Dave, I am not using "parasitic power" and I understand the convenience to use a single bus for all three devices. But the failure in using "search rom" and "match rom" command, along with my strong desire to see the project working and so many unused pins on my mcu brought me to the conclusion to choose the simpler way and get the project working.

Now that everything seems working as per my need, I could try to modify the way of reading the DS18B20, but need some help. I need a code snippet that shows How to use properly the search rom and the match rom comand.

So If anybody can help me in understanding, How to use these two commands I will be gratefull, since I got sick for the number of Times I have read the device data sheet.

So again thank you for any help given.

Alberto