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libraries/audio-tools/examples/examples-stream/streams-adc-i2s/README.md

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+# Stream Analog Input to I2S
+
+## General Description:
+
+In this sketch we get the data from via the ESP32 I2S ADC and send it to I2S
+Since the ADC via I2S is using the i2s port 0, we use port 1 for the output.
+
+### Analog Input:
+
+| ADC     |  ESP32
+| --------| ---------------
+| VCC     |  3.3V
+| GND     |  GND
+| OUT     |  GPIO34
+
+For the input I was using a MCP6022 Microphone Sensor.
+Plaese note that the signal that we receive from the ADC needs to be adjusted so that it is oscillating around 0.
+
+![MCP6022](https://pschatzmann.github.io/Resources/img/mcp6022.jpeg)
+
+
+### External DAC:
+
+
+For my tests I am using the 24-bit PCM5102 PCM5102A Stereo DAC Digital-to-analog Converter PLL Voice Module pHAT
+
+I am just using the default pins defined by the framework. However I could change them with the help of the config object. The mute pin can be defined in the constructor of the I2SStream - by not defining anything we use the default which is GPIO23
+
+DAC  |	ESP32
+-----|----------------
+VCC  |	5V
+GND  |	GND
+BCK  |	BCK (GPIO14)
+DIN  |	OUT (GPIO22)
+LCK  |	WS (GPIO15)
+FMT  |	GND
+XMT  |	3V (or another GPIO PIN which is set to high)
+
+- DMP - De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
+- FLT - Filter select : Normal latency (Low) / Low latency (High)
+- SCL - System clock input (probably SCL on your board).
+- FMT - Audio format selection : I2S (Low) / Left justified (High)
+- XMT - Soft mute control(1): Soft mute (Low) / soft un-mute (High)
+
+![DAC](https://pschatzmann.github.io/Resources/img/dac.jpeg)