Shadows in unity 3d

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i am working in unity 3d.

I have to make shadow for a character controller.

I tried to make it and changed to hard shadows.

But shadows are not visible.

please help me to make shadows.

Thanks in Advance.

Shadow projection is only available in Unity Pro.
If your character is always walking on a flat surface though you can fake it with a 20% alpha black texture as a child object of your character.
If you ARE using Unity Pro, check the rendering path on your camera. you can find more info here:
http://docs.unity3d.com/Documentation/Manual/RenderingPaths.html