WS2811 - breathe demo for Peter Swanton

breathe.ino

#include <FastLED.h>
 // change these to match your hardware setup
 
#define LED_PIN 13                          // hardware SPI pin SCK
#define NUM_LEDS 250
#define COLOR_ORDER RGB
#define LED_TYPE WS2811
#define MAX_BRIGHTNESS 255                   // watch the power!
 
struct CRGB leds[NUM_LEDS];

void setup()
{
    LEDS.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
    FastLED.setBrightness(MAX_BRIGHTNESS);
    FastLED.clear();
    fill_solid(leds, NUM_LEDS, CRGB::White);
}

void loop () {
  
 float breath = (exp(sin(millis()/2000.0*PI)) - 0.36787944)*108.0;
 FastLED.setBrightness(breath);
 FastLED.show(); 
  
}