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The trick to making this all work is the UPDI interface: a single-wire UART interface for programming and debugging Microchip’s newer 8-bit AVR microcontrollers.
I bought an air quality sensor for my Raspberry Pi, and they've written this Python script to show how to use it: try: import struct except ImportError: import ustruct as struct import serial uart ...
The trick is using some Python code (using the awesome pyserial module) to down-quantize the audio data to fit these eight possible values and then push them out at the correct sampling rate ...
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