Remote slave circuit

[Todd Turner-3]

I'm looking at having temp sensors in different locations in the house
using the already existing cat 5e cable.

I'm planning on using a twisted pair for 5V, Gnd, a pair for 1 wire/
Gnd and a pair for the 1 wire / Gnd coming  back from the remote
slave.

I've got a reference for the master side of the circuit but not sure
what to do at the slave.  Do I need any other components at the slave,
or can I get away with just the temp sensor?

Thanks

Todd

Sent from my iPhone

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[Eloy Paris]

Hi Todd,

On 01/10/2012 09:47 PM, Todd Turner wrote:

> I'm looking at having temp sensors in different locations in the house
> using the already existing cat 5e cable.
>
> I'm planning on using a twisted pair for 5V, Gnd, a pair for 1 wire/
> Gnd and a pair for the 1 wire / Gnd coming  back from the remote
> slave.
>
> I've got a reference for the master side of the circuit but not sure
> what to do at the slave.  Do I need any other components at the slave,
> or can I get away with just the temp sensor?

No components are needed on the slave side; the DS18x20 temperature
sensor is enough.

My home 1-Wire network uses my cat5 network infrastructure, and I
connect the DS18B20s just like you describe, although all my sensors are
parasitic powered, i.e. I am not sending 5 volts through one of the
pairs of the cat5 cable.

I use a LinkUSB master, though, so I don't know if you'd have problems
with a homemade master.

Cheers,

Eloy Paris.-

P.S. If you end up going with parasitic power then remember to ground
the Vdd pin on the DS18B20s.

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