Comment on Projects: hijack (Hijacking the iPhone earphone jack)Comments−joezydeco15yThe O'Reilly "iPhone Hacks" book has schematics and sample code to push RS-232 in and out of the headphone jack. You'll need a self-powered device to decode FSK on the other end, of course.
Comments
The O'Reilly "iPhone Hacks" book has schematics and sample code to push RS-232 in and out of the headphone jack. You'll need a self-powered device to decode FSK on the other end, of course.