Internet radio and audio file player on ESP32-S3

MAJSTER XXL 221928 2371

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#2371 21845582 22 Feb 2026 11:07

DJCheester DJCheester

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Post #2371
21845582 22 Feb 2026 11:07

robgold wrote:
As a flesh-and-blood electronics engineer, however, hardware has always been closer to me than software.

Like me, I have 30 years of electronics behind me and as soon as there was an opportunity to avoid software I went into it, but software today is everywhere and systems such as ESP greatly expand the possibilities of electronics. The beginnings were difficult just uploading ready made bin hex batches with time Arduino. But software and open code has always bugged me a lot lately as it has been over a year with this radio it has taught me a lot, which I owe to everyone here.

I can't get into someone else's code and I don't know if I ever will, but with open code I can learn piece by piece how the functions work and I can change things for my own needs.

Greetings and thanks from my side are due to everyone on this topic. Thanks to the fact that we are writing there is interest, the topic is alive and well.

And of course to the Master as the creator of the first version of the radio on this channel.

Col Suspak I wonder if if he put it in the car and made noise whether it would rip the streaming, hotspot from the phone.

Regards...
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#2372 21845789 22 Feb 2026 14:42

pipikupi1979 pipikupi1979

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21845789 22 Feb 2026 14:42

I am also an electronics technician so for me wiring soldering and hardware organisation is my element soft is a bit weaker especially at this level as in Evo but it is very good motivation for development and education. So a big thank you for this project my wife after fully firing up my Evo technics said I finally made something fully functional. Robgold a can I "buy you a coffee" ? If you haven't already then maybe you should think about it. Regards
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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]