Hello Somebody help me to detect DTMF tones from a call with netduino plus 2?
#1
Posted 02 December 2014 - 04:49 PM
#2
Posted 03 December 2014 - 08:13 PM
Out of curiosity, what is your full project? I'm having a hard time imagining how a Netduino would be used with a telephone.
How will you be "listening" for the DTMF tones? Via microphone? Via VOIP?
#3
Posted 03 December 2014 - 09:03 PM
#4
Posted 13 December 2014 - 04:44 PM
I would use a DTMF decoder chip like the MT8870 or the chip that Matt suggested and have it talk to the Netduino. Much easier than trying to decode it with the 'duino.
#5
Posted 13 December 2014 - 08:56 PM
My 'I have never done it' guess would be you need to use a FFT to get the frequency of the tones.
http://www.arduinoos...-transform-fft/
has 11 pages explaining how to do it on an Arduino. I don't even know if the Managed Netduino is capable.
Give it a quick look, then go get a chip previously mentioned
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