DTMF Decoding in Software

Paul Stoffregen

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Testing the tone detection object in the Teensy Audio library.

Components

1 × 7 Segment LED
1 × Teensy 3.1
1 × 10uF capacitor blocks the DC between the phone and ADC input
1 × 5V isolated DC-DC switcher + capacitors Adds 5V to 5V. The telephone won't work with less than about 8V bias
1 × 2.2K & 10K resistors For DC bias at the ADC input pin

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Old 8 bit AVR DTMF Code
Paul Stoffregen • 11/27/2015 at 11:39 • 0 comments

I recently dug up the old 8 bit AVR DTMF decoder I wrote many years ago.
https://github.com/PaulStoffregen/AVR_DTMF
Updated links to example code
Paul Stoffregen • 06/09/2015 at 11:57 • 0 comments

Update: the example DTMF code links are:
https://github.com/PaulStoffregen/Audio/blob/master/examples/Analysis/DialTone_Serial/DialTone_Serial.ino
https://github.com/PaulStoffregen/Audio/blob/master/examples/Analysis/DialTone_7segment/DialTone_7segment.ino
Source code (open source)
Paul Stoffregen • 02/20/2014 at 10:23 • 0 comments

Here is the source code used for this DTMF decoder demo.
https://github.com/PaulStoffregen/Audio/blob/maste...

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Paul Stoffregen wrote 06/09/2015 at 11:50

Sorry, the old link was to the beta version. The library grew to too many examples as it developed, so many examples were moved into folders before the 1.0 stable release. Now that it's "stable" (as of October 2014), every attempt will be made to avoid moving files and making incompatible API changes.

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Paul Stoffregen wrote 06/09/2015 at 11:48

https://github.com/PaulStoffregen/Audio/blob/master/examples/Analysis/DialTone_7segment/DialTone_7segment.ino

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Paul Stoffregen wrote 06/09/2015 at 11:47

https://github.com/PaulStoffregen/Audio/blob/master/examples/Analysis/DialTone_Serial/DialTone_Serial.ino

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DTMF Decoding in Software

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Old 8 bit AVR DTMF Code

Updated links to example code

Source code (open source)

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