> It uses the phone's audio jack and Bell 202 modem-like FSK encoding with up to 1225 bit/s.<p>That seems very low, considering that there is solid wired connection between the two endpoints. Even actual modems pushed bits way faster than that, and PSTN transmission quality is much worse.<p>I suppose this is hampered by the fact that Arduinos do not have proper DACs, but still I wonder how fast you could use something like libquiet <a href="https://github.com/quiet/quiet" rel="nofollow">https://github.com/quiet/quiet</a> on a Arduino.
It's WebAudio as a data channel weekend! Also on the front page:<p>Using the Web Audio API to Make a Modem
| <a href="https://news.ycombinator.com/item?id=15471723" rel="nofollow">https://news.ycombinator.com/item?id=15471723</a>
Hey this is actually pretty cool!<p>Always was kind of bummed out over my apple devices not having a cheap and easy way to visualize data from an arduino (Well technically I guess you could use Bluetooth Serial but that would require you to write an app in ObjC which Im not really familiar with)<p>On my old android devices I just used USB OTG together with processing and since processing is already Java it was trivial to make it work on android (Processing supports export to android, but for serial you had to write your own wrapper, which isn't that hard)<p>At first I was skeptical but this could very well become my new "processing" together with various HTML5 visualization libraries such as D3 or even processing.js.<p>Starred this one for sure!