The latest version of the Tone library supports generating DTMF on board and there is an example sketch showing how:
Wow! And here I was thinking that DTMF required two piezos/speakers
With Quick-Reply you can write a post when viewing a topic without loading a new page. You can still use bulletin board code and smileys as you would in a normal post.
Warning: this topic has not been posted in for at least 120 days.Unless you're sure you want to reply, please consider starting a new topic.