Could someone explain the timebase and phase offset variables in beatsin8():

Archive FastLED Archive
,
1

Could someone explain the timebase and phase offset variables in beatsin8(): LIB8STATIC uint8_t beatsin8( accum88 beats_per_minute, uint8_t lowest = 0, uint8_t highest = 255,
uint32_t timebase = 0, uint8_t phase_offset = 0)

I am trying to trigger a light at a specific point, but I want it to start at lowest brightness. I was hoping that resetting the timer through:

#define USE_GET_MILLISECOND_TIMER 1

and

uint32_t get_millisecond_timer()
{
return millis() - resetTime;
}

would do the trick but it seems to reset to the top of the sine curve (full brightness), not the bottom (low brightness) which is what I’m looking for.

2

Setting the time base to millis() should zero out the beat.
uint8_t wave = beatsin8(60, 0, 255, millis());

Then try adding 64, 128, or 192 and see if that gives what you want.
uint8_t wave = beatsin8(60, 0, 255, millis(), 128);

3

feeding millis() inside beatsin8 seems to just freeze (or keep resetting) the beat, but using “USE_GET_MILLISECOND_TIMER 1” and 192 as phase shift seems to give me what I was seeking.

Thanks for the help!

4

i’m using uint8_t beat1 = beatsin8( BPM, DIMMEST, BRIGHTEST,0,192);

so 0 for timebase