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Android Automate With Arduino Using Audio Serial for ...

    https://www.instructables.com/Android-Automate-With-Arduino-Using-Audio-Serial-f/
    Serial.begin (2400); //set the baud rate to 2400. pinMode (13,OUTPUT); /*set the pin 13 as digital output (you would connect a relay to this pin to control a device )*/. } char buf [5]; //buffer to place characters read.

Android serial port via audio jack - Stack Overflow

    https://stackoverflow.com/questions/8425617/android-serial-port-via-audio-jack
    You can record audio on the microphone jack without any problems. Doing this, you can essentially use your Android phone as a digital oscilloscope. You can then programatically convert this back to digital I/O. Serial output -> Android audio input -> Sampled square block wave -> digital I/O Please note that most serial levels are either 5V or 3.3V.

Android Audio-serial Connection - Hackaday

    https://hackaday.com/2010/02/01/android-audio-serial-connection/
    A program running on the Android device takes the accelerometer data and converts it into a 9600bps audio signal, kind of like a dial-up modem. His custom circuit board takes that sound in through...

RS232 serial signal input via 3.5mm audio port of android ...

    https://stackoverflow.com/questions/19383890/rs232-serial-signal-input-via-3-5mm-audio-port-of-android-smartphone-android-de
    RS232 serial signal input via 3.5mm audio port of android smartphone (android developing)

Add an audio input to Android | TechRadar

    https://www.techradar.com/news/phone-and-communications/mobile-phones/add-an-audio-input-to-android-1189160
    First, you need to get a 3.5mm to three RCA socket adapter for about 10 bucks. This adapter is normally used for camcorders, but plugged into your phone's headphone socket, the red RCA socket...

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