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'[PICLIST] [OT] Cheap wireless modules (like Oregon'
2001\04\17@151908 by Rick Mann

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Hi. I have a couple of Oregon Scientific weather monitors. These devices
display the current temperature on up to three remote sensor units. They
operate on 433 MHz wireless, have a range on the order of 100 ft, and are
inexpensive (a remote module costs about $25 retail).

Does anyone know what they use for the communications? I'd like to gather
data from little devices spread throughout my house, and think this might be
an ideal way to transmit it.

TIA,

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Roderick Mann               rmann @ latencyzero.com.sansspam

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2001\04\17@180615 by Barry Gershenfeld

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I have the same devices.  I also thought of asking the same question.
If no one writes in, and no one is brave enough to take theirs
apart maybe I'll have to do the deed sometime.

Barry


At 12:17 PM 4/17/01 -0700, you wrote:
{Quote hidden}

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2001\04\17@200448 by Rick Mann

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on 4/17/01 2:58 PM, Barry Gershenfeld at spam_OUTbarryTakeThisOuTspamZMICRO.COM wrote:

> I have the same devices.  I also thought of asking the same question.
> If no one writes in, and no one is brave enough to take theirs
> apart maybe I'll have to do the deed sometime.

I actually did take mine apart, to no avail. I could not determine by
looking at the tiny hardware inside what they used. It almost seemed like
they have a uP with the functionality built-in.

------------------------------------------------------------
Roderick Mann               rmann @ latencyzero.com.sansspam

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commercial email.

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2001\04\17@202608 by Bill Westfield

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   > I have the same devices.  I also thought of asking the same question.
   > If no one writes in, and no one is brave enough to take theirs
   > apart maybe I'll have to do the deed sometime.

   I actually did take mine apart, to no avail. I could not determine by
   looking at the tiny hardware inside what they used. It almost seemed like
   they have a uP with the functionality built-in.

Sounds similar to the assorted (cheap, probably hackable) X10 wireless
transmitters.  They have one that connects to a db9 serial port (and
essentially fits in a DB9 shell) and sends info to a receiver that does the
on/off stuff for the full complement of X10 (powerline) receivers (so it's
probably got at least one byte worth of transmitted data?)

These are presumably FM-modulated (by digital signal) simple oscillators - I
remember seeing an supposed video modulator using nothing other than a 7407
(hex inverter) cleverly connected to appropriate caps and resistors, and
I've heard you can fiddle with things like high-pass filters and an antenna
on your clock oscillator if your transmit frequency is an appropriate
harmonic of your clock frequency...

BillW

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2001\04\18@004713 by Damon Hopkins

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inside my X10 keychain remote is a PTC2221-001.. I have another remote
w/ a PIC of some type in it I also have 2 other remotes that I haven't
taken apart on the receiver end I couldn't say what's in there but there
are quite a few specs on the CM-17 (the DB9 serial -> wireless unit) as
well a more at the ftp.x10.com site in the instructions and manuals
sections as well as a bunch of modification sites on the web.. I can dig
a few up if any one is interested. I've been looking for a way in use my
PIC's w/ my MisterHouse X10 home automation stuff :)

               Damon Hopkins

William Chops Westfield wrote:
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2001\04\18@124655 by Damon Hopkins

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I've also seen something in Circuit Cellar for something like $5 each
for the receiver and transmitter.. here it is
http://www.laipac.com/msg5.htm

               Damon Hopkins

Rick Mann wrote:
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