This is a quick example of a NodeMCU ESP8266 connected to a WS2812 RGB LED. It uses the Blynk.cc Android app and the corresponding Blynk Iibrary to allow the LED to be controlled via a smartphone. It also uses the FastLED library to interface with the WS2812 RGB LED. See the demo video here: https://www.youtube.com/watch?v=Bb_ayiVslMg&start=0&au…

ESP_Blynk_RGB_LED_demo.ino

#define BLYNK_PRINT Serial  // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include "FastLED.h"

#define LED_PIN     4 // GPIO pin for RGB LEDs.
#define NUM_LEDS    1 // Number of LEDs connected.
#define BRIGHTNESS  64 // Default LED brightness.
#define LED_TYPE    WS2812
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];

int r = 0;
int g = 0;
int b = 0;

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "blynk_auth_token_here";

void setup()
{
  // power-up safety delay
  delay( 3000 );

  Serial.begin(9600);
 
  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalSMD5050 );
  FastLED.setBrightness( BRIGHTNESS );

  Blynk.begin(auth, "ssid", "password");
}

// This assumes there is a Blynk RGB widget writing data to virtual pin V1.
BLYNK_WRITE(V1)
{
  r = param[0].asInt();
  g = param[1].asInt();
  b = param[2].asInt();
}

void loop()
{
  Blynk.run();
  FastLED.clear();
  leds[0] = CRGB(r, g, b);
  FastLED.show();
}

how about the WS2801 LED strips, how the #define LED_PIN works?

thanks