jureivis:
Ok now it make sensethe only way is to rewrite the program to read 5 x DS18B20.
Honestly - is it doable for newbie? or should i better go back to a guy who wrote the original program and ask him to change it?
If you stopped being so secretive about this pre-programmed device, you might save yourself a bit of grief. Unless you won it in a side-show and are just wondering now what to do with it, there must surely be some information about it that prompted you to get in the first place, and yet you won't even tell anybody about that.
It is very likely that, if this mysterious device is pre-programmed to use the DS18B20, it will be capable of using several. In that case, you are good to go, no re-programming required. If not, try the programmer but who would know what your chances are there? A little bit of intelligent communication here instead will probably resolve this matter, one way or the other.
I submit it is more likely that this device isn't pre-programmed at all. It sounds rather like some sort of starter kit that is capable of being programmed "to dim leds, control temperature etc." but, as it comes out of the box, can't actually do anything. In that event, you've got something everybody else can understand, and could be just what you need.
If you can't resolve the matter sensibly, and it really is a single purpose pre-programmed device, you might as well try your luck with leaning five sensors against it, secure in the knowledge that the only alternative is to treat it for what it then probably is - something to be hacked for salvageable parts - parts that will be useful for you start over again. And yes, honestly, it is doable by a newbie. There will be plenty of support for you on this forum.
All you need to know is here: