#include <FastLED.h> #define LED_PIN_1 3 #define LED_PIN_2 6 #define LED_COUNT_1 42 #define LED_COUNT_2 7 #define BRIGHTNESS 255 #define LED_TYPE WS2812B #define COLOR_ORDER GRB CRGB leds_1[LED_COUNT_1]; CRGB leds_2[LED_COUNT_2]; void setup() { FastLED.addLeds<LED_TYPE, LED_PIN_1, COLOR_ORDER>(leds_1, LED_COUNT_1); FastLED.addLeds<LED_TYPE, LED_PIN_2, COLOR_ORDER>(leds_2, LED_COUNT_2); FastLED.setBrightness(BRIGHTNESS); } void loop() { int brightness_2 = 0; int fadeAmount = 5; for (int i = 0; i < 7680; i++) { int brightness_1 = (exp(sin(i / 50.0 * PI)) - 0.36787944) * 108.0; for (int j = 0; j < LED_COUNT_1; j++) { leds_1[j].setRGB(brightness_1, brightness_1, brightness_1); } FastLED.show(); delay(20); } }让第二个LED灯带在第一个LED灯带呼吸的状态下同时慢慢亮起

可以尝试在循环中添加对第二个LED灯带的控制，使其跟随第一个灯带的呼吸状态，并且慢慢亮起。具体代码如下：

#include <FastLED.h> 

#define LED_PIN_1     3 
#define LED_PIN_2     6 
#define LED_COUNT_1   42 
#define LED_COUNT_2   7 
#define BRIGHTNESS  255 
#define LED_TYPE    WS2812B 
#define COLOR_ORDER GRB 

CRGB leds_1[LED_COUNT_1]; 
CRGB leds_2[LED_COUNT_2]; 

void setup() { 
  FastLED.addLeds<LED_TYPE, LED_PIN_1, COLOR_ORDER>(leds_1, LED_COUNT_1); 
  FastLED.addLeds<LED_TYPE, LED_PIN_2, COLOR_ORDER>(leds_2, LED_COUNT_2); 
  FastLED.setBrightness(BRIGHTNESS); 
} 

void loop() { 
  int brightness_2 = 0; 
  int fadeAmount = 5; 

  for (int i = 0; i < 7680; i++) { 
    int brightness_1 = (exp(sin(i / 50.0 * PI)) - 0.36787944) * 108.0; 

    for (int j = 0; j < LED_COUNT_1; j++) { 
      leds_1[j].setRGB(brightness_1, brightness_1, brightness_1); 
    } 

    // 将第二个灯带的亮度设为第一个灯带的亮度
    for (int k = 0; k < LED_COUNT_2; k++) { 
      leds_2[k].setRGB(brightness_1, brightness_1, brightness_1); 
    } 

    // 逐渐增加第二个灯带的亮度
    if (brightness_2 < brightness_1) { 
      brightness_2 += fadeAmount; 
      if (brightness_2 > brightness_1) { 
        brightness_2 = brightness_1; 
      } 
      for (int k = 0; k < LED_COUNT_2; k++) { 
        leds_2[k].setRGB(brightness_2, brightness_2, brightness_2); 
      } 
    } 

    FastLED.show(); 
    delay(20); 
  } 
}

需要注意的是，这段代码中的呼吸效果是由第一个灯带控制的，第二个灯带只是跟随变化，如果需要更改呼吸效果，需要修改对第一个灯带的控制。