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14 Threads found on Dtmf From Mobile
HI FRIENDS NOW AM INTERFACE 8870 WITH NOKIA 2310 CELL PHONE i check dtmf 880 q1,q2,q3,q4, outputs are working pressing all keys on only that mobile only and not working remote operation another mobile why.............??? am using c1=0.1uf, r1=10k, pin 2 r2=10k , pin 3
dtmf decoder MT8870.
I am using dtmf 8870 decoder for my project of cell phone based voting machine.The decoder is giving correct output whenever any input is being given by the phone(say, M1) connected to the circuit..but whenever i am giving any input from another mobile (say M2) through M1 it is not responding to the inputs other than 3,6,9,#.. what is (...)
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 (...)
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 (...)
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
i am thinking about home automation using 89c51/89s52 by decoding dtmf from mobile phone
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 (...)
I want to decode the dtmf tones sent from mobile's microphone but i have stuck in this. I am not getting output. I think there may be some problem in earphones' output .. Tell me how to connect earphone to dtmf decoder's IC. I am using MT8870.
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.
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
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.
you can use a dtmf decoder to sence the telephone signals
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.