Added arduino files

simple-bt-receiver/simple-bt-receiver.ino

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+/**
+ * @file simple-bt-receiver.ino
+ * @author Benjamin Burkhardt
+ * @brief Simple bluetooth receiver built on ESP32 using the AudioTools library
+ * 
+ * @author Benjamin Burkhardt
+ * @copyright GPL-3.0-or-later
+ * 
+ */
+
+/*
+ * Based on examples of the AudioTools library (https://github.com/pschatzmann/arduino-audio-tools)
+ * It was combined out of the input stream in the a2dp-serial and the output stream of the generator-i2s example
+ * - streams-a2dp-serial.ino  - https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-a2dp-serial
+ * - streams-generator-i2s.ino - https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-generator-i2s
+ */
+
+/*
+ * Used partition scheme: "Minimal SPIFFS" 
+ */
+ 
+
+#include "AudioTools.h"
+#include "AudioLibs/A2DPStream.h"
+
+
+A2DPStream a2dp_in;
+CsvOutput<int16_t> out(Serial, 2);  // ASCII stream as csv
+I2SStream i2s_out;                  // I2S stream (to external DAC)
+
+StreamCopy copier(i2s_out, a2dp_in);  // copy in to out
+
+const char* a2dp_name = "<DIY Speaker's name>";
+const bool a2dp_auto_reconnect = true;
+
+
+// Arduino Setup
+void setup(void) {
+  Serial.begin(115200);
+  while (!Serial)
+    ;
+  AudioLogger::instance().begin(Serial, AudioLogger::Warning);
+
+  // start I2S
+  Serial.println("Setting up I2S...");
+  auto config_i2s = i2s_out.defaultConfig(TX_MODE);
+  config_i2s.copyFrom(a2dp_in.audioInfoOut());
+  i2s_out.begin(config_i2s);
+  Serial.println("Set up I2S!");
+
+  // start the bluetooth audio receiver
+  Serial.println("Setting up A2DP...");
+  auto config_a2dp = a2dp_in.defaultConfig(RX_MODE);
+  config_a2dp.name = a2dp_name;
+  config_a2dp.auto_reconnect = a2dp_auto_reconnect;
+  a2dp_in.begin(config_a2dp);
+  Serial.println("Set up A2DP!");
+
+  Serial.println("Started!");
+}
+
+// Arduino loop
+void loop() {
+  copier.copy();
+}