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A000133

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Arduino UNO WiFi
The UNO WiFi board is the Arduino UNO with
integrated WiFi. For beginner and advanced users
alike.
The Arduino UNO WiFi board is based on the ATmega328 and it has an integrated
ESP8266 WiFi Module. If you are starting out with Arduino, or starting with IoT, this is
the board to get.
Power
The Arduino Uno Wi-Fi 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
1 A (according to the power input source).
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 supplies.
Memory
The ATmega328 has 32 KB Flash (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 specialised 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. NOTE: the A4 or SDA pin and A5 or SCL pin are in use by the IO Expander
SC16IS750IBS. 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 Wi-Fi 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.
P1-P3P4-P6P7-P7

A000133

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Buy A000133
Manufacturer:
Arduino
Description:
WiFi Development Tools (802.11) Arduino Uno WiFi
Lifecycle:
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