Your problem is probably the GND wire which is too weak and is pulled up when the low impedance relay is activated. installing a 220µF capacitor between GND and +5V of the relay supply and a 100nF between GND and chip supply may reduce variations during transitions but cannot prevent a GND pulled up.
You may want to use two or three wires to connect ground along the bus. also chosing a separate supply for the relay is a good idea, but why not opting for 12v supply ? this allow to transport more power over long distance with less drop and 12v relay coils are higher impedance... Pascal 2011/3/20 Mick Sulley <m...@sulley.info> > Hi, > > I have expanded my network to about 20 DS18?20's and all was fine. I am > now trying to add some I/O using Embedded Data Systems D2P modules which use > DS2406. I need to switch mains voltage so built circuits to switch relays > with the D2P units. > > The network is basically Cat 5 cable with some spurs off in 4 core phone > cable. I had some concerns over power requirements a while back and decided > to use 2 separate 5v power supplies, one for the sensor circuit and one for > the relay circuits. > > I added one of the D2P units and it seemed OK, I then added a couple more > and the network crashes. Using owfs and looking at the directory structure > I see various things, maybe no devices at all then refresh and see a couple > of the temperature devices, refresh again and see nothing, etc. > > The D2P unit that caused the crash was at the far end of the network, I > unplugged it and plugged it in half way down and it worked. I put it back > at the end and unplugged the relay +5v supply and it works (but obviously > the relays don't work). Not sure if this diagram will get through, the > circuit I have used is - > > > > > I am really stuck here, I don't know what to do next. Can anyone help > please? > Thanks > Mick > > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > -- Pascal www.brain4home.eu to subscribe, send a mail to <list-subscr...@brain4home.eu>
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