Comments on: DTMF detector for home automation

By: ankush

ankush — Sun, 25 Jun 2006 04:13:58 +0000

the site is down i believe. i have tried for the past two days to view it. could someone who’s seen the site answer me: this device decodes the tones into their digits, but how does the output work? serial port connection or what? i am just too curious to wait for the site to get fixed!

By: dylan willemsa

dylan willemsa — Sat, 17 Jun 2006 18:53:03 +0000

doot bleep beep doot…blam

By: trebuchet03

trebuchet03 — Sat, 17 Jun 2006 04:24:58 +0000

andy

I know its a bit late… but show me where censorship from one media has prevented something from happening. Information has saved more fingers, arms, legs and lives than censorship ever will (sometimes with a side effect of bigger ego’s and superiority complex – just ask why the programming community won’t unionize :p).

Lets stop selling pens because some kid 12 year old killed his parent in his sleep by jamming it into his ear (ya, that actually happened not too far away).

There’s a reason busses are in operation, plane’s are flying and we post information in public domain… WE are not fueled by fear and WE will not let someone else steal our security.

its time to adjust your tinfoil hat ;)

By: strider_mt2k

strider_mt2k — Fri, 16 Jun 2006 16:21:03 +0000

jarechiga, google “phone phreaking”
People used to(?) scam pay phones by reproducing the tones created when the coins registered in the pay phone.
I know those folks could make the tones, _somebody_ has to have info into detecting those tones as well.

Praise knowledge
Praise wisdom

By: jarechiga

jarechiga — Fri, 16 Jun 2006 00:08:18 +0000

You can try the MT8870 it does not require any code from the uControler, it just passes the decoded signals as they come in.

Am using it in a payphone system to detect the dialed number, am just having trouble finding a way to detect my coins, if u have any ideas i will be checking this post.

By: werejag

werejag — Thu, 15 Jun 2006 22:59:43 +0000

Andy

how about you stop being a moron. we will not censor ourself becuase you have a half backed idea on what an ied is.

cell phones, simple radios, wires are common trigger devices and i will not censor that info either.

I just think that it would be prudent to watch what you say andy. Like I said we might be right next to you waiting to DTMF hurt you.

praise allah
praise jesus
praise knowledge

By: werejag

werejag — Thu, 15 Jun 2006 22:54:52 +0000

Andy

how about you stop being a moron. we will not censor ourself becuase you have a half backed idea on what an ied is.

cell phones, simple radios, wires are common trigger devices and i will not censor that info either.

I just think that it would be prudent to watch what you say andy. Like I said we might be right next to you waiting to DTMF hurt you.

praise allah
praise jesus
praise knowledge

By: strider_mt2k

strider_mt2k — Thu, 15 Jun 2006 05:58:34 +0000

andy

Yes let’s limit information on the chance that someone will use it for evil.

Better not discuss rocks either since someone might pick one up and bash your misguided brain out with one.

Let the geology web sites know about that!

Anyone that desires liberty and security deserves neither. -Ben franklin.

-Not to mention that this stuff has been common knowledge since DTMF was developed, so please for the love of ghod _try_ to have a clue what you are talking about before you embarass yourself making dumb statements like you did right there.

By: bogphanny

bogphanny — Thu, 15 Jun 2006 03:49:38 +0000

“I was startled to see the dtmf walk through cause this is what terroists use to initiate there IEDs that are killing so many soldiers in Iraq.”

And with a comment like that, I’m sure you have just inspired a few more…

By: Scienceprog

Scienceprog — Thu, 15 Jun 2006 01:57:07 +0000

Site is ON again. Thanks God i have made a backup yesterday.

By: Scienceprog

Scienceprog — Thu, 15 Jun 2006 01:49:25 +0000

Sorry guys. My web-page database crashed. Good news I have backup. Little bit of patience and site will be on again.
Sorry for this.

By: Nanners

Nanners — Thu, 15 Jun 2006 01:27:08 +0000

The link to this article appears to have gone dead, do any mirrors exist for it?

By: dylan willemsa

dylan willemsa — Thu, 15 Jun 2006 00:09:03 +0000

ooh, snap

By: Andy

Andy — Wed, 14 Jun 2006 20:51:17 +0000

Hey guys I love your site, and Im well aware that the internet is a global source for information, I was startled to see the dtmf walk through cause this is what terroists use to initiate there IEDs that are killing so many soldiers in Iraq. I just think that it would be prudent to watch what yall put on yalls web site. Like I said I love yalls site, but this one just got me being as how I have to work with these almost everyday. Thanks

By: nullset

nullset — Wed, 14 Jun 2006 16:49:51 +0000

For information on doing DTMF/other tone detection efficiently, look up the Goertzel algorithm. Linky:
http://www.embedded.com/showArticle.jhtml?articleID=9900722