user3298: 2 days back I bought Arduino Yun. I'm able to flash Led on 13 pin. And I'm able to flash Led on Bread board connected to A0. I'm able to run linux commands.
Now I want control A0 pin using Linux/Python program. Is this possible? I read many documents. But I didn't find thing related to this.  
How I  can flash the LED using Linux programs?

user7012: There are several libraries which will do this for you. Basically, you should upload a special sketch onto the Arduino, which listens to the serial port, and performs the I/O that the Linux chip requests. Libraries which can do this are

Firmata
Autobahn
LininoIO


3298: <p>2 days back I bought Arduino Yun. I'm able to flash Led on 13 pin. And I'm able to flash Led on Bread board connected to A0. I'm able to run linux commands.</p>

<p>Now I want control A0 pin using Linux/Python program. Is this possible? I read many documents. But I didn't find thing related to this.  </p>

<p><strong>How I  can flash the LED using Linux programs?</strong></p>
 7012: <p>There are several libraries which will do this for you. Basically, you should upload a special sketch onto the Arduino, which listens to the serial port, and performs the I/O that the Linux chip requests. Libraries which can do this are</p>

<ul>
<li><a href="http://arduino.cc/en/Reference/Firmata" rel="nofollow">Firmata</a></li>
<li><a href="http://tavendo.com/blog/post/arduino-yun-with-autobahn/" rel="nofollow">Autobahn</a></li>
<li><a href="http://www.linino.org/" rel="nofollow">LininoIO</a></li>
</ul>
