kdun0001:
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??
What other components are you using? 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.