WS2812B single RGB LED module with ESP32

Supply 5 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
5V	Power	VIN	Datasheet range 3.5 to 5.3 V. At 3V3 it often works, blue is dimmer
GND	Ground	GND
DIN	Input (the ESP32 drives it)	D25	Data in. At 5 V supply a level shifter makes it reliable
DOUT	Not wired to the ESP32	—	Data out to the next LED

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

This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.

void setup() { pinMode(25, OUTPUT); }  // DIN

void loop() {
  digitalWrite(25, HIGH);
  delay(500);
  digitalWrite(25, LOW);
  delay(500);
}

Worldsemi WS2812B datasheet, Supply 3.5 to 5.3 V; data input high level 0.7 × VDD

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