A000133 Datasheet A000133 | P4-P6

On the Arduino Uno Wi-Fi there’s a SC16IS750IBS IO Expander Single UART with

I2C-bus/SPI interface that allows the communication between AtMega 16u2, AtMega

328p and the ESP8266EX.

The Arduino Uno Wi-Fi allow you to communicate via Wi-Fi with your sensors or

actuators mounted on your board to create easily and quickly your IoT System. You

can use your Arduino Uno Wi-Fi as a client of your Wi-Fi network, as a server to

connect other client devices or you can create an ad’hoc Wi-Fi connection.

The perfect way to communicate to internet via your Arduino Uno Wi-Fi is the Ciao

Library and using, for example, the REST connector.

On the Arduino Uno Wi-Fi is pre-uploaded the RestServer sketch that allows you to

command immediately your board via browser:

Connect to the Arduino Uno Wi-Fi SSID and go to the link http://192.168.240.1/arduino/digital/13/1

to turn ON the LED L

Here other possible commands:

* "/arduino/digital/13" -> digitalRead(13)

* "/arduino/digital/13/1" -> digitalWrite(13, HIGH)

* "/arduino/analog/2/123" -> analogWrite(2, 123)

* "/arduino/analog/2" -> analogRead(2)

* "/arduino/mode/13/input" -> pinMode(13, INPUT)

* "/arduino/mode/13/output" -> pinMode(13, OUTPUT)

Programming

The Arduino Uno Wi-Fi can be programmed as a classic Arduino Uno with the Arduino software

(download). Select "Arduino Uno Wi-Fi from the Tools > Board menu (according to the

microcontroller on your board.

The new features of the Arduino Uno Wi-Fi allow you to upload your sketch via Wi-Fi

(in the same way of Arduino Yun), without any wired connection to your PC and your

board.

The ATmega328 on the Arduino Uno Wi-Fi comes pre-burned 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.

Automatic (Software) Reset

Rather than requiring a physical press of the reset button before an upload, the

Arduino Uno Wi-Fi 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 WiFi 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 WiFi 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 Wi-Fi 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 Wi-Fi 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.

P1-P3 P4-P6 P7-P7

A000133

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Arduino

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WiFi Development Tools (802.11) Arduino Uno WiFi

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