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[on:]

This project is based in my father's project "DTMF remote control with PIC". http://www.atva.com.ar/dtmf_3dj/dtmf_3dj.htm (spanish)
Since I haven't time to work with PICs, I ported the project to AVR using an Atmega328p with Arduino bootloader.

This project is very similar to my father's one, because the working method is the same. We use a DTMF decoder like MT8870 or HT9170 (compatible pin to pin) to decode the analog audio signal and 'extract' the dtmf codes and convert it to a digital binary signal.

That binary signal is easily interpreted by an Arduino, after that I parse it storing the received signals into an array to command some outputs.

This is the github project: https://github.com/masterl1nk/DTMFDuino

Here is the schematic circuit:

And a video:

Sorry for my english!

Greetings from Argentina

[Reply #1 on:]

Nice project!
How save is this against intruders?

[Reply #2 on:]

Hi, thanks!!

For the moment no. There isn't a security implementation because where i go to put this i don't need any secured system, but is very easy to develop a function to protect the controller (with a hexa password I think)