Create a new Project

1. Open the Arduino IDE
2. Click on Tools Menu
3. Click on the Managa Libraries
4. Wait for it to load
5. In the 3rd Box at the top ( the search box )
6. Type "FastLed"
7. When it appaears in the Box below select the "FastLED" by Daniel Garcia
8. Chose the latest version and click Install
9. Click on the File Menu
10. Then New
11. Highlight everything ( By Pressing Command-A )
12. Paste the following code

#define FASTLED_ESP8266_NODEMCU_PIN_ORDER


#include <FastLED.h>

#define LED_PIN     1
#define NUM_LEDS    144

CRGB leds[NUM_LEDS];

void setup() {

  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

}

void loop() {
  int i = 0;
  for (i = 0; i <= NUM_LEDS ; i++) {
  leds[i] = CRGB ( 255, 255, 255);
  FastLED.show();
  delay(10);
  }
}

Save the Program

1. Click on the File Menu again
2. Then Chose Save As
3. Type in "Turn on All Leds"

Upload the Sketch

1. Click on the Sketch Menu
2. Then Upload.