Serial Android Using Audio Port

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Audio Output From A Serial Port | Hackaday

https://hackaday.com/2005/10/25/audio-output-from-a-serial-port/#:~:text=Yes%2C%20it%20is%20possible%20to%20get%20sound%20output,to%20the%20baud%20rate%20of%20the%20serial%20port.

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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.

Serial communication via audio on Android

https://davidawehr.com/blog/audioserial/

So, let’s see if can send a serial signal out the audio port. Serial Communication. Here’s a refresher on the asynchronous serial protocol. It runs at a pre-specified baud rate (commonly 9600, 57600, or 115200), which …

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)

Audio Port: Data Transfer over Audio Port

https://mobileembeddedsystems.blogspot.com/2010/03/data-transfer-over-audio-port.html

The design of my audio serial port is based on standard RS232 protocol. I am using the Audio output (Line-out) port as serial transmit from mobile phone to my microcontroller. The mic input (Line-in) port acts as serial receive from microcontroller to mobile phone. A level converter is used to convert the bipolar signals to unipolar levels.

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