Ty Heckler for the reply, but the link that you gave me my friend doesn't work. Stuck in loading... I deleted comments for posting on site i have done them properly :P :P

My problem is the presence pulse, i can't understand how it works even i have read the datasheet hundrend of times.

I do low for initialise, i do get a low and going for the converting procedure. But i never get the busy bit back, even i did it with 2 diffrent ways.

I suspect that the problem is the presence pulse but i dont know how to check it and that's why i came with a post (i also have read a couple of other threads but still no luck) .