maybe for higher distances a 48v is better... or 24v (maybe a industrial
standard voltage)
2011/3/21 Pascal Baerten <pascal.baer...@gmail.com>
> 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
>>
>>
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>
>
> --
> Pascal
> www.brain4home.eu
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>
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