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Editorial Team
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Asked: 2026-05-24T06:50:37+00:00

I am looking at a project where we send information from a peripheral device

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I am looking at a project where we send information from a peripheral device to an iPhone through the microphone input.

In a nutshell, the iPhone would act as a voltmeter. (In reality, the controller we developed will send data encoded as voltages to the iPhone for further processing).

As there are several voltmeter apps on the AppStore that receive their input through the microphone port, this seems to be technically possible.

However, scanning the AudioQueue and AudioFile APIs, there doesn’t seem to be a method for directly accessing the voltage.

Does anyone know of APIs, sample code or literature that would allow me to access the voltage information?

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1 Answer

  1. Editorial Team

    The A/D converter on the line-in is a voltmeter, for all practical purposes. The sample values map to the voltage applied at the time the sample was taken. You’ll need to do your own testing to figure out what voltages correspond to the various sample values.

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