#include <FastLED.h>

#define NUM_STRIPS 4
//----------------------Here you can change the number of LEDs for each strip--------------------
#define NUM_LEDS_1 50
#define NUM_LEDS_2 50
#define NUM_LEDS_3 50
#define NUM_LEDS_4 50

// defining LED strip pins
#define LED_PIN_1 2
#define LED_PIN_2 3
#define LED_PIN_3 4
#define LED_PIN_4 5

// defining Button pins
int Btn1=14, Btn2=15;

int Strp1=0, Strp2=1 ,Strp3=2  ; 
int D1=10, D2=50, D3=50;   
int i1, i2,i3; 
unsigned long prev1, prev2,prev3;
int P1=2, P2=4,P3=4;

CRGB leds[NUM_STRIPS][50];

void setup() {
  FastLED.addLeds<WS2812B, LED_PIN_1, GRB>(leds[0], NUM_LEDS_1);
  FastLED.addLeds<WS2812B, LED_PIN_2, GRB>(leds[1], NUM_LEDS_2);
  FastLED.addLeds<WS2812B, LED_PIN_3, GRB>(leds[2], NUM_LEDS_3);
  FastLED.addLeds<WS2812B, LED_PIN_4, GRB>(leds[3], NUM_LEDS_4);
  
  FastLED.setBrightness(50);

  pinMode(Btn1, INPUT_PULLUP);
  pinMode(Btn2, INPUT_PULLUP);  
}

void loop() {
//-----------------------------------Reading Button 1---------------------
// Strip_1(); 
// Strip_2();
// Strip_3();

 for(int j=0; j<NUM_LEDS_1; j++)
      {leds[Strp1][j] = CRGB::Red;}       
      FastLED.show();
      delay(50);

}

void Strip_1()
{    
    if (i1 < (NUM_LEDS_1/P1)) 
    {
      if (millis()-prev1<D1)
      {
      for(int j=i1*P1; j<(i1*P1)+P1; j++)
      {leds[Strp1][j] = CRGB::Red;}       
      FastLED.show();
    }
      else if (millis()-prev1>D1)
      {
      for(int j=i1*P1; j<(i1*P1)+P1; j++)
      { leds[Strp1][j] = CRGB::Black;}
      FastLED.show(); prev1=millis(); 
      i1++;
      if (i1==(NUM_LEDS_1/P1)) i1=0;
      } } 
      
      }

void Strip_1_OFF()
{ for (int j = 0; j < NUM_LEDS_1; j++) {
     leds[Strp1][j] = CRGB::Black;}
     FastLED.show();  }  



void Strip_2()
{    
    if (i2 < (NUM_LEDS_2/P2)) 
    {
      if (millis()-prev2<D2)
      {
      for(int j=i2*P2; j<(i2*P2)+P2; j++)
      {leds[Strp2][j] = CRGB::Red;}       
      FastLED.show();
    }
      else if (millis()-prev2>D2)
      {
      for(int j=i2*P2; j<(i2*P2)+P2; j++)
      { leds[Strp2][j] = CRGB::Black;}
      FastLED.show(); prev2=millis(); 
      i2++;
      if (i2==(NUM_LEDS_2/P2)) i2=0;
      } } 
      
      }

void Strip_2_OFF()
{ for (int j = 0; j < NUM_LEDS_2; j++) {
     leds[Strp2][j] = CRGB::Black;}
     FastLED.show();  }
 


 void Strip_3()
{    
    if (i3 < (NUM_LEDS_3/P3)) 
    {
      if (millis()-prev3<D3)
      {
      for(int j=i3*P3; j<(i3*P3)+P3; j++)
      {leds[Strp3][j] = CRGB::Red;}       
      FastLED.show();
    }
      else if (millis()-prev3>D3)
      {
      for(int j=i3*P3; j<(i3*P3)+P3; j++)
      { leds[Strp3][j] = CRGB::Black;}
      FastLED.show(); prev3=millis(); 
      i3++;
      if (i3==(NUM_LEDS_3/P3)) i3=0;
      } } 
      
      }

void Strip_3_OFF()
{ for (int j = 0; j < NUM_LEDS_3; j++) {
     leds[Strp3][j] = CRGB::Black;}
     FastLED.show();  }