{"id":1255,"date":"2020-03-27T22:29:17","date_gmt":"2020-03-27T21:29:17","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=1255"},"modified":"2024-03-21T08:02:21","modified_gmt":"2024-03-21T07:02:21","slug":"1255","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2020\/03\/27\/1255\/","title":{"rendered":"A Simple Arduino Bluetooth Music Receiver Library for the ESP32"},"content":{"rendered":"

The ESP32<\/a> provides a Bluetooth A2DP API<\/a> that receives sound data e.g. from your Mobile Phone<\/strong> and makes it available via a callback method. The output is a PCM data stream <\/strong>decoded from SBC format. The documentation can be found here.\u00a0<\/a><\/p>\n

I2S<\/a> is an electrical serial bus interface standard used for connecting digital audio devices together. It is used to communicate PCM audio data <\/strong>between integrated circuits in an electronic device.<\/p>\n

So we can just feed the input from Bluetooth to the I2S<\/strong> output: An example for this A2DP Data Sink<\/strong> from Expressive can be found on Github<\/a>.<\/p>\n

Unfortunately this example did not make me happy so I decided to convert it into a simple C++ class that is very easy to use from an Arduino Software IDE.<\/a><\/p>\n

A Simple I2S Example<\/strong><\/h3>\n

Here is the simplest example which just uses the proper default settings:<\/p>\n

#include \"BluetoothA2DPSink.h\"\n\nBluetoothA2DPSink a2dp_sink;\n\nvoid setup() {\na2dp_sink.start(\"MyMusic\");\n}\n\nvoid loop() {\n}\n<\/code><\/pre>\n
This creates a new Bluetooth device with the name “MyMusic” and the output will be sent to the following default I2S pins<\/strong>:
\n– bck_io_num => GPIO 26,
\n– ws_io_num => GPIO 25,
\n– data_out_num => GPIO 22<\/p>\n
These need to be connected to an external external DAC<\/a>. You can define your own pins easily by calling the set_pin_config method.<\/p>\n
Output to the Internal DAC <\/strong><\/h3>\n
You can also send the output directly to the internal DAC of the ESP32 <\/strong>by providing the corresponding i2s_config<\/a>:<\/p>\n
#include \"BluetoothA2DPSink.h\"\n\nBluetoothA2DPSink a2dp_sink;\n\nvoid setup() {\nstatic const i2s_config_t i2s_config = {\n.mode = (i2s_mode_t) (I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),\n.sample_rate = 44100, \/\/ corrected by info from bluetooth\n.bits_per_sample = (i2s_bits_per_sample_t) 16, \/* the DAC module will only take the 8bits from MSB *\/\n.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,\n.communication_format = I2S_COMM_FORMAT_I2S_MSB,\n.intr_alloc_flags = 0, \/\/ default interrupt priority\n.dma_buf_count = 8,\n.dma_buf_len = 64,\n.use_apll = false\n};\n\na2dp_sink.set_i2s_config(i2s_config);\na2dp_sink.start(\"MyMusic\");\n\n}\n\nvoid loop() {\n}\n<\/code><\/pre>\n
The output goes now to the DAC pins G26\/G27<\/strong>.<\/p>\n
Installation<\/h3>\n
The library<\/strong> with the examples can be found on Github<\/a><\/p>\n
Conclusion<\/h3>\n
This is the perfect functionality to revive my old Technics SU-Z2 Amplifier: <\/strong>I can use it now by streaming my music from my Android Phone or IPAD. <\/strong><\/p>\n
\"\"<\/strong><\/p>\n
Initially I wanted to use the ESP32 also to stream some Internet Radios via WIFI using http – but in the end it turned out to be much simpler to use one of the many Music Apps from a Mobile Phone\u00a0 with Bluetooth as output!<\/p>\n
The only task left now is to build a casing…<\/p>\n
\"\"<\/p>\n
Next Steps<\/h3>\n
To implement some more scenarios please have a look at the examples of my audio tools library<\/a> or my related Blogs<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
The ESP32 provides a Bluetooth A2DP API that receives sound data e.g. from your Mobile Phone and makes it available via a callback method. The output is a PCM data stream decoded from SBC format. The documentation can be found here.\u00a0 I2S is an electrical serial bus interface standard used […]<\/p>\n","protected":false},"author":1,"featured_media":1307,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20,22,10],"tags":[46],"class_list":["post-1255","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-machine-sound","category-projects","tag-communications"],"yoast_head":"\nA Simple Arduino Bluetooth Music Receiver Library for the ESP32 - Phil Schatzmann<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2020\/03\/27\/1255\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Simple Arduino Bluetooth Music Receiver Library for the ESP32 - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"The ESP32 provides a Bluetooth A2DP API that receives sound data e.g. from your Mobile Phone and makes it available via a callback method. 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