$59 Cable Lets You Connect iPhone to Arduino — No Jailbreaking!
New in the Maker Shed: the Redpark Breakout Pack for Arduino and iOS is the first general-purpose serial cable that Apple has approved for the iPhone, iPad, and iPod touch. On one end, it’s got a dock connector to plug into your iOS device. On the other end, it’s got an RS232 port that you can easily connect to Arduino or any other gadget that speaks a serial protocol.