Arduino based DTMF tone generator

This project demonstrates how to generate DTMF tones only using Arduino Uno.

This is a library to generate DTMF tones only using Arduino Uno. It is designed to work with R-2R ladder based DAC to produce DTMF tones.

For more information about this library please check this medium.com article or my blog post at jayakody2000lk.blogspot.com.