A number of industrious individuals have achieved what to some is the holy grail of iPhone accessories: an iPhone keyboard. But most have done it in a very hard-to-repeat manner, and few have shared the methods they used.
Expanding on their audio port modem , PerceptDev engineers Zack Gainsforth and George Dean developed a hardware and software solution that allows infrared keyboards to be used for typing on the iPhone, using less than $20 of electronics.
Zack created a modified version of the microcontroller firmware used for the audio port modem, expanded to detect an infrared signal or read from a USB host controller, then read the data transmitted by an attached keyboard and convert it to an FSK signal for transmission to an iPhone.
George then modified the iPhone application to interpret the keyboard data and display the appropriate characters on-screen.

We will be releasing schematics and source code with the release of iPhone hacks.
(This is a cross post of: http://www.perceptdev.com/labs/content/iphone-keyboard-no-jailbreaking-required-using-20-sdk)






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