So I can use the first resistor I will find in my lab, that's good.
Yes, to do calculations with the raw value was my first target but when I encountered this "reading obstacles" I got stopped...
Mmm i don't think that there are ways (in this case) to know if it's all ok, but I've understood the hint, thanks!
This evening when I return home I will do some try.
The sensor seems to work properly even with 12 V, but maybe not full range... The try that I can do is to power all the system with something like 15V.... Arduino can support it? (I read that max is 12V, but it can work even with 20V)
P.S.: little job dome with arduino:
P.P.S.: sorry for my english, I only studied it in high school!