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libraries/audio-tools/examples/examples-communication/a2dp/basic-adc-a2dp/README.md

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+# Stream Analog input to A2DP Bluetooth  
+
+We can read an analog signal from a microphone and and send it to a Bluetooth A2DP device. To test the functionality I am using a MCP6022 microphone module.
+
+![MCP6022](https://pschatzmann.github.io/Resources/img/mcp6022.jpeg)
+![MCP6022](https://pschatzmann.github.io/Resources/img/mcp6022-1.jpeg)
+
+The MCP6022 is a anlog microphone which operates at 3.3 V
+We sample the sound signal with the help of the ESP32 I2S ADC input functionality.
+
+### Pins:
+ 
+| MCP6022 | ESP32
+|---------|---------------
+| VCC     | 3.3
+| GND     | GND
+| OUT     | GPIO34
+
+### Dependencies
+
+- https://github.com/pschatzmann/ESP32-A2DP.git
+
+

libraries/audio-tools/examples/examples-communication/a2dp/basic-adc-a2dp/basic-adc-a2dp.ino

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+/**
+ * @file basic-adc-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-communication/a2dp/basic-adc-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+* 
+ */
+
+#include "AudioTools.h"
+#include "BluetoothA2DPSource.h"
+
+/**
+ * @brief We use a mcp6022 analog microphone as input and send the data to A2DP
+ */ 
+
+AnalogAudioStream adc;
+BluetoothA2DPSource a2dp_source;
+
+// callback used by A2DP to provide the sound data
+int32_t get_sound_data(Frame* frames, int32_t frameCount) {
+    uint8_t *data = (uint8_t*)frames;
+    int frameSize = 4;
+    size_t resultBytes = adc.readBytes(data, frameCount*frameSize);   
+    return resultBytes/frameSize;
+}
+
+// Arduino Setup
+void setup(void) {
+  Serial.begin(115200);
+
+  // start i2s input with default configuration
+  Serial.println("starting I2S-ADC...");
+  adc.begin(adc.defaultConfig(RX_MODE));
+
+  // start the bluetooth
+  Serial.println("starting A2DP...");
+  a2dp_source.set_auto_reconnect(false); 
+  a2dp_source.set_data_callback_in_frames(get_sound_data);
+  a2dp_source.start("MyMusic");  
+}
+
+// Arduino loop - repeated processing 
+void loop() {
+  delay(1000);
+}