I have got a RaspberryPi powered by a 5V 2A power supply. The Raspberry Pi has got a wifi dongle that works perfectly. Also I have got an Arduino connected to the Pi by USB (Raspberry USB port to Arduino USB input). This configuration works ok, the Arduino is recognized by the Raspberry Pi without problem (I see it using lsub).
The problem comes when I connect one servo (http://www.servodatabase.com/servo/towerpro/sg90) to the Arduino. The servo is powered by the 5V pin of the Arduino (there is not other supply).
When I do that the wifi goes down and it is disconnected from the WAN.
What is the problem here?
The Raspberry USB port does not provide enough power?