> From: Laurent FAILLIE <l_fail...@yahoo.com> > Subject: Re: [Owfs-developers] 1-wire Capacitors Question
>> Another thing that helped was adding a 1N5711 Schottky diode and a >> 1.5KE20A-T TVS at each end of the bus (it is driven from the middle). > It's for lightning protection ? If so, did you has close lightning during > those years ? Because I had 2 lightnings that hit very closely and burn > one of my probe. Lightning is rare here, only a few strikes per year. But my sensor bus cables run alongside power cables for both AC and DC pumps and actuators, and near the high voltage DC cables from my PV array to its MPPT controller - which are quite noisy. I've learned to put TVS devices all over my control systems. But I'm not sure local wiring was the source of my "storms" of sensor errors. They would happen in bursts, hundreds in a couple of hours, and then not appear for weeks. I kind of suspect "space weather" - CMEs and geomagnetic storms. Or I live on the edge of a "Military Operations Area", who knows what those government aircraft are doing in there... With the cap and diodes in place, I've seen only ten failed reads all year despite reading one sensor per second. Maybe excessive precision, but some of them control a serious solar hot water system that can overheat quickly if the pumps don't turn on at the right point. > How are they connected ? Thanks The '+' end of each one on the data line, '-' end to ground wire. The last sensor connects to the same terminal block by about one meter of cable. Loren | Loren Amelang | lo...@pacific.net | ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
