Prepare an audio input device with two mics and provide a python library for interaction from PC

[an-dr]

Idea

• Get data from two mics
• Transmit it via UART
• Have a python library with double buffering (see: https://dsp.stackexchange.com/a/28732)

References

• https://circuitdigest.com/microcontroller-projects/simple-arduino-voice-recorder-for-spy-bug-voice-recording
• https://pyserial.readthedocs.io/en/latest/pyserial_api.html

Components

• 2x - MAX9814 CMA-4544PF-W microphone module
• 1x - Arduino UNO R3, ATmega328P

Possible technical characteristics

• Audio 8bit, 44.1 kHz ➡️ 352'800 bit/s per mic ➡️ 705'600 bit/s (UART - 921600 bauds)
• Audio 8bit, 8 kHz ➡️ 64'000 bit/s per mic ➡️ 128'000 bit/s (UART - 230400 bauds)
• Audio 8bit, 7.2 kHz ➡️ 57'600 bit/s per mic ➡️ 115'200 bit/s (UART - 115200 bauds)

---

• Blocks https://github.com/Zakhar-the-Robot/lib_py_sound_processing/issues/2
• Blocks https://github.com/Zakhar-the-Robot/lib_py_sound_processing/issues/1

[an-dr]

@salveron FYI, I plan to do it in 1-2 weeks