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175 Threads found on edaboard.com: Dtmf Control
i want to make a teleremote. in which i can control one or more relays by using dtmf and telephone line. the problem is, how can i off hook the line by using a relay and/or any circuit? pleas tell me. i don't want to use telephone set
thanks in adv
Microcontrollers :: 14.03.2006 15:57 :: Noman Yousaf :: Replies: 5 :: Views: 878
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: 5602
The data outputs ARE latched, they stay set even after the input tones are removed.
The strobe output is momentary and only present when a valid dtmf signal is being decoded.
If you want the output to be present only when a tone is heard, you need to logic AND the latch outputs with the strobe signal.
Brian.
RF, Microwave, Antennas and Optics :: 29.12.2010 16:55 :: betwixt :: Replies: 8 :: Views: 1079
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: 2314
Hi all,
ı cant enabled the dtmf decoder in sim900D
what's the AT commands pls hlp me :(
Digital communication :: 25.09.2012 08:05 :: baykoyu :: Replies: 0 :: Views: 134
:)
Sirs
Its a phone interface to use with any microcontroller/microprocessor.
Features
- Detect Ring
- Hook on/off control
- Read dtmf signal
- (use to control any application)
Have Fun
Jean Fernandes
coneel@engineer.com
Coneel
Smart Solutions
Microcontrollers :: 02.07.2003 01:29 :: jeanfernandes :: Replies: 8 :: Views: 1759
Dear José Luis
it can easly be implemented ; I have already implemented one that can work via dtmf commands .
The circuit idea is that : you call your home , after a specified nos of ringing (controlled) the line will open and wait for secret code ... according to this code , you can switch on/off unlimited no. of devices (controlled) (...)
Hobby Circuits and Small Projects Problems :: 21.12.2003 13:43 :: Vonn :: Replies: 9 :: Views: 3036
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: 6811
you will have to connect the dtmf decoder to the PIC pins. Then you can input the port status. This is not very difficult. Also you can look at google, their exist plenty designs with dtmf decoder chips, maybe also with yours.
Microcontrollers :: 16.12.2004 14:31 :: Mr_Programmer :: Replies: 7 :: Views: 1338
Hi ,
i am having problem working with UM91214b IC (dtmf generator IC ).
Can you suggest some other commonly available dtmf IC ,and its reciever.
You can also suggest me some circuit that you've tested with UM91214b.
I am using it for remote control application.
Thanks !!
Analog IC Design and Layout :: 03.04.2005 21:21 :: truebs :: Replies: 1 :: Views: 981
There is a well designed and simple to build dtmf intercom circuit using telephone handsets shown at:
The details and parts list for the dtmf portion are at:
Hobby Circuits and Small Projects Problems :: 11.07.2005 22:32 :: House_Cat :: Replies: 4 :: Views: 1797
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: 6273
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: 861
Use MT88L85 for dtmf coder/decoder
and a simple FM transceiver to make wireless
RF, Microwave, Antennas and Optics :: 21.11.2005 17:15 :: vfone :: Replies: 1 :: Views: 989
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: 8149
hi
this may help u
it contains the dtmf decoder and the ring detect
also the detection of the line status, off hook or on hook
hope that help u
Salam
Ahmed
Analog Circuit Design :: 07.03.2006 12:39 :: eng_ahmed22 :: Replies: 9 :: Views: 1204
Hi
Can anybody tell me how to use the dtmf tranceiver IC (MT8880) over a FM Transmitter/Receiver modules i.e inputs outputs and control, data transmission/receiving using parallel port and C Language.
Please help if anybody have used this IC.
Thanks.
RF, Microwave, Antennas and Optics :: 27.04.2006 22:19 :: mnasir :: Replies: 0 :: Views: 645
hi guys.
im trying to do a project. the last project i tried to do failed and didnt work due to my lack of understanding the 8051 and missing a lot of things.
my last project was something like this.
i wanted to communicate between two cars, which would communicate with each other and the lcd display in each car would show the distance be
Microcontrollers :: 28.05.2006 02:03 :: telecomm12 :: Replies: 1 :: Views: 1582
Hi,
I'm looking for a schematic for interfacing telephone line to a dtmf decoder (HT9172 Holtek), in order to build a remote control activated by phone.
Tkx.
Hobby Circuits and Small Projects Problems :: 01.11.2006 11:43 :: ewandeur :: Replies: 5 :: Views: 2026
you can use audio dtmf
method
dial the phone
then send dtmf tones {change the xtal that runs the dtmf chip to change its tones arrays}
this way its modified so as not to trigger the standard telephone dial circuit
ctcss seems a good cheep method with just a micro c
both methods amount to the same thing
Hobby Circuits and Small Projects Problems :: 07.12.2006 03:00 :: VSMVDD :: Replies: 12 :: Views: 3077
hi,
i am using MT8880 which is a dtmf transceiver..after initialisation of control reg i am giving the input of 7 i want to know, how to check that wheather this IC is txansmitting dtmf signal or not
thank u in advance
just connect the output to a working telephone line. You can hear the tone
simple
Na
Embedded Systems and Real-Time OS :: 30.05.2008 03:27 :: nandhu015 :: Replies: 5 :: Views: 920
hi,
i am using MT8880 which is a dtmf transceiver..after initialisation of control reg i am giving the input of 7 i want to know, how to check that wheather this IC is txansmitting dtmf signal or not
thank u in advance
Professional Hardware and Electronics Design :: 19.02.2007 10:18 :: prasannabalaji :: Replies: 2 :: Views: 1410
actually,i do connect a power source to the relay..and it works fine just as what i mention in the previous post..Besides the power source of the relay,do u have any idea on why the circuit cant works?basically, the TR2 is connected to the dtmf decoder...
Hobby Circuits and Small Projects Problems :: 07.03.2007 06:40 :: summersnow :: Replies: 5 :: Views: 2650
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 (...)
Microcontrollers :: 18.03.2007 16:09 :: nipun :: Replies: 2 :: Views: 961
Please download this file
Digital Signal Processing :: 09.04.2007 05:23 :: budhy :: Replies: 4 :: Views: 2603
hai
i had made a remote control using dtmf . but how to make o/p of 8870 to 0000 on power up . it is giving jung values on power up
Hobby Circuits and Small Projects Problems :: 09.05.2007 10:54 :: grittinjames :: Replies: 8 :: Views: 1354
Hi all,
I wanted to build an remote control unit using dtmf, transmitter as well as receiver to control electrical appliances for ON and OFF.
Suggest me a simple circuit which has least components also some ideas about dtmf ICs.
Thanks in advance.
Electronic Elementary Questions :: 07.01.2008 16:23 :: mytech :: Replies: 2 :: Views: 1723
Hi from Turkey.
I'm preparing for a competition which is about "Technologies Connecting to Life".
In this competition, our main theme is making life easier for handicapped people (mental, physical etc.). This is a student competition so we are not supposed to do complex or expensive projects.
I have decided to make an automatic door opener (I am
Digital communication :: 20.02.2008 22:32 :: targal :: Replies: 3 :: Views: 888
this one out, Instead of audio, you send your desired CODE and it must be of varying voltages. OK, suppose you take a TONE and transmit it, but the thing is that how will you decode at the other end. If you use the TONES of the telephone, then it can be decoded by th
Electronic Elementary Questions :: 06.05.2008 16:46 :: umery2k75 :: Replies: 4 :: Views: 633
Ofcourse you can do it if you have 2 cellphones. Make a call from one phone to the other and you must have some auto answer facility on the latter. Now when you press any key on the first phone you can hear a dtmf signal (corresponding to the key you pressed) on the second phone. You may tap the earphone/headset output of the second phone and decod
Hobby Circuits and Small Projects Problems :: 30.06.2008 19:47 :: matbob :: Replies: 4 :: Views: 1246
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: 6260
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: 9469
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: 1896
hi,
i have a project that about dtmf based stepper motor control via 16F877.
when i pressed 4, the stepper motor turn anticlockwise. 6; turn the clockwise and 5 is stop the motor. how can i do this? anybody help me?
Microcontrollers :: 10.07.2009 20:49 :: fuzzyram :: Replies: 0 :: Views: 920
Is there any way that I won't use microcontroller in doing this project?
Yes, there is. You can use a dtmf encoder at the transmitter side and, a dtmf decoder at the receiver side.
Now, you have not only the 9 freqiencies you need but also 6 extra frequencies for future improvements.
Take a look at the below link:
wo
Hobby Circuits and Small Projects Problems :: 10.09.2009 08:48 :: seadolphine2000 :: Replies: 14 :: Views: 4548
here is a data to dtmf tones dialer unit {not a decoder !!!}
allows for several timing modes and full tones adjustment
to reuse for other systems also can be reused as a submodel
if you want to add other control logic and decoders as a unit submodel etc
this unit provides squarewaves
you can offset this in the usual way using a resistor an
Software Links :: 16.09.2009 17:51 :: VSMVDD :: Replies: 0 :: Views: 915
hello
I am doing my FYP. my project is switching on or off devices using connected to telephone.
waiting for incoming call
after receiving call by pressing specific number can turn on of off devices.
i have also program the uM to detect emergency (like fire, sm
Microcontrollers :: 21.11.2009 07:41 :: bionunu :: Replies: 2 :: Views: 2335
I would like to make a 10 channel RF remote control to control the motion of my robotic car with a robotic arm that can perform some tasks. I'm going to use the IC UM91412B to generate dtmf, as what is posted at
My problem is that I would like to make it operate
Hobby Circuits and Small Projects Problems :: 27.11.2009 09:09 :: sfteoh2 :: Replies: 1 :: Views: 2962
hello friends, i had designed 'dtmf based device control' and a sample project is here at , the problem is some of the tone are not recoginised by the dtmf decoder and it differs for each cellphone, what can be the problem and solution for the same.
regards
kj
Microcontrollers :: 01.02.2010 08:51 :: welove8051 :: Replies: 1 :: Views: 486
See the attachment. On power up all four LEDs(1 TO 4) are ON.
Now there is one problem exists when detecting initial ring vots as all four output LEDs
dancing on and off for a duration of one second only, then comes into stable state
corresponding to state of key press 5. After off hooking the test end, the LEDs obeys the
normal tr
Analog Circuit Design :: 07.02.2010 08:24 :: vinodquilon :: Replies: 4 :: Views: 698
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: 456
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: 1066
Hi all,
Actually I need to decode dtmf tones from the speaker of the local telephone or GSM modem. My main requirement is that I want to detect the key pressing using this. I have tried with 8870 decoder. But i found circuits which comes directly from the telephone lines where as my ultimate application has GSM modem in lead. Like in simple lang
Microcontrollers :: 26.06.2010 08:51 :: Nikunj Tanna :: Replies: 9 :: Views: 2561
i cant use dtmf because gsm module have not support dtmf. Is there any software solution for dtmf?
There is no need for gsm module to support dtmf. You can use speaker/headphone output jack for detecting dtmf
Digital communication :: 17.10.2010 14:46 :: nandhu015 :: Replies: 9 :: Views: 781
check this,
Home automation using phone (dtmf touch-tone)
Digital communication :: 18.10.2010 18:34 :: vinodquilon :: Replies: 2 :: Views: 500
hi everyone,
i m interested in 'device control using dtmf' can anyone suggest me about this.any suggestion are heartly welcome.
Microcontrollers :: 10.11.2010 16:09 :: aegirmahrjn :: Replies: 3 :: Views: 558
hello sir,
please help us... how to connect dtmf decoder and mobile phone & microcontroller
Electronic Elementary Questions :: 25.01.2011 16:34 :: vanitapatil :: Replies: 3 :: Views: 2861
Hi i am a student working on a dtmf remote control device. I am using CM8870 decoder and am using a TP5089 to generate my dtmf.
i am attaching the original schematic that i have found on web, but different dtmf generator chip that i am using. The transmitter side of the first schematic is being prototyped right now. So i (...)
Hobby Circuits and Small Projects Problems :: 22.02.2011 00:58 :: mgiro :: Replies: 0 :: Views: 1034
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 receiver end (
Robotics and Automatics Forum :: 04.03.2011 08:48 :: prmurthy :: Replies: 16 :: Views: 1173
Did you have any sucess yet??
I have the same problem with dtmf tones sending by PIC16F877.
If your cct works , can nyou pls help me to do the same ..
THX
Microcontrollers :: 28.08.2011 13:33 :: ZS1BFE :: Replies: 13 :: Views: 1751
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