FastLED Example Code-NoisePlusPalette

I’m trying to understand the FastLED example code. In the “NoisePlusPalette” example code, I was attempting to make some of the pallets turn on at a specific time in milliseconds. I cannot get the pallets to change from one to another quickly enough, almost as if the resolution of time is in seconds and not milliseconds. In the “Void ChangePalettePeriodically()” function I set the pallets to turn on at 0, 4395ms, 4395ms, 6046ms, 6563ms, etc, and that’s commented in the code below. Any suggestions as to how I can get the pallets to turn on at my desired times in ms? Any advice appreciated.

#include <FastLED.h>

#define CLOCK_PIN 5
#define DATA_PIN 4
#define NUM_LEDS    248
#define BRIGHTNESS  10
#define LED_TYPE    APA102
#define COLOR_ORDER BGR
CRGB leds[NUM_LEDS];

int loop1=0;
#define UPDATES_PER_SECOND 100

// This example shows several ways to set up and use 'palettes' of colors
// with FastLED.
//
// These compact palettes provide an easy way to re-colorize your
// animation on the fly, quickly, easily, and with low overhead.
//
// USING palettes is MUCH simpler in practice than in theory, so first just
// run this sketch, and watch the pretty lights as you then read through
// the code.  Although this sketch has eight (or more) different color schemes,
// the entire sketch compiles down to about 6.5K on AVR.
//
// FastLED provides a few pre-configured color palettes, and makes it
// extremely easy to make up your own color schemes with palettes.
//
// Some notes on the more abstract 'theory and practice' of
// FastLED compact palettes are at the bottom of this file.



CRGBPalette16 currentPalette;
TBlendType    currentBlending;

extern CRGBPalette16 myRedWhiteBluePalette;
extern const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM;


void setup() {
    delay( 3000 ); // power-up safety delay
  FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  LEDS.setBrightness(BRIGHTNESS);
    
    currentPalette = RainbowColors_p;
    currentBlending = LINEARBLEND;
}


void loop()
{
          
    ChangePalettePeriodically();
   
    static uint8_t startIndex = 0;
    startIndex = startIndex + 1; /* motion speed */
    
    FillLEDsFromPaletteColors( startIndex);
    
    FastLED.show();
    FastLED.delay(1000 / UPDATES_PER_SECOND);
}

void FillLEDsFromPaletteColors( uint8_t colorIndex)
{
    uint8_t brightness = 255;
    
    for( int i = 0; i < NUM_LEDS; i++) {
        leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending);
        colorIndex += 3;
    }
}


// There are several different palettes of colors demonstrated here.
//
// FastLED provides several 'preset' palettes: RainbowColors_p, RainbowStripeColors_p,
// OceanColors_p, CloudColors_p, LavaColors_p, ForestColors_p, and PartyColors_p.
//
// Additionally, you can manually define your own color palettes, or you can write
// code that creates color palettes on the fly.  All are shown here.

void ChangePalettePeriodically()
{
    uint8_t secondHand = (millis() / 1000) % 60;
    
    static uint8_t lastSecond = 99;
    if( lastSecond != secondHand) {
        lastSecond = secondHand;
        
         if( secondHand == 0)  { SetupBlackAndWhiteStripedPalette();       currentBlending = NOBLEND; }
        // I wanted the pallet to start at 0
        
       if( secondHand >= 4395)  { currentPalette = RainbowStripeColors_p;   currentBlending = NOBLEND;  } 
        // I wanted the pallet to start at 4395ms
         
        if( secondHand >= 4992)  { currentPalette = RainbowStripeColors_p;   currentBlending = LINEARBLEND; }
       // I wanted the pallet to start at 4992ms

        if( secondHand >= 6046)  { SetupPurpleAndGreenPalette();             currentBlending = LINEARBLEND; }
         // I wanted the pallet to start at 6046ms

        if( secondHand >= 6563)  { SetupTotallyRandomPalette();              currentBlending = LINEARBLEND; }
        // I wanted the pallet to start at 6563ms

        if( secondHand >=  7200)  { currentPalette = RainbowColors_p;         currentBlending = LINEARBLEND; }
       // I wanted the pallet to start at 7200ms

        if( secondHand >= 7776)  { SetupBlackAndWhiteStripedPalette();       currentBlending = LINEARBLEND; }
       // I wanted the pallet to start at 7776

        if( secondHand >= 8293)  { currentPalette = CloudColors_p;           currentBlending = LINEARBLEND; }
         // I wanted the pallet to start at 8293ms

        if( secondHand >= 8870)  { currentPalette = PartyColors_p;           currentBlending = LINEARBLEND; }
        // I wanted the pallet to start at 8870

        if( secondHand >= 9000)  { currentPalette = myRedWhiteBluePalette_p; currentBlending = NOBLEND;  }
        // I wanted the pallet to start at 9000ms
   
 
  }
}

// This function fills the palette with totally random colors.
void SetupTotallyRandomPalette()
{
    for( int i = 0; i < 16; i++) {
        currentPalette[i] = CHSV( random8(), 255, random8());
    }
}

// This function sets up a palette of black and white stripes,
// using code.  Since the palette is effectively an array of
// sixteen CRGB colors, the various fill_* functions can be used
// to set them up.
void SetupBlackAndWhiteStripedPalette()
{
    // 'black out' all 16 palette entries...
    fill_solid( currentPalette, 16, CRGB::Black);
    // and set every fourth one to white.
    currentPalette[0] = CRGB::White;
    currentPalette[4] = CRGB::White;
    currentPalette[8] = CRGB::White;
    currentPalette[12] = CRGB::White;
    
}

// This function sets up a palette of purple and green stripes.
void SetupPurpleAndGreenPalette()
{
    CRGB purple = CHSV( HUE_PURPLE, 255, 255);
    CRGB green  = CHSV( HUE_GREEN, 255, 255);
    CRGB black  = CRGB::Black;
    
    currentPalette = CRGBPalette16(
                                   green,  green,  black,  black,
                                   purple, purple, black,  black,
                                   green,  green,  black,  black,
                                   purple, purple, black,  black );
}


// This example shows how to set up a static color palette
// which is stored in PROGMEM (flash), which is almost always more
// plentiful than RAM.  A static PROGMEM palette like this
// takes up 64 bytes of flash.
const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM =
{
    CRGB::Red,
    CRGB::Gray, // 'white' is too bright compared to red and blue
    CRGB::Blue,
    CRGB::Black,
    
    CRGB::Red,
    CRGB::Gray,
    CRGB::Blue,
    CRGB::Black,
    
    CRGB::Red,
    CRGB::Red,
    CRGB::Gray,
    CRGB::Gray,
    CRGB::Blue,
    CRGB::Blue,
    CRGB::Black,
    CRGB::Black
};



// Additionl notes on FastLED compact palettes:
//
// Normally, in computer graphics, the palette (or "color lookup table")
// has 256 entries, each containing a specific 24-bit RGB color.  You can then
// index into the color palette using a simple 8-bit (one byte) value.
// A 256-entry color palette takes up 768 bytes of RAM, which on Arduino
// is quite possibly "too many" bytes.
//
// FastLED does offer traditional 256-element palettes, for setups that
// can afford the 768-byte cost in RAM.
//
// However, FastLED also offers a compact alternative.  FastLED offers
// palettes that store 16 distinct entries, but can be accessed AS IF
// they actually have 256 entries; this is accomplished by interpolating
// between the 16 explicit entries to create fifteen intermediate palette
// entries between each pair.
//
// So for example, if you set the first two explicit entries of a compact 
// palette to Green (0,255,0) and Blue (0,0,255), and then retrieved 
// the first sixteen entries from the virtual palette (of 256), you'd get
// Green, followed by a smooth gradient from green-to-blue, and then Blue.

So what is the code doing now?

It is odd to do things the way you have this but you are never going to get the variable second hand greater than 4395 or in fact any number greater than 59. This is because of the mod 60 in the calculation.

If you want to work in milliseconds then change the calculation of the seconHand variable to millis() % 60000
And that will repeat every minute.