Thanks everybody

Actually my sensor has analog o/p.

It is basically light-to-frequency converter.

By using these sensors I am sensing objects to differentiate their color.

The three sensors gives me R,G,B respectively.

Processing these RGB values gives me exact color of the object.

Now for fast processing I should get RGB at one go and my system is based on trigger.As mentioned earlier when trigger comes a interrupt is generated and after predefined time R channel reads the object.After another predefined time I am reading G chaneel and so on.So after reading RGB then only I could process these values.Time taken to read object by each channel is 8msec.My conveyvor speed is 420mm/sec , dist betwn my objects is 4mm and objects have avg. size of 15mmx7mmx4mm(lxbxh).

Thanks again,

D