after searching the net and emailing the geeetech people i managed from 2000 informations ans a lot of trial and error (a lot) to make my sensor working. the problem was that the manual they put together is not very will explained (some times not at all) so i modified it and i will upload it here and send it to them in hope that others will not scratch their heads and scream like i did because it is not working. and i am electronically challenged so please appreciate and dont make fun if it sounds easy to you ;)