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I am trying to trigger an iPhone's camera with my own development board. I figured it out volume up/down signal is trigging the iPhone's camera, but I managed it at an Android device with touching an 220R or 600R resistor from mic pin to gnd pin. iPhone didn't even recognize my board as a headphone.

A 10K resistor from mic pin to gnd pin gives me the recognition as a headphone for iPhone but touching an 220R or 600R resistor from mic pin to gnd pin does nothing.

I noticed there is a 2.4V between mic and gnd pins and when volume up/down event happens this voltage drops to 2.2V.

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  • Which connector are you using, Lightning or 30pin?
    – nohillside
    Apr 17, 2019 at 7:56
  • It's only 3.5mm jack Apr 17, 2019 at 8:26
  • Are you taking the different pin layouts into account?
    – Asmus
    Apr 17, 2019 at 10:45
  • Yes, i know mic and gnd pin is different at Apple. Apr 17, 2019 at 11:53

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