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It has been a while since I have worked with them and I should probably go look at some code first, but.....They don't have a "specific digital address" per se, they have a unique ID which you can read. You do not have to make use of it, however, to read the temperature. So, if you only have one sensor, there is no reason to mess with the ID...and I would guess that is what they are doing with the product that you bought.
So, no easy way to switch between device except by using hardware (not sure how smoothly that would go and I never tried it), if you wanted to stay with that device. If you write your own software, or use an existing software library, you could put together your own system fairly easy - see the billions of Arduino examples out there
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Yes, I did have a system I put together that monitored 12 chest freezers, it worked great. I will say the wiring part was easy for me but the computer program install and setup was tedious for me. I liked the program I used because It had a large display and would change from white numbers to red at any preset temp as a warning. But it was not easy for me to setup. Every morning when I hit the computer mouse, I could see if any freezer was malfunctioning, before any damage was done.
I just wanted a simple instrument to monitor the temperature stratification of the air in my sauna. If I could just mount a 6 position switch and switch between sensors, that are mounted at different heights in the sauna that would be great.
Hmm, while looking for something else the other day I ran across a package of LM35s.