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libraries/audio-tools/examples/examples-communication/http-client/streams-url_mp3-analog/README.md

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+# Streaming Radio Player
+
+We just play a streamed radio station which provides the audio as mp3 and output the result via I2S via the built in DAC
+
+An ESP32 was used to test this sketch.
+
+### Output Device: Piezo Electric Element
+
+To test the output I am using a piezo electric element
+
+![DAC](https://pschatzmann.github.io/Resources/img/piezo.jpeg)
+
+It should also be possible to connect a headphone to the output pins...
+
+
+On the ESP32 the output is on the Pins GPIO26 and GPIO27
+
+| PIEZO     |  ESP32
+| --------| ---------------
+| +       |  GPIO25 / GPIO26
+| -       |  GND
+
+

libraries/audio-tools/examples/examples-communication/http-client/streams-url_mp3-analog/streams-url_mp3-analog.ino

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+/**
+ * @file streams-url_mp3-out.ino
+ * @author Phil Schatzmann
+ * @brief decode MP3 stream from url and output it on I2S
+ * @version 0.1
+ * @date 2021-96-25
+ * 
+ * @copyright Copyright (c) 2021
+ */
+
+// install https://github.com/pschatzmann/arduino-libhelix.git
+
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include "AudioTools/Communication/AudioHttp.h"
+
+
+URLStream url("ssid","password");
+AnalogAudioStream out; // final output of decoded stream
+EncodedAudioStream dec(&out, new MP3DecoderHelix()); // Decoding stream
+StreamCopy copier(dec, url); // copy url to decoder
+
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  // setup out
+  auto config = out.defaultConfig(TX_MODE);
+  out.begin(config);
+
+  // setup I2S based on sampling rate provided by decoder
+  dec.begin();
+
+// mp3 radio
+  url.begin("http://stream.srg-ssr.ch/m/rsj/mp3_128","audio/mp3");
+
+}
+
+void loop(){
+  copier.copy();
+}