This project displays telephone numbers decoded from tones. A microphone picks up the tones, a preamplifier boosts the signals, an SSI-202 DTMF chip decodes the tones, a Basic Stamp acts as an interface to an LCD display and also provides “RS-232″ serial output.The software for this project. It is only a bare-bones program. The smart people that build this circuit will surely write some better programs.
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