Dtmf From Mobile |
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73 Threads found on edaboard.com: Dtmf From Mobile
dtmf is like a voice. If you do not use a mic to detect this sounds you do not need a dtmf receiver , if you want to communicate with cell phone by data cable or IRDA , it is just a digital communication. dtmf has nothnig to do with it.
Microcontrollers :: 17.09.2004 16:34 :: Free_Will :: Replies: 11 :: Views: 6710
The comming noise is the confort noise sent from network to mobile when discontinued transmission is used or when no speech signal is going on between mobile and network. It could be important when duplexer is threshold activated ( let say hands free kind of implementation ) .But if hybrid transformer solution is applied and gain will be (...)
Professional Hardware and Electronics Design :: 09.12.2003 16:37 :: artem :: Replies: 9 :: Views: 2428
In gsm , when button is rpessed to generate dtmf tone - phone wont do generate the tone - it sends message to gsm switch where it is generated by special dtmf tone generating equipment. If somebody will try to send a tone thorugh phone's microphone the one should be aware that phone voice encoding is synthetis - no one to one frequency spectre tran
Microcontrollers :: 10.09.2006 02:49 :: artem :: Replies: 8 :: Views: 2375
Are you using this :- MT8870 datasheet pdf datenblatt - Mitel Networks Corporation - ISO2-CMOS Integrated dtmf Receiver ::: ALLDATASHEET :::
it says the input is on pin.
Frank
Hobby Circuits and Small Projects Problems :: 30.08.2011 21:32 :: chuckey :: Replies: 6 :: Views: 1469
dtmf can be detected if the call is from a telophone by sim900, but how can i detect dtmf from a gsm , or in othor words how can i send dtmf tone from my mobile...
i am confused as when i call a callcenter they automaticaly detect dtmf tone if i send it (...)
Microcontrollers :: 18.10.2011 12:45 :: sherazi :: Replies: 0 :: Views: 428
is there a circuit i can add to the mt8870 to connect it to the microcontroller and what it do?
i made a circuit as on mt8870 datasheet a on the dtmf input i connected it to a telephone and on the q1-q4 to leds but when i dial any number on the phone no led turns on !!! so what's the problem?
Microcontrollers :: 30.01.2012 12:53 :: foxbrain :: Replies: 18 :: Views: 1578
what is your question?
you need multiple interfaces, including the dtmf detector is drived from speaker output your mobile phone
Microcontrollers :: 13.02.2012 12:10 :: Li_ereunpisan :: Replies: 1 :: Views: 252
Hi
i use sim900 and firmware
1137b08sim900m64_st_dtmf_jd_mms
i also use mic for ivrs
when there is no voice transfer form modem to mobile.....dtmf are working
but when there is a voice transfer from modem to mobile.....dtmf are not working properly ,some time randomly (...)
Digital communication :: 22.10.2012 15:38 :: nngohel :: Replies: 3 :: Views: 554
Hi
I have used the Sony Ericson GM29 cellular modem
You can send & receive SMS messages via RS232 interface
This modem cost around $120 and work for GSM network
You can also send Audio command via this modem for instance dtmf signal after esablishing a connection.
It's a bit simple idea from using SMS messages
You can search th
Microcontrollers :: 15.11.2003 16:40 :: bobcat1 :: Replies: 5 :: Views: 1645
Why don't u just use sms?
or a data connection from one gsm to another?
Just put your gsm in data mode (AT+CBST=71,0)
Or call in data mode with another GSM
Connect another gsm to a PC/Laptop/PDA with serial connection/irda/bluetooth/... and write a small application to get the data you want.
now you have 9600 baud (some gsm networks supp
Microcontrollers :: 07.04.2004 11:16 :: Antharax :: Replies: 21 :: Views: 9883
Hi
SI-LABS have an app not for the 8051Fxxx for decoding dtmf signal all written in C language
All the best
Bobi
About what application you talk? AN122 - here there is only outputs dtmf tones!
Added after 20 minutes:
Hi;
you als
Microcontrollers :: 04.11.2005 21:37 :: Make_Pic :: Replies: 36 :: Views: 6200
Dear Friends
Currently I am working on a Intruder Alarm system project with auto-dialer facility.
In our system we dial the remote user during security break-up, also we are giving facility to control the system using dtmf keys from the remote side.
Now we are facing some problems:
(1) Initially we designed the hardware, then we wrote the s
Analog Circuit Design :: 10.11.2005 08:46 :: unishilp_rajib :: Replies: 1 :: Views: 853
See this link, might be a useful....although they are not using dtmf
Good luck
Microcontrollers :: 03.12.2005 18:11 :: Jack// ani :: Replies: 14 :: Views: 8106
thats really crazy... the cost:speed ratio will be high........
but its really exciting to do it.............
ofcourse i to worked on it... but gave up......
may be i can help u.......
think u can do it by dtmf ........
if u r using the nokia phone then u can use an usb cable to connect it to pc..
This would add a virtual COM port to
Digital Signal Processing :: 19.01.2006 05:49 :: shortcircuit :: Replies: 3 :: Views: 655
Hi, If you want to send data this way better use dtmf look for encoder en decoder chips. Its slow data transport but no problem for telephone network. Paul.
Microcontrollers :: 05.07.2006 14:27 :: PaulHolland :: Replies: 26 :: Views: 7263
ok,
the project is "wireless security door lock"-----> it means that:
1) i have a door like one of my home this door will not open unless i enter
thecorrect password saved on the EEPROM of the ?controller.
2) i am aiming to enter this password from the keypad of my mobile(GSM)
,so there is two solutions:
1st >> connecti
Network :: 25.07.2006 05:17 :: veiledcavalier :: Replies: 5 :: Views: 1208
you can use a dtmf to bcd decoder.you ll get a bcd output which you can interface with a ?c and do whatever you want.once i used this to interface with a mobile phone to control 4 switches of course you can control more .heres a schematic which you can connect to landline and control 4 switches.you need to dial the landline and press 0(im not sure
Microcontrollers :: 18.03.2007 16:09 :: nipun :: Replies: 2 :: Views: 951
ASA
hi 2 all
im currently working on voice interactive system ..........
im using cell phne at reciving end. can any body tell me how do i detect which key pressed from the dialing end ?
do i use AT cmmands or dtmf tone decoder ic ???
thx.
Microcontrollers :: 06.09.2007 20:48 :: drbizzarow :: Replies: 2 :: Views: 579
use oscope to view the dtmf signal ..
Microcontrollers :: 14.02.2008 13:51 :: segmex :: Replies: 12 :: Views: 1312
Dear forum,
Hope you are doing well.
I have been working with the dtmf decoder MT8870 for few months but i could not get success. I have used few circuits mentioned in the datasheet. But i am facing problem *, 0, # , 7, 8 ,9 buttons are working but sometime works the 1, 2, 3, 4, 5, 6.
Why is that???
I have connected to MT8870 Pin 2,
Microcontrollers :: 15.02.2009 13:56 :: sakaz :: Replies: 5 :: Views: 6161
it must work
i have made it sevrel times.
u can do use, fm transmitter/reciever for dtmf transmition.
best dtmf generator ic is ht9200.
this is 8 pin serial generator.
u must use MCU to use it.
bye.
Microcontrollers :: 28.04.2009 14:36 :: Noman Yousaf :: Replies: 10 :: Views: 9435
hie I m Tejas doing my final year and m planning to take up dtmf controlled circuit application for eg. a wireless robot or a door lock etc.
First of all i m newbie and dont have exact knowledge on dis.
I want to know dat will dis circuit require using two cell phones one used as a remote and the other one on the robot or will a single mobile pho
Microcontrollers :: 19.06.2009 10:34 :: shethia.tejas :: Replies: 2 :: Views: 1866
I am interfacing a mobile phone with a micro controller using a dtmf decoder (HT9170) and the signals from the head set cable. I need a provision to detect when the call has ended. Most circuits in the net are for phone lines
Thanks for the help
Microcontrollers :: 16.12.2009 14:35 :: vysakhpillai :: Replies: 0 :: Views: 1220
My project (dtmf Teleremote Control) spinning around a lot of strange problems. Every now and then it occurs and after some thought
if cannot figure out, I go for Forum Thread posting. I optimize no one get bitterer by checking indistinguishable subject.
But I anticipate this would be an open place to clear any doubts (basic to advanced) of a com
Analog Circuit Design :: 24.02.2010 18:22 :: vinodquilon :: Replies: 0 :: Views: 450
Lets imagine some situation. We are AT the Holiday. Sailing in transatlantic ship. Suddenly we realized that we have left iron plugged to power grid. No one is home, so only one solution is to call to your neighbors. Ok, but what if
Show DIY :: 10.03.2010 22:33 :: gres :: Replies: 0 :: Views: 1058
i have a problem with my circuit and i can't figure out what.
if i use a parallel phone line it works great but when i call from a cellphone or another phone it doesnt work what could be the problem plz i need an answer as fast as possible if someone knows thanx in advance :)
Hobby Circuits and Small Projects Problems :: 01.04.2010 15:53 :: zouzanda :: Replies: 6 :: Views: 1983
hai here i have a peculiar problem
i have taken the dtmf output form mobile(nokia 2626)
what will be the voltage of the dtmf signal???
i hav kept a voltmeter at the mobile jack to measure the output voltage from jack
it reads zero?????
ok leave that ihav two wires from the (...)
Digital Signal Processing :: 08.06.2010 17:03 :: dss91 :: Replies: 5 :: Views: 1120
delayed steering (Std) output of the IC goes high on receiving the tone-pair, causing LED5 (connected to pin 15 of IC via resistor R15) to glow. It will be high for a duration depending on the values of capacitor and resistors at pins 16 and 17. Make differential Input for reduced noise
Hobby Circuits and Small Projects Problems :: 25.09.2011 07:33 :: ALERTLINKS :: Replies: 28 :: Views: 5526
Hi...................
I am doing a project on GSM.. In that i want to detect the key pressed at the other side on active call.... I am trying with a dtmf decoder circuit at speaker output but it is not working...Plz if any one has any other idea or solution plz reply...........
Microcontrollers :: 11.11.2010 07:05 :: Manu.electronics :: Replies: 4 :: Views: 2491
I am about to do a proj regarding dtmf control of home appliance using mobile phone..i have many doubts..like where to fix the appliance..and which key turns on/off which appliance....can any1 please help me!!!!
Electronic Elementary Questions :: 08.01.2011 14:10 :: snehanair :: Replies: 9 :: Views: 2278
Hello everyone! My name is Franck. I am final year student. I am doing my project now but it is not working. My problem is with the dtmf decoder circuit. I am using the MT8870 dtmf decoder IC, the MT8870 dtmf decoder circuit is given in its datasheet and it is not giving me any ouput. I am pretty sure my problem lies at the input. The input (...)
Electronic Elementary Questions :: 27.01.2011 16:46 :: Franck1991 :: Replies: 0 :: Views: 1531
Controlling a robot using a mobile phone is easy. I use HT9170 dtmf decoder for it. First the robot need to have a mobile phone on it ( or some GSM receiver ) with the dtmf decoding circuit. You make a call to it, it should be automatically answered, and now as you press the keys of your mobile phone, at the (...)
Robotics and Automatics Forum :: 04.03.2011 08:48 :: prmurthy :: Replies: 16 :: Views: 1156
i dont knw if i am dnd andything wrong but i am not gting the led lit
is there anyway yo check if the chip is working ?mayb tats wat tat has gone wrong
There are lot of fake ic's found in the market, especially dtmf decoder. Try a different chip from different dealer/shop.
Analog Circuit Design :: 19.05.2011 14:55 :: nandhu015 :: Replies: 19 :: Views: 1692
hello everyone
i made aproject using a gsm mobile dtmf based home light that i need two things.
1. pasword system
2. when we do press any key then from my device side it inform about it accepted operation and welcome message and other message also.
so please guid me about this process.
Analog IC Design and Layout :: 26.08.2011 19:17 :: deepakgupta.rf :: Replies: 0 :: Views: 390
hi , i am making a dtmf decoder but facing lot of problem . i am using the following circuit from Mt8870 data sheet but it is not working . tried at least 10 -20 times .
63090
Today while browsing eda i also got this ckt .
63089
i am not sure if that will work . but will surely try .
Analog Circuit Design :: 22.10.2011 19:58 :: mihir08 :: Replies: 10 :: Views: 3070
67193
67194
where the image is more sensitive dtmf??
Analog Circuit Design :: 12.01.2012 14:58 :: Li_ereunpisan :: Replies: 7 :: Views: 552
My alarm panel will call my mobile phone when it is activated. However, to acknowledge that I have received the notice, and so stop the alarm panel from resending the alert, I need to reply with a 1400 Hz hand shake kiss off signal tone.
If I press the button on my phone, this will generate a dtmf 1477 Hz and 697 Hz tone. Will this be close
Hobby Circuits and Small Projects Problems :: 02.02.2012 22:04 :: JohnJohn20 :: Replies: 4 :: Views: 966
I know it is absolutely not dial pulsing mode, but is it then dtmf?
Network :: 11.02.2012 22:54 :: W_Heisenberg :: Replies: 12 :: Views: 512
You can set autoanswer option in phone to answer just on particular phone numbers (yours) this will prevent someone else to press some digits and activate/deactivate some relays.
Use handsfree headspeakers for input to your circuit. Input section of your circuit should be modified to accept lower voltage signal from handsfree headspeaker.
You
Digital communication :: 20.03.2012 17:36 :: tpetar :: Replies: 2 :: Views: 289
At command set is for sending messages or receiving messages and dialing a phone. For that you need a Sim card and network connection. But in your case you can make use of dtmf(dial tone multi frequency).
B clear whether you want to press keys and do the project go for dtmf
if you want to send message then go for GSM module with AT Command Set.
Professional Hardware and Electronics Design :: 01.04.2012 13:28 :: aameer :: Replies: 24 :: Views: 1125
I have attached the dtmf decoder circuit using MT8870 IC. I that circuit, at the input section two zener diodes are used face to face..
I want to know why it is used...???
i am using a mobile phone instead of telephone.... its working fine... but can i remove those zener diodes...???
73455
Thanks in adva
Digital communication :: 01.05.2012 10:04 :: nithin kamath :: Replies: 2 :: Views: 585
Hello edaboard
recently I have been working on a remote automating system , building a circuit to recieve a dtmf signal from the telephone line and then do its job
but I am facing some problems . CM8870 is the circuit I used , would be the magnetic iso
Hobby Circuits and Small Projects Problems :: 12.07.2012 18:39 :: newbie noob :: Replies: 7 :: Views: 957
as a part of project i had connected mobile to dtmf Decoder Works Well(gives Output for all switch pressed ) But when I Make A call from Another mobile to the mobile that is connected to dtmf DECODER It Only gives output for pin Number 3 6 9 What Shoud Be the Reason?
I have Also Tried after (...)
Analog Circuit Design :: 11.10.2012 18:03 :: gajjar.nirav :: Replies: 0 :: Views: 192
i was working on dtmf decoder(MT 8870) lately and during that time i found that it was giving proper o/p on galaxy fit but not able to decode and give o/p on galaxy Y.Just try to plug in the device which gives you undesirable output and make a call from which you are getting correct output.
P.S when you jack in aux wire make sure your phones media
Hobby Circuits and Small Projects Problems :: 30.04.2013 12:20 :: gaurangpatel :: Replies: 11 :: Views: 270
is it possible to send sms messages using the phone and dtmf codes? like in the old pagers???
regards,
2000
PC Programming and Interfacing :: 20.01.2003 02:43 :: 2000 :: Replies: 48 :: Views: 15881
hahahahah
the solution is staring me in the face
up convert the dtmf to 6khz
simply add a 1khz modulation tone am using a small audio mixer to the transmited signal
then on the other end filter it out to leave the data
using a pll locked to the removed 1khz tone {this should deviate at 1hz}
adding a further referance tone
Professional Hardware and Electronics Design :: 26.06.2003 03:23 :: sick_man :: Replies: 28 :: Views: 10120
hi there :) well i wanna suggest u somethin ... y dont u try communication through mains.. ya this is possible.. n cheap too ... as my finsl year diploma (i jus passed diploma)project i made a swithcing device through mains but u can still modify that... c, u can use a normal fm transmitter n then by use of some coding.. like dtmf u can transmit
Hobby Circuits and Small Projects Problems :: 01.07.2005 04:01 :: swapsan :: Replies: 66 :: Views: 34064
dear,
your cellphone should able to produnye dtmf signal caose otherwise it wont't work.
and signal from cellphone should connect to input of MT8870
regards
Electronic Elementary Questions :: 04.01.2006 10:30 :: e_eja :: Replies: 3 :: Views: 825
well as far as i know its not possible easily.
What u r thinking is not feasible as it hard to catch the signals of/from a cellphone.
and might be illegal too.
but i think u can do your project by utilizing the dtmf code transmission available in cellphones.
Thats just a suggestion....u gota explore more.
good luck
Electronic Elementary Questions :: 15.01.2006 16:12 :: truebs :: Replies: 4 :: Views: 572
Hi,
I'm designing a telemetry system. I need the system reporting full readings via modem and / or , on demmand a sumary by "voice" in a basic telephone set ( the request is sended by a dtmf command).
The voice transmision will be numbers and very few words as "max" "min" "average" etc.
I'll appreciate your suggestions in terms of simples
Microcontrollers :: 16.01.2006 14:50 :: Trizas :: Replies: 3 :: Views: 773
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