On Dec 6, 2007 4:32 PM, Decibels <[EMAIL PROTECTED]> wrote: > > That is good news, so will be able to run in parasitic mode on DS18S20 thru > the DS2409 Hub, if I understand you correctly. I am still going to run in > powered for now, but good news for the future. > Not sure that would have corrected my problem or not with the Vdd floating. >
Just a quick note: In our lab, we found the 18S20's were painfully slow in parisitic mode. We ended up switching to the 18B20, which is a drop-in replacement for the 18S20, but MUCH, MUCH faster and in general, more stable. I strongly recommend: 1) don't buy any more S20's, buy only 18B20's 2) Always run S20's in powered mode. (18B20's are fine in either mode). Just for some comparison info: I currently have a network of 10 18B20's in paricitic mode from a USB adaptor, and found that it takes about 11 seconds to read the full resolution temperature from all of them in sequence. (Using the symultanous then reading the temps didn't go any faster like I thought). --Jim School of EECS, WSU SmartHome Project ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
