Im going to put 3 DS1820 on approx 30 meter of PDS Wire
I have read in
Dallas Application Note 148
Guidelines for Reliable 1-Wire Networks
And it seems that they think the "just a pullup to +5v" is for Short Network diameters (Cable lengths).
I was thinking about building the example with the FET , but wanted to hear if anyone here has experience in running 30 mtr (100 feet) using just the pullup.
Btw i am wondering why there is no termination in the "far end" , but guess that Dallas knows best.