Internet radio and audio file player on ESP32-S3

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#2551 21865854 19 Mar 2026 12:20

robgold robgold

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Post #2551
21865854 19 Mar 2026 12:20

>>21865827 That's why an oscilloscope is essential, because you would immediately check if those 3kHz (quite a lot for tests, it's better to start from 1k) enter the PCM correctly. As far as DSP is concerned, you should be interested in the TAS (TI TAS 5805) which I threw into the radio here; they have a very extensive DSP in them.
As for input/output handling and conversion to i2s, I recommend the PCM9211 used in a lot of gear. I will be figuring out communications with it in the near future.
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#2552 21865978 19 Mar 2026 15:20

kula350 kula350

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Post #2552
21865978 19 Mar 2026 15:20

Thanks to MajsterXXL for the radio heart.

/ Encoder:
Set up for my big scoop.
1. 1 pos SW - switching between Player/Radio. Compare remote control buttons for IR in data/IRcodes.h. Attached original with description.
2. 1 pos. twist - station/folder selection.
3. 2 pos. after 1.2s holding SW - volume. (Doesn't matter if 20, 21, always range 0-100%, here jet 5 with 20 as default. I will put the gain on full anyway)
4. 3 pos. after 2s holding SW - Off/On. Compare remote control buttons for IR in data/IRcodes. Attached original with description.
Colours can be selected in the colours.txt file. By deleting the colors.txt file or renaming it, the radio enters the colours contained in the program code.
// VUmeters (the analyser) has a vu.txt file on the SD card, in which 7 vumeters can be selected by specifying their numbers from 0 to 6.

the // Weather is set to ORE, can be easily adjusted in the program code by changing, line about 939, to:
?latitude=50.25&longitude=18.85.
There must be 4 digits and a dot in the middle. Here it is set to 50.25 and 18.85, check on Google maps what the latitude and longitude is for you. Round up to this format.

// Pins:
Pin #1 added - on/off. It is 1 when started, 0 when switched off. The rest of the pins are as they were. It is switched on with the encoder as On/Off, from the IR remote control the code "rcCmdOff". From the remote control only off, the return does not need, because there will be a mechanism to switch on the whole device with the radioplayer. This code will receive another device, depending on how it is set, the corresponding configuration will switch on.

// IR pins described in data/IRcodes.h
// Library arduinoFFT added. (someone asked)

// This is not the end of this radio for me, it will be expanded with more segments according to my needs and assumptions.
Improvements welcome. I don't limit the work of MajstraXXL to dissemination, but I don't want mine to get tangled up on FB in the Yoradio group, due to being treated like an intruder, to say no more.... Therefore, please do not pass this on the Yoradio group on FB . Apologies for errors.

Attachments:

1 ESP32_majster_v3-main.rar (134.62 MB) You must be logged in to download this attachment.
#2553 21866028 19 Mar 2026 20:55

DJCheester DJCheester

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Post #2553
21866028 19 Mar 2026 20:55

Kula / Majster I was thinking about the player function so that you can delete songs from the SD card because sometimes it would prztdało from the remote control when you are lying down and listening and a song is already boring.

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Topic summary

The discussion centers on the development of an internet radio and audio file player based on the ESP32-S3-WROOM-1 module, featuring a custom-designed prototype PCB with OLED display and user controls including rotary encoders and buttons. Key challenges addressed include pin spacing discrepancies in the ESP32-S3 module footprint, integration of Wi-Fi connectivity with dynamic station list updates, and handling of Polish character encoding on the OLED display. The project uses Arduino IDE (version 2.3.2) with ESP-IDF support and requires enabling PSRAM. Audio playback supports MP3, AAC, and FLAC streams, with the ESP32-audioI2S library recommended over the incompatible Audio library. Users reported issues with SPI MISO pin assignment causing bootloader conflicts, resolved by reassigning MISO to pin 35. The project incorporates WiFiManager for network configuration, EEPROM and SD card storage for saving last played station and settings, and includes plans for tone control via an external KA2107 equalizer and a CS8673 amplifier module. Problems with encoder input stability and memory limitations for Bluetooth A2DP on ESP32-S3 were noted. The community suggested alternatives like KaRadio and ESP32-MiniWebRadio projects. Debugging tips include serial terminal logs for HTTP errors and flash memory erasure to resolve boot loops. The project is open-source on GitHub, encouraging forks and modifications. Additional features under development include browser-based updates, directory navigation, and potential audio recording to SD card.
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Internet radio and audio file player on ESP32-S3

FAQ

TL;DR: DIY ESP32-S3 radio/player pulls 100 internet stations per bank and boots in ≈3 s; “building it on a breadboard is priceless learning” [Elektroda, MAJSTER XXL, post #20998118] Average parts cost ≈ €55. Why it matters: open-hardware keeps your music device up-to-date and repairable.

Quick Facts

• Core: ESP32-S3-WROOM-1-N16R8, 240 MHz dual LX7, 16 MB Flash, 8 MB PSRAM [Elektroda, MAJSTER XXL, post #20998118] • Display options: 2.42” 128×64 OLED (SSD1309) or 3.12” 256×64 OLED (SSD1322) SPI-4-wire [Elektroda, MAJSTER XXL, post #21331457] • Station banks: 1–15; up to 100 URLs each, fetched from GitHub on power-up [Elektroda, MAJSTER XXL, post #20998118] • Audio path: I²S → PCM5102A DAC, 16-24 bit / 44.1-96 kHz; FLAC/MP3/AAC via ESP32-audioI2S [Schreibfaul, 2023] • Typical BOM: ESP32 (€10) + OLED (€15) + PCM5102A (€6) + encoders & buttons (€5) + misc PCB/box (€20)

What hardware do I need for the v2 ESP32 radio?

Minimum: 1 × ESP32-S3-WROOM-1-N16R8 module, 1 × SSD1322 256×64 SPI OLED, 1 × PCM5102A I²S DAC, micro-SD reader, two rotary encoders with push-buttons, 5 V/3 A supply, and eight jumper wires [Elektroda, MAJSTER XXL, post #21331457]

How do I switch the 256×64 OLED to 4-wire SPI?

Solder a single jumper so that pads R5 and R8 are bridged; this disables the default parallel bus and enables 4-wire SPI mode [Elektroda, MAJSTER XXL, post #21376526]

Why does the sketch hang after “Brak połaczenia z serwerem pogody”?

OpenWeatherMap now requires an API 3.0 key and HTTPS; register, copy the 32-character key, and update the URL to http://api.openweathermap.org/data/2.5/weather?q=YourCity&appid=YOURKEY [Elektroda, gangliu2018, post #21350398]

Large FLAC files reset my ESP32—what’s the fix?

Files ≥ 30 MB can overrun the audio buffer; split albums, reduce sample-rate, or compile ESP32-audioI2S with larger ring-buffer (inputBufferSize ≥ 320 kB) [Elektroda, MAJSTER XXL, post #21338559]

How can I store the last played station?

Current build writes bank/station numbers to SD-card files (station_nr.txt, bank_nr.txt). On boot the sketch reloads them; no EEPROM wear and works even after power loss [Elektroda, MAJSTER XXL, post #21365665]

I see “Hostaddress is not valid” in Serial—why?

Your station string contains the name plus URL. The parser now trims everything before “http” or “https”; update to commit eba3d0c6 or ensure each line starts with the protocol [Elektroda, MAJSTER XXL, post #21359014]

How do I compile without SD-card attached?

Comment out writeSDCard() and readSDStations() calls; otherwise the code polls CS pin 47 and stops playback when the reader is absent [Elektroda, MAJSTER XXL, post #21358386]

Can I control the radio with just two encoders?

Yes. Short-press selects menu, long-press (≈3 s) toggles bank/player; wheel scrolls lists. A joystick or 5-way tact switch can add up/down/OK if you want quick access [Elektroda, MAJSTER XXL, post #21375300]

What is the typical boot and station-load time?

Cold boot to music ≤ 3 s; downloading an unseen 100-URL bank adds 1–4 s depending on Wi-Fi (–65 dBm RSSI) [Elektroda, robgold, post #21369916]

Edge case: the folder “System Volume Information” appears in the player list.

Filter the directory array so paths containing that name are skipped; otherwise the player shows a blank entry and fails to open files [Elektroda, robgold, post #21372146]

How do I update station lists?

Fork https://github.com/sarunia/ESP32_stream
Edit any bank*.txt online (42-char name + URL per line).
Save; the radio auto-downloads at next reboot or when you pick “Update banks”. “GitHub editing is the fastest workflow.” [Elektroda, MAJSTER XXL, post #21329513]

Can I print a ready enclosure?

STL and SketchUp files for a 160 × 40 mm aluminium-profile case (front bezel, encoder mounts, SD slot) are published in fork evo2 / cad directory [Elektroda, robgold, post #21373875]

Which libraries and versions compile cleanly?

• ESP32 board package 3.0.7 • ESP32-audioI2S 1.9.1 • U8g2 2.34.22 • Adafruit_SH110X 2.1.11 • WiFiManager 2.0.17 (change byte→uint8_t in DNS_PORT) [Elektroda, simw, post #21288589]

My OLED is blank although SPI works—what next?

Verify VCC 5 V (200 mA peak); set U8G2_R2 rotation; check that SCK, MOSI, CS, DC, RES go to GPIO 38, 39, 42, 40, 41 respectively on DevKitC-1 board [Elektroda, robgold, post #21376698]