From the 24 Hours of mad hacking, here’s the two repositories for the Badgeduino-Modem + iPhone controller:

https://github.com/kjrose/Arduino-Badge-Driver—iPhone

https://github.com/kjrose/Badgeduino-Modem

These are both really hacky and primitive code, but they work and they get you started on having a simple audio modem between an iPhone and badgeduino. Pretty fun stuff to work with actually.

KJR

It’s not pretty, but here’s the code for the badgeduino Modem