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Greetings all,

I'm just looking into developing a relatively simple app. I have no programming knowledge myself but have enlisted someone who has some basic experience.
What I'd like some help with is utilizing the iPhone's 3.5 jack in an app. Is there somewhere I might be able to find some sample coding or specific info on using the jack to send a signal through a cord? For example, if I were to connect a cord to the iPhone and a buzzer, I would want to have the buzzer controlled by pressing a button in the app. Any help here would be greatly appreciated. Thanks!