Scienceprog has posted how-to build a DTMF tone detector. DTMF are the standard sounds used in tone dialing. Plugging this circuit into your phone line you can decode the all the tones on the line ...
Nope, no microcontroller here, just a full-blown cellphone used as the brains of this little robot. The secret behind how it works is in the sounds the phone makes. The touch tones, known as DTMF, are ...
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