Re: Motorola home control

["jibberjabber" <none@xxxxxxxxx>]

Ok, that looks doable without too much trouble.  I'm using BASCOM...sooo
easy

The only reason I looked at Motorola is that I really like the design of
their wireless motion detector.  What's the most reliable and powerful
(hopefully they're not mutually exclusive) wireless X10 motion detector
these days. I have a DM10A but what a huge beast it is.  I only want to use
them for "I'M HOME" determination.

jj,
Do we have some nice weather this week or what!


"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
news:42b29d37.4814646@xxxxxxxxxxxxxxxx
> You have to look for the first non-noise pulse. Some protocols are easier
> than others, using a lead-in pulse that also functions to set the AGC in
> the
> receiver. The NEC protocol used by X-10 is one of the easiest as it has a
> long lead-in but lots of others also have easily distinguishable lead-ins.
>
> Noise pulses tend to be shorter than most data pulses so even protocols
> without a lead-in are fairly easy to handle. And, as you can see from my
> screenshots, the AGC quickly separates the wheat from the chaff, giving
> you
> a fairly clear signal.
>
> Also, the specific RF receiver I mentioned has a linear output which can
> be
> used with an ADC input as an RSSI indicator. The RSSI of random noise will
> be low in comparison to a signal (as long as the signal is stronger than
> the
> random noise. You can use it as a rough Carrier Detect indicator.
>
> The screenshots are a bit misleading in that the RF receiver has automatic
> threshold control which tries to make mountains out of molehills. See...
>
>     http://www.mbx-usa.com/rf-noise.htm
>
> It's actually pretty easy to separate signal and noise as long as the
> signal
> is stronger than the noise.
>
> But, how easy also depends on the specific protocol. I have seen some with
> no lead-in and short data pulse/spaces.
>
> What language do you use with the AVRs? You can probably find example code
> somewhere as this is a frequent application.
>
> BTW, I'm just across the river from cinci - about halfway to CVG.
>
> "jibberjabber" <none@xxxxxxxxx> wrote:
>
>>Thanks, Dave.
>>I've interfaced AVRs to LINX serial radio modules, but never ASK/OOK.  If
>>there is constant radio noise, and therefore constant data coming in, how
>>do
>>you pick out the real data in the stream?
>>jj, cinci
>>
>>
>>"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
>>news:42b57ce5.82022622@xxxxxxxxxxxxxxxx
>>>I have no idea what protocol they use nor whether they use FSK or ASK but
>>> most similar devices use ASK/OOK because it's simplest and lowest cost.
>>>
>>> You can buy a 418MHz ASK receiver from Mouser - PN 509-RCR-418-RP FOR
>>> $4.26.
>>>
>>> The data output will be in the audio range so you can record it as a
>>> .WAV
>>> file using a soundcard line-in (It's IMPORTANT that you use line-in.)
>>> and
>>> view it in almost any Wave editor.
>>>
>>> I have illustrated this at...
>>>
>>>     http://www.mbx-usa.com/learn.htm
>>>
>>> The RF section is about half-way down the page.
>>>
>>> For any final 'server' device, you'll need to interface the RF receiver
>>> with
>>> something that can decode the data output. Unless you have experience in
>>> programming microcontrollers, you'll be better off buying their
>>> 'server'.
>>>
>>> "jibberjabber" <none@xxxxxxxxx> wrote:
>>>
>>>>Motorola is expanding there home automation products:
>>>>http://broadband.motorola.com/consumers/home_monitoring.asp
>>>>
>>>>The spec sheet says the wireless sensors run at 418 mhz.  Anyone know
>>>>what
>>>>it takes to interface with them (type of radio needed, protocol)?...I'd
>>>>really rather not have to buy their "server".
>>>>
>>>>jj
>>>>
>>>
>>
>