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DTMF with netduino plus 2

Help me to detect dtmf

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4 replies to this topic

#1 carlieou

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Posted 02 December 2014 - 04:49 PM

Hello Somebody help me to detect DTMF tones from a call with netduino plus 2?



#2 gangolfus

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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 zeroaviation

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Posted 03 December 2014 - 09:03 PM

If it was me.... http://www.holtek.co...m/comm/9170.htm

 

Cheers,

-MAtt



#4 Zoot

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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 Spiked

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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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