Re: Reading Wireless Temp

[nobody@xxxxxxxxxxxx (Dave Houston)]

Neither will do what you want at this time. You need to know the protocol
and there are just too many proprietary protocols to try to tackle reverse
engineering all of them.

These are popular enough that it might be worthwhile to look into them but I
don't have time right now. A lot are made by the same company but just have
different brand names so if you get a protocol for one you have it for all.
I think this may be one that uses the protocol for which Don Lancaster
published details.

     http://www.tinaja.com/glib/muse151.pdf

I've designed a DIY generic module that can be used to build RF receiver
modules. It would just require the right receiver board (i.e. frequency) and
a PIC that was designed to decode this specific protocol. I'll look into it
after I get roZetta released.

What I'll try to do is program a PIC to output the pertinent data in human
readable form so that roZetta doesn't need to know the details. If you have
the receiver on port P2, you'll see something like "HH:MM:SS P2 ID 76°F"
where ID identifies a specific sensor and you can program whatever action
you wish as a response. It this way it could also be used with the ZX24-AHT
once I port that code to the ZX-24 chip.

You can buy a $5 RF receiver from Mouser and connect it to a soundcard using
a really simple circuit. You can then record the protocol as a .WAV file and
dissect it with a .WAV editor. I've written some software that will capture
codes and automatically convert them to CCF format for analysis. I'll try to
make it available after roZetta is ready.

svorres@xxxxxxxx wrote:

>I have a number of Wireless temperature sensors around the house.
>
>They are Oregon Scientifics standard sensors  i.e THC-138.  I think
>they drive a 433 Mhz ASK format.
>
>Are  there any docs on the protocol I can read ?
>
>Is there a way I can read the data into an Ocelot into HAL2000 ?
>
>I suspect an BX-24AHT or RoZetta Hardware may be able to accomplish
>this, but I'm not certain if the sufftware supports the temp sensors.