WS2812B addressable LED strip with ESP32

Supply 5 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
5V	Power	VIN	Use VIN for a few LEDs; a separate 5 V supply for more (up to 60 mA per LED)
DIN	Input (the ESP32 drives it)	D25	Data in. Add a 330 Ω resistor; a 3.3 V to 5 V level shifter makes it reliable
GND	Ground	GND

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.

Each LED draws up to about 60 mA at full white: 30 LEDs need about 1.8 A, more than USB gives. Power the strip from its own 5 V supply and connect the grounds. (Adafruit NeoPixel Überguide, Powering NeoPixels)
Put a 300 to 500 Ω resistor in the data line and a large capacitor (about 1000 µF) across the strip’s supply. (Adafruit NeoPixel Überguide, Best practices)
on 3.3 V boards: At 5 V the data input needs at least 0.7 × 5 V = 3.5 V to read HIGH. A 3.3 V board often works but not always: a level shifter (74AHCT125) makes it reliable. (Worldsemi WS2812B datasheet, Electrical characteristics: VIH = 0.7 VDD)

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.