How do the iphone 3gs headphone controls work? Do they use resistance or capacitance to tell the iphone that you want it louder or softer?
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M$2 Answers
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M$
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M$
Well Why didn't you say so?
http://awaitinginspiration.com/iphone-call-recorder
This project has diagrams showing notes and a how to, for creating a breakout box. The Remote Control and Apple condoned/signed hardware, is another issue.
This is the closest to the correct answer, but unfortunately there is not enough detail.
I assume the 4 pins are laid out as below.
Left
Right
Mic
Ground/common
If you interrupt one of these lines, then either the headphone sound, or the mic might get interrupted.
I am looking for exactly how the mic/volume controls work so that I can make a suitable breakout box to remote control the iphone in certain applications.