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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...
A better audio jack console cable for Google Nexus devices
http://www.pabr.org/consolejack/consolejack.en.html
Sometimes the serial port is merely a bunch of unlabeled pads on the circuit board. It was revealed in 2013 that many Google Nexus Android devices have a serial port multiplexed with audio signals in their 3.5 mm headphone socket. This is an interesting design decision because: Many mobile devices have an audio socket, even very small ones.
Audio Port: Data Transfer over Audio Port
https://mobileembeddedsystems.blogspot.com/2010/03/data-transfer-over-audio-port.html
Usually the serial port settings are given by 8N1, 9600 baud for example. Where 8 = Number of bits per character, N = No parity bit, 1 = Stop bit. The 9600 baud rate (bits per second) is considered common for slow connections.
Using A Headphone Jack As A UART | Hackaday
https://hackaday.com/2014/11/04/using-a-headphone-jack-as-a-uart/
Unless something changed since Android 2.3 bidirectional audio isn’t possible since the task of reading the input audio stream fast enough to read the serial data would block all other tasks on ...
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