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If in program on Android phone it's hard to get access to serial port or, as it was in my case - I couldn't find a connector for my phone, it's possible to let the Android phone generate necessary logical signal via audio channel. To test it I made the phone to control two servos (via stereo output channel).
Because I did not want to damage my phone during development I connected to it first via bluetooth headset. When schema was completed and tested I successfully tried it directly via audio jack.

Hi,<br> Is there any special circuit require to perform operation for audio data out (Android) to data in (Arduino). Kindly help me to achieve this. I got source code from <a href="https://github.com/guillaumedupre/AudioSerial" rel="nofollow">https://github.com/guillaumedupre/AudioSerial</a><br> <br>
Hi, I added above a circuit I used
Amplifier was taken from a cheap radio receiver. Circuit was made according a test circuit from datasheet and added with transistor switches to make signal square.

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