Android - How to sent Data to Arduino through Headphone Jack -

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How to send / receive data via headphone jack in android How to start the code for Android Is the sample? As I have come across various sites, they were told that digital data from Aridis should be sent as an audio signal for the smartphone and it has been demoded in the smartphone and vice versa, but I have to start this process. For better sampling has not been received, so anyone can recommend a sample to start.

I also checked it, but it is not clear


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