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:
>
>     > 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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