Author Topic: Cell-phone control with DTMF  (Read 5967 times)

0 Members and 1 Guest are viewing this topic.

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Cell-phone control with DTMF
« on: November 27, 2009, 04:32:29 PM »
Starting a little side project, cell-phone control board that decodes the DTMF signal into binary.
It was surprisingly easy to do and worked the first time. Right now the MP3 player (samsung p3 is so cool) is playing some DTMF tones. In the future there will be a cell phone instead.

RazorConcepts DTMF Decoder using MT8870


Logged

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: Cell-phone control with DTMF
« Reply #1 on: November 28, 2009, 09:03:32 PM »
Logged

Offline Spoil9

  • Robot Overlord
  • ****
  • Posts: 155
  • Helpful? 1
Re: Cell-phone control with DTMF
« Reply #2 on: November 29, 2009, 03:30:33 PM »
Awesome build. But how do you plan to do remote answering and disconnecting of the cell phone? I'm assuming that you would plug this circuit into the ear piece jack on the cell phone?
Logged
Knowledge is Power. Power Corrupts. Study Hard. Be Evil.

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: Cell-phone control with DTMF
« Reply #3 on: November 29, 2009, 03:45:23 PM »
Most cell phones can be set to auto-answer which immediately picks up the incoming call, and will disconnect once the other guy disconnects.
Logged

Offline gaurav.p

  • Robot Overlord
  • ****
  • Posts: 142
  • Helpful? 0
  • Go robotics
Re: Cell-phone control with DTMF
« Reply #4 on: November 30, 2009, 02:46:17 AM »
how did u upload the eagle file like that .........pls tell

-gaurav
Logged
Big Things Come In Small Packages!!!

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: Cell-phone control with DTMF
« Reply #5 on: November 30, 2009, 05:16:22 AM »
I used print-screen and arranged it together in Microsoft Paint.
Logged

Offline TrickyNekro

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 1,207
  • Helpful? 15
  • 1.6L Peugeot 307 tuner
Re: Cell-phone control with DTMF
« Reply #6 on: November 30, 2009, 07:36:32 AM »
Why to control a cell phone with DTMF where you can control it by a simple serial protocol...
I know that new phones have USB and not serial, but still I heard it's easy enough to do it..
you can create calls, sent SMS and so on??? I really think it would be more practical...


Still, every try is for good, and I wish you best of luck!!!
Hope I'm able to help you with anything that comes up!!!


Best Regards, Lefteris
Greece
Logged
For whom the interrupts toll...


P.S. I've been inactive for almost a year... Don't give promises but I'll try to complete my tutorials. I'll let you know when..

Cheers!

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: Cell-phone control with DTMF
« Reply #7 on: November 30, 2009, 05:29:00 PM »
I was aiming this to be a simple thing, plug and play, so forth. So one could hook up a $10 prepaid phone or something and it works right off the bat, no setting up, etc. But that serial thing sounds interesting... but maybe only on more modern phones? I have a Chololate 2 and there is no standard USB connector or anything, either.
Logged

Offline Spoil9

  • Robot Overlord
  • ****
  • Posts: 155
  • Helpful? 1
Re: Cell-phone control with DTMF
« Reply #8 on: December 02, 2009, 09:16:26 PM »
my recent couple phones have had the mini USB port for charging and data transfer but I have yet to find anything relating to how I can tap/ hack into that.
One thing I would like to do is add a second line to my service and keep that phone in my car connected to my security system so that when my alarm goes off I get a SMS txt. But that is way over my head at this point in the game. Maybe one day in the future.
Logged
Knowledge is Power. Power Corrupts. Study Hard. Be Evil.

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: Cell-phone control with DTMF
« Reply #9 on: December 02, 2009, 09:27:17 PM »
And hopefully a future without proprietary connectors!!

Anyways here is the breadboarded circuit, will have to make one minor revision to the schematic and off to BatchPCB it goes...

DTMF V2 RazorConcepts
Logged

Offline Razor ConceptsTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: Cell-phone control with DTMF
« Reply #10 on: December 06, 2009, 12:38:15 AM »
Final version. Placed an order for 2 pcbs from Batchpcb

Logged

Offline Afroman

  • Expert Roboticist
  • Full Member
  • *****
  • Posts: 50
  • Helpful? 4
Re: Cell-phone control with DTMF
« Reply #11 on: December 09, 2009, 12:16:22 AM »
Where are you buying your DTMF decoder ICs from? They are pretty hard to find these days.
Logged

Offline Soeren

  • Supreme Robot
  • *****
  • Posts: 4,672
  • Helpful? 226
  • Mind Reading: 0.0
Re: Cell-phone control with DTMF
« Reply #12 on: December 09, 2009, 05:06:39 AM »
Hi,

Quote from: Afroman on December 09, 2009, 12:16:22 AM
Where are you buying your DTMF decoder ICs from? They are pretty hard to find these days.

Yes, sadly a lot of the "Oldies But Goodies" is vanishing, but you may be able to pick it up in a shop - go where the ham radio operators go, they use these chips a lot.

Or, accept the situation and start making the equivalent with a DSP chip.
A cheap way of DTMF decoding is using a dsPIC and the programming is nearly all done for you: Microchip Libraries for DTMF on dsPIC
Logged
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline billhowl

  • Supreme Robot
  • *****
  • Posts: 370
  • Helpful? 32
  • Your success is in your hands.
Re: Cell-phone control with DTMF
« Reply #13 on: December 09, 2009, 06:36:39 AM »
Logged
 

Related Topics

  Subject / Started by Replies Last post
19 Replies
6303 Views 		Last post April 06, 2008, 01:39:26 PM
by Admin
1 Replies
2770 Views 		Last post June 18, 2008, 03:10:16 PM
by Admin
5 Replies
3956 Views 		Last post August 20, 2008, 09:57:39 AM
by kevinisnekkid
7 Replies
2817 Views 		Last post February 06, 2010, 05:56:12 AM
by scadabg


Get Your Ad Here

data_list