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Home Page: http://forskningsavd.se
Arduino code and board schematics to generate dtmf tones and transmit on a phone line
Home Page: http://forskningsavd.se
Two outout two resistors connected and PWM (success proven but signal can be to bad for some switches.).
Commit arduino shield/board from eagle files to keep track of both HW toghether with software source.
A sinus tone generator similar to this one is needed:
http://www.uchobby.com/index.php/2007/11/11/arduino-sound-part-1/
Look at this document for reference to PWM tone generation.
http://www.atmel.com/dyn/resources/prod_documents/doc1982.pdf
Try to use pcmAudio dtmf tones and see if the teleswitch detects them. If that works then start forksing audioPCM if it fails then continue research on possibilities with atmel dtmf and calculated output.
To produce nice but slow sine waves look at:
http://www.avr-asm-tutorial.net/avr_en/AVR_DAC.html
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