i'have a problem with ardunio. the problem is that when i'm connected with the pc it's working however when connecting it with the 9v battery not all components are functioning. what should i do its is possible to conenct another battery of 9V??
Have you followed the play ground?http://arduino.cc/playground/Learning/9VBatteryAdapter
Do you mean 9V battery as in the rectangle type? Those have extremely low current supply capability. They are not suitable for... well, anything really.