Addressable LED Strip Fill

Using Arduino Project Guidance
1

Hi Guys,

Hopefully someone can help me with this.

I am setting up a project so that when someone pushes a button a strip of UCS1903 Led lights up in a chase and then stays on.

I have it doing that, however I would like it to be able to fade in instead of snapping the pixels on.

How would I go about this?

  #include <FastLED.h>
    #define NUM_LEDS 250
    #define DATA_PIN 4
    CRGB leds[NUM_LEDS];

    const int buttonPin = 2;
    int buttonState = 0;

    void setup() { 
       FastLED.addLeds<UCS1903B, DATA_PIN, RBG>(leds, NUM_LEDS);

       pinMode(buttonPin, INPUT_PULLUP);
   }

 void loop() {

  buttonState = digitalRead(buttonPin);

if (buttonState == HIGH) {
   for(int dot = 0; dot < NUM_LEDS; dot++) { 
            leds[dot] = CRGB::Black;
            FastLED.show();
            // clear this led for the next time around the loop
            leds[dot] = CRGB::Black;
            //delay(20);
   }
 }
if (buttonState == LOW)  {
        for(int dot = 0; dot < NUM_LEDS; dot++) { 
            leds[dot] = CRGB::Gold;
            FastLED.show();
            // clear this led for the next time around the loop
            //leds[dot] = CRGB::Gold;
            delay(2);
        }
 }
 }

Chivas_LED_Chase.ino (898 Bytes)

2

you mean something like this>>

3