#include <FastLED.h>

#define LED_PIN     5
#define NUM_LEDS    50
#define BRIGHTNESS  64
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];



void setup() {
    FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
    FastLED.setBrightness( BRIGHTNESS);
}


void loop(){
    CRGB colA = {255,32,96}; // this will ne the colour when blendval = 0
    CRGB colB = {32,128,192}; // "" blendVal = 255
    uint8_t blendVal; // this defines how much to blend between  col a and col b (0-255)
    blendVal = beat8(10); // Sawtooth wave at 10 bpm (pretty slow )
    blendVal = ease8InOutApprox(blendVal); // this will slow the transition at either end, if you're into that 
    CRGB blendedCol = colA.lerp8(colB ,blendVal ); // create new interpolated  CRGB obj from colA and ColB 
    FillLEDs (blendedCol);
    FastLED.show();
    
}

void FillLEDs( CRGB newCol)
{
    uint8_t brightness = 255;

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