The Arduino Yún is a microcontroller board based on the ATmega32u4 (datasheet) and the Atheros AR9331.
The Atheros processor supports a Linux distribution based on OpenWRT named Linino. The board has built-in
Ethernet and WiFisupport, a USB-A port, micro-SD card slot, 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a 3 reset buttons.
NB : In some countries, it is prohibited to sell WiFi enabled devices without government approval. While waiting for proper certification,
some local distributors are disabling WiFi functionality. Check with your dealer before purchasing a Yún if you believe you may live in such a country. If you wish to disable WiFi, run this sketch. For more information, refer to this forum post.
|Digital I/O Pins||20|
|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)|
|Ethernet||IEEE 802.3 10/100Mbit/s|
|USB Type-A||2.0 Host/Device|
|Card Reader||Micro-SD only|
|Flash Memory||16 MB|
|compatible 802.3af card support (see the note below)|