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kugg / dtmf

Arduino code and board schematics to generate dtmf tones and transmit on a phone line
http://forskningsavd.se
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Dtmf reference from atmel #2

Open kugg opened 15 years ago

kugg commented 15 years ago

Look at this document for reference to PWM tone generation. http://www.atmel.com/dyn/resources/prod_documents/doc1982.pdf