using the
Wire library.
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. 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 board, 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 (IDE) includes a serial
monitor which allows simple textual data to be sent to and from the 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 serial communication on any of the Uno's digital
pins.
The ATmega328 also supports I2C (TWI) and SPI communication. The Arduino
Software (IDE) includes a Wire library to simplify use of the I2C bus; see
the documentation for details. For SPI communication, use the SPI library.
AUTOMATIC (SOFTWARE) RESET
Rather than requiring a physical press of the reset button before an upload, the
Arduino Uno board 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 (IDE) uses this
capability to allow you to upload code by simply pressing the upload button in
the interface toolbar. 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 board 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.
REVISIONS
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.
ARDUINO UNO REV3
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No battery Usb 8 bit AVR 5 V Standard (~20) < 20 mA
The Arduino UNO is the best board to get started with electronics and coding. If
this is your first experience tinkering with the platform, the UNO is the most
robust board you can start playing with. The UNO is the most used and documented
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