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

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+
+# Stream Analog Input to Serial Output
+
+## General Description:
+
+We just send the audio data that we receive from microphone the Serial output, so that we can monitor it in the Serial Plotter.
+
+Here is the result on the Arduino Serial Plotter:
+
+![serial-plotter](https://pschatzmann.github.io/Resources/img/serial-plotter-sine.png)
+
+
+### Analog Input:
+
+| ADC     |  ESP32  | UNO R4
+| --------| --------|-------
+| VCC     |  3.3V   | 3.3V
+| GND     |  GND    | GND
+| OUT     |  GPIO34 | A0
+
+For the input I was using a MCP6022 Microphone Sensor.
+Plaese note that the signal that we receive from the ADC might need to be adjusted so that it is oscillating around 0.
+
+![MCP6022](https://pschatzmann.github.io/Resources/img/mcp6022.jpeg)

libraries/audio-tools/examples/examples-stream/streams-adc-serial/streams-adc-serial.ino

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+/**
+ * @file streams-analog-serial.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-adc-serial/README.md
+ * @copyright GPLv3
+ * #TODO retest is outstanding
+ */
+
+#include "Arduino.h"
+#include "AudioTools.h"
+
+AnalogAudioStream in; 
+AudioInfo info(8000, 1, 16);
+CsvOutput<int16_t> out(Serial); // ASCII output stream 
+StreamCopy copier(out, in); 
+
+// Arduino Setup
+void setup(void) {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  auto cfgRx = in.defaultConfig(RX_MODE);
+  // cfgRx.start_pin = A1; // optinally define pin
+  // cfgRx.is_auto_center_read = true;
+  cfgRx.copyFrom(info);
+  in.begin(cfgRx);
+
+  // open output
+  out.begin(info);
+
+}
+
+// Arduino loop - copy data 
+void loop() {
+  copier.copy();  // 
+}