Code for Arduino to read data from serial and display it on a led strip

LedStrip.ino

#include "FastLED.h"
#define NUM_LEDS 300
#define DATA_PIN 3
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setTemperature(Tungsten100W);
  FastLED.setBrightness(30);

  for(int i = 0; i < NUM_LEDS; i++)
  {
    leds[i] = CRGB::Black;
  }

  FastLED.show();
  Serial.begin(1000000);
  delay(150);
  Serial.println();
}

void loop()
{
  while(Serial.available())
  {
    FastLED.setBrightness(slowRead());

    for(int i = 0; i < NUM_LEDS; i++)
    {
      int r = slowRead();
      int g = slowRead();
      int b = slowRead();

      if(r + g + b == 0)
      {
        leds[i] = CRGB::Black;
      }
      else
      {
        leds[i] = CRGB(r, g, b);
      }
    }

    FastLED.show();
    Serial.println();
  }
}

int slowRead()
{
  while(Serial.available() <= 0);
  return Serial.read() & 0xFF;
}