Hi Sid,

welcome to the forum! 😊 

I also notice that you lock "if(Stop==LOW)" inside the IF-loop where you test for Stop==HIGH - so that condition will never be reached (if I'm reading this right - note: always a good idea to attach the INO file to your post in the future, but as a new user you will have to post a few legit posts first before you can do that).

So example this part of the code: the bold red code will never be executed, since in this section Stop==HIGH.

if (Stop == HIGH) {
  for (int i = 0; i <= (NUM_LEDS / 2 - 1); ++i) {
    leds[i] = CRGB(red, green, blue);
    leds[NUM_LEDS - i - 1] = CRGB(red, green, blue);
    delay(SpeedDelay);
    FastLED.show();
  }
 
  if (Stop == LOW) {
    FastLED.clear();
  }
}

Now you could move that IF outside of that initial IF-loop, but then this would set the LEDs to black each time - not what you had in mind.
So to avoid all that, I'd probably modify the colorSwpie function a little bit, since the leds are all turned off when all 3 (left, right, stop) are not HIGH.

Tip: You can use shorter colors notations, see the FastLED color reference list if you'd like to use those (not required of course, but it does make the code more readable if you use just a few basic colors). For example  CRGB(0x00,0x00,0x00) = CRGB::Black   and   CRGB(0xFF,0xFF,0x00) = CRGB::Yellow. 😊 

Also not sure if required, but I think you have to do a FastLED.show() after a FastLED.clear(). I could be wrong though.

So you could do something like this (I removed the speedDelay since it didn't have much of a purpose there):

!! Don't forget:
You will have to add the beginning of your code (#defines, #include, int's and void setup()) - since this code was a little incomplete, probably because I tried putting it in code format in your post.
The bold parts of the code are my changes.

...
#define BrakeDelay 150
#define BlinkerDelay 60
...

void loop() {
  Stop = digitalRead(Pin1);
  Left = digitalRead(Pin2);
  Right = digitalRead(Pin3);
   
  colorWipe(CRGB::Yellow);
  colorWipe(CRGB::Black);
}

void colorWipe(CRGB WipeColor) {

  if (Stop == HIGH) // brake - outsides to center
  {
    for (int i = 0; i <= (NUM_LEDS / 2 - 1); ++i) 
    {
      leds[i] = WipeColor;
      leds[NUM_LEDS - i - 1] = WipeColor;
      delay(BrakeDelay);
      FastLED.show();
    }
  } 
  else if (Right == HIGH)  // right turn - right to center
  {
    for (int i = NUM_LEDS / 2; i < NUM_LEDS; i++) 
    {
      leds[i] = WipeColor; // removed the "mirror" leds
      FastLED.show();
      delay(BlinkerDelay); // change the number here to change the speed of the LEDs
    }
  } 
  else if (Left == HIGH) //left turn - left to center
  {
    for (int i = NUM_LEDS / 2 - 1; i >= 0; i--) 
    { 
      leds[i] = WipeColor; // removed the "mirror" leds
      FastLED.show();
      delay(BlinkerDelay); // change the number here to change the speed of the LEDs
    }
  }
  else
  {
    FastLED.clear();
    FastLED.show();
  }
  
}

I couldn't resist so I made another modification, so Stop becomes red and Left/Right remains yellow (note: I have not tested this with switches).

...
#define BrakeDelay 150
#define BlinkerDelay 60
...

void loop() {
  Stop = digitalRead(Pin1);
  Left = digitalRead(Pin2);
  Right = digitalRead(Pin3);

  if( (Stop==HIGH) || (Left==HIGH) || (Right==HIGH))
  {
    if(Stop==HIGH) 
    {
      colorWipe(CRGB::Red);
    }
    else
    {
      colorWipe(CRGB::Yellow);
    }
    
    colorWipe(CRGB::Black);
  }
  else
  {
    FastLED.clear();
    FastLED.show();
  }
}

void colorWipe(CRGB WipeColor) {

  if (Stop == HIGH) // brake - outsides to center
  {
    for (int i = 0; i <= (NUM_LEDS / 2 - 1); ++i) 
    {
      leds[i] = WipeColor;
      leds[NUM_LEDS - i - 1] = WipeColor;
      delay(BrakeDelay);
      FastLED.show();
    }
  } 
  else if (Right == HIGH)  // right turn - right to center
  {
    for (int i = NUM_LEDS / 2; i < NUM_LEDS; i++) 
    {
      leds[i] = WipeColor; 
      FastLED.show();
      delay(BlinkerDelay); 
    }
  } 
  else if (Left == HIGH) //left turn - left to center
  {
    for (int i = NUM_LEDS / 2 - 1; i >= 0; i--) 
    { 
      leds[i] = WipeColor; 
      FastLED.show();
      delay(BlinkerDelay); 
    }
  }
}

And another note: this all can be done more efficient, but I think this should do what you want it to do, 😊 

p.s. this is a related post for a blinker in this forum, and the result of that conversation can also be found on GitHub.
It is missing the stop/brake though.

@hans Hello Hans,

thank you for taking the time to look at the my code.

I applied your suggestions and it seems to be working as desired.

thanks again

Awesome! Good to hear that! 👍 

Enjoy the holidays and have a great new year! 😉 

@hans

Hello again

I need another favor to ask. I need to make some changes so that when the Hazard light is on ( both left and right turn signals are flashing ) , the LEDs stay off even when the brake is on. other words, the turn signal effect should only work when the left or right turn signal is on. brake should not have any effect when either doing turn signal or the hazard

I could not figure out how to make this change so it wont affect other functions of the code.

would you please kindly help me with that?

thanks

Let me see if I understand this correctly; so the effect should only work for turning left OR turning right?

In that case I'd change this line (in void loop() ):

if( (Stop==HIGH) || (Left==HIGH) || (Right==HIGH))

to something like this:

if( (Stop==HIGH) || ( (Left==HIGH) && (Right!=HIGH) ) || ( (Right==HIGH) && (Left!=HIGH) )

So only show the effect when stop is high (since you mentioned that stop should do anything, you may want to remove that), and only when just going LEFT (and not RIGHT), or going RIGHT (and not LEFT)

Without STOP:

if( ( (Left==HIGH) && (Right!=HIGH) ) || ( (Right==HIGH) && (Left!=HIGH) )

@hans

I tried your suggestions but it threw up an error for each.

I have a better suggestion . can the code from video below be modified to just have the right, left and brake effect with brake effect of my code ( Leds from out to center and turning off in same way just for the brake mode and not any other combinations. meaning in hazard + brake or brake + left or brake + right the number of leds for brake can stay solid.

please refer to this video , the code can be downloaded form the description of the video

https://www.youtube.com/watch?v=-kA0ffAG03A&t=122s

thank you

What kind of error did you get?

As for adapting the code from that video (which looks pretty cool by the way):

You see in the code that Hasitha (the developer) made functions for each of the effects (at the end of the code).
Simply do not call the ones you do not need, and modify the ones you'd like modified.
Shouldn't take too much effort.

Note: For reference and convenience, I've uploaded the code that goes with the video ... just incase