WS2812B LED strip with Teensy 4.1

Wiring for the WS2812B addressable LED strip on the Teensy 4.1 (MIMXRT1062DVJ6B, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

WS2812B LED strip pin	Role	Teensy 4.1 pin	Notes
5V	Power	3V	Use 3V for a few LEDs; a separate 5 V supply for more (up to 60 mA per LED)
DIN	Input to the part	2 (GPIO_EMC_04)	Data in. Add a 330 Ω resistor; a 3.3 V to 5 V level shifter makes it reliable
GND	Ground	G

Check before you power it on

Supply: 3.3 V from the 3V pin.
Motors, servos, relays and LED strips can draw more current than the Teensy 4.1’s pins or USB can give. Power them separately and connect the grounds together.

Test code (Arduino)

// Library: Adafruit NeoPixel
#include <Adafruit_NeoPixel.h>

Adafruit_NeoPixel strip(8, 2, NEO_GRB + NEO_KHZ800);  // 8 LEDs

void setup() {
  strip.begin();
  strip.setBrightness(40);  // keep it low when powered from USB
}

void loop() {
  for (int i = 0; i < strip.numPixels(); i++) {
    strip.clear();
    strip.setPixelColor(i, strip.Color(0, 80, 255));
    strip.show();
    delay(100);
  }
}

Arduino board: teensy:avr:teensy41. Press the white program button once if the upload waits for the board.

Questions

Which Teensy 4.1 pins do I use for the WS2812B LED strip?

5V → 3V, DIN → 2 (GPIO_EMC_04), GND → G.

Does the WS2812B LED strip work with the Teensy 4.1 at 3.3 V?

Yes: the WS2812B LED strip runs at 5 V and the Teensy 4.1 uses 3.3 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Teensy 4.1 pinout · WS2812B addressable LED strip: all pins and data

The WS2812B LED strip on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico

Other parts on the Teensy 4.1

BME280 BMP280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20