PCM5102A I2S stereo DAC with ESP32

Supply 3.3-5 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
SCK	Ground	GND	System clock: connect to GND so the chip makes it from BCK
BCK	SPI clock	D25	I2S bit clock, not SPI
DIN	Input (the ESP32 drives it)	D26	I2S audio data from the ESP32
LCK	SPI chip select	D27	I2S word select (LRCK), not SPI
GND	Ground	GND
VIN	Power	3V3	3.3 V or 5 V. XSMT (solder jumper on the back) must be HIGH or the output stays muted

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);
}

Texas Instruments PCM5102A datasheet, Audio interface BCK, LRCK, DIN; SCK can be omitted (PLL from BCK); XSMT soft mute

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