Arduino YUN Rev 2

The Arduino YUN Rev 2 has built in ethernet and Wifi Support with the familiar UNO form factor.

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The Arduino Yun Rev 2 is what you're looking for if you want an Arduino board that has built in wifi and ethernet capabilities. Based on the ATmega32u4 and the Atheros AR9331 which supports OpenWrt-Yun, a Linux distribution based on OpenWrt. The YUN compared to the more popular UNO R3 has built-in Ethernet and WiFi support, micro-SD card slot, 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs) in addition to a USB port, a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a 3 reset buttons.

Specifications:

Microcontroller	ATmega32u4
Operating Voltage	5V
Input Voltage	5V
Digital I/O Pins	20
PWM Channels	7
Analog Input Channels	12
DC Current per I/O Pin	40 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	32 KB (of which 4 KB used by bootloader)
SRAM	2.5 KB
EEPROM	1 KB
Clock Speed	16 MHz
Linux microprocessor
Processor	Atheros AR9331
Architecture	MIPS @400MHz
Operating Voltage	3.3V
Ethernet	IEEE 802.3 10/100Mbit/s
WiFi	IEEE 802.11b/g/n
USB Type-A	2.0 Host
Card Reader	Micro-SD
RAM	64 MB DDR2
Flash Memory	16 MB
PoE compatible 802.3af card support (see the note below)
Length	73 mm
Width	53 mm
Weight	32 g

LininoOS
- Software stack updated to OpenWRT latest version, including all patches
- SSL support on the bridge Arduino / Linux bridge
LEDs
- ON (green): indicates that the shield is properly powered
- WLAN (blue): indicates a connection to a wireless network
- WAN (red): indicates connection to ethernet
- USB (white) : indicates system activity and/or if a USB key is mounted

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