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I have a circuit and I am trying to integrate it with an iPhone via a TRRS headphone jack's microphone input. I have a generic TRRS cord and am trying to send a signal through it. However, the iPhone does not detect that a mic is even plugged in. However, if I plug it into my Mac via line-in and record, I can record the signal I am sending perfectly.

I have read online that it needs to detect resistance between the ground and mic, which I have. Are there any other things I need to do? It seems like this is an issue that stems from Apple's proprietary technology, as the earbuds are from a Windows Phone before they were spliced.

Thanks so much!

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Schematic, please. – Brian Carlton Apr 27 '12 at 21:44
@BrianCarlton, knowing Apple I seriously doubt it. They don't want anybody making accessories without paying them kickbacks. – Joe Stavitsky Apr 27 '12 at 22:31
1  
I think he means of what he built – Journeyman Geek Apr 28 '12 at 2:05

1 Answer

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You might want to take a look at this and check if you have the same config.
http://www.wisebread.com/build-a-cable-to-control-your-android-phone-while-you-drive
I'm sure android and apple are the same kind (I've used them interchangeably) though samsung android phones have two rings swapped.

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