// ESP32-S2 ARGB Test

#include <Adafruit_NeoPixel.h>

#define NUMPIXELS        1
#define LED_PIN          18
Adafruit_NeoPixel pixels(NUMPIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(115200);
  pixels.begin();
  pixels.setBrightness(255); 
}

void loop() {
  Serial.println("Red");
  pixels.fill(0xff0000); //(255,0,0)
  pixels.show();
  delay(1000);

  Serial.println("Green");
  pixels.fill(0x00ff00); //(0,255,0)
  pixels.show();
  delay(1000);

  Serial.println("Blue");
  // pixels.fill(0x0000ff); // (0,0,255) Bug?
  pixels.fill(0x0000cf); // (0,0,207)
  pixels.show();
  delay(1000);

  Serial.println("White");
  pixels.fill(0xffffff); //(255,255,255)
  pixels.show();
  delay(1000);

  Serial.println("Black");
  pixels.fill(0x000000); //(0,0,0)
  pixels.show();
  delay(1000);
}
Loading
esp32-s2-devkitm-1