user3299: I want to open the window to let the cat enter or go out, but the mecanism of the window may me think that the best way should be to use a jack/cylinder (I don't know what term is more appropriate in english for that) to open and close the door.
I will use rfid or another wireless think to know it the cat is in the place and then open the wondow but I want to close the window and let the wndow close event if there is little bit of wind, so I need domething robust.
Do you know a good hardware with (this would be the best) piece of code that can help me for that?
Thanks in advance

user630: Check out this instructable - for opening a window for a cat :)
The guy used a servo, Towerpro MG995 with 10 kg torque for opening/closing the window, and a 10cm distance sensor for sensing the cat (he used Pololu Carrier with Sharp GP2Y0D810Z0F Digital Distance Sensor, but I believe that any proximity sensor will do). 
This is a pictrure of the mechanism, seems quite robust:


3299: <p>I want to open the window to let the cat enter or go out, but the mecanism of the window may me think that the best way should be to use a jack/cylinder (I don't know what term is more appropriate in english for that) to open and close the door.</p>

<p>I will use rfid or another wireless think to know it the cat is in the place and then open the wondow but I want to close the window and let the wndow close event if there is little bit of wind, so I need domething robust.</p>

<p>Do you know a good hardware with (this would be the best) piece of code that can help me for that?</p>

<p>Thanks in advance</p>
 630: <p>Check out <a href="http://www.instructables.com/id/Arduino-controlled-window-for-cat/" rel="nofollow noreferrer">this instructable</a> - for opening a window for a cat :)
The guy used a servo, <a href="http://www.servodatabase.com/servo/towerpro/mg995" rel="nofollow noreferrer">Towerpro MG995</a> with 10 kg torque for opening/closing the window, and a 10cm distance sensor for sensing the cat (he used <a href="http://www.pololu.com/product/1134" rel="nofollow noreferrer">Pololu Carrier with Sharp GP2Y0D810Z0F Digital Distance Sensor</a>, but I believe that any proximity sensor will do). </p>

<p>This is a pictrure of the mechanism, seems quite robust:
<img src="https://i.stack.imgur.com/RT0EL.jpg" alt="enter image description here"></p>
