UDA1334A I2S stereo DAC with ESP32

Supply 3.3-5 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VIN	Power	3V3	Pin order varies between boards: match by the printed label. 3.3 V or 5 V
3VO	Not wired to the ESP32	—	3.3 V output of the regulator. Leave unconnected
GND	Ground	GND
WSEL	SPI chip select	D25	I2S word select (LRC), not SPI
DIN	Input (the ESP32 drives it)	D26	I2S audio data from the ESP32
BCLK	SPI clock	D27	I2S bit clock, not SPI
LOUT	Not wired to the ESP32	—	Line out left (or use the headphone jack)
AGND	Not wired to the ESP32	—	Audio ground for the line outputs
ROUT	Not wired to the ESP32	—	Line out right

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

void setup() { pinMode(26, OUTPUT); }  // DIN

void loop() {
  digitalWrite(26, HIGH);
  delay(500);
  digitalWrite(26, LOW);
  delay(500);
}

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.