#0011 NTS Radio on an ESP32-S3

ESP32-S3 internet radio device that plays NTS radio, with a button to select Channel 1 or 2. The onboard screen shows the current show. Audio is line-level from a PCM5102 into an amp.

Parts

• Adafruit ESP32-S3 TFT Feather — Wi-Fi, USB-C, 1.14 inch 240×135 ST7789 TFT. No analogue DAC on the ESP32-S3.

• Adafruit PCM5102 I2S DAC, line-level, 112dB SNR

• 12mm tactile switch

• Jumper wires

• USB-C cable (power and flash)

• Amp or speakers with a line input

Wiring

ESP32 → PCM5102:

• 3V → VIN

• GND → GND

• A0 (GPIO 18) → BCK

• A1 (GPIO 17) → WSEL

• A2 (GPIO 16) → DIN

Button:

• One side → pin 5 (silkscreen 5, above SCL)

• Other side → GND

Power:

USB-C on the ESP32. DAC VIN from Feather 3V.

Firmware

PlatformIO, Arduino, board adafruit_feather_esp32s3_tft.

• ESP32-audioI2S 2.0.6 — stream decode, I2S out

• ArduinoJson — live metadata

• Adafruit GFX + ST7789 — display

On boot: connect Wi-Fi (WiFiMulti), start Channel 1, draw channel, title, location.

Every 25 seconds: GET https://www.nts.live/api/v2/live, keep broadcast_title and location_long for the active channel.

Streams:

• Channel 1: https://stream-relay-geo.ntslive.net/stream?client=direct

• Channel 2: https://stream-relay-geo.ntslive.net/stream2?client=direct

Firmware volume is 21/21. Use the amp for level.

platformio.ini and main.cpp (Wi-Fi names and passwords replaced with placeholders):

Code (GIST)

Replace YOUR_WIFI_NAME / YOUR_WIFI_PASSWORD in the gist before flashing.

Not an official NTS product. Public live streams only.