#include <FastLED.h> #define LED_PIN 3 #define LED_COUNT 42 #define BRIGHTNESS 255 #define LED_TYPE WS2812B #define COLOR_ORDER GRB CRGB leds[LED_COUNT]; void setup() { FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, LED_COUNT); FastLED.setBrightness(BRIGHTNESS); } void loop() { int brightness = 0; int fadeAmount = 5; while (brightness <= 255) { for (int i = 0; i < LED_COUNT; i++) { leds[i].setRGB(brightness, brightness, brightness); } FastLED.show(); brightness += fadeAmount; delay(25); } delay(2000); while (brightness >= 0) { for (int i = 0; i < LED_COUNT; i++) { leds[i].setRGB(brightness, brightness, brightness); } FastLED.show(); brightness -= fadeAmount; delay(25); } }里面的错误

这段代码的错误在于，在第二个while循环中，`delay(25)`应该放在`brightness -= fadeAmount;`语句的后面，而不是前面。这会导致第二个while循环中的LED灯在减少亮度时出现暂停，而不是逐渐减少亮度。

以下是更正后的代码：

#include <FastLED.h> 

#define LED_PIN     3 
#define LED_COUNT   42 
#define BRIGHTNESS  255 
#define LED_TYPE    WS2812B 
#define COLOR_ORDER GRB 

CRGB leds[LED_COUNT]; 

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

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

  while (brightness <= 255) { 
    for (int i = 0; i < LED_COUNT; i++) { 
      leds[i].setRGB(brightness, brightness, brightness); 
    } 
    FastLED.show(); 
    brightness += fadeAmount; 
    delay(25); 
  } 
  delay(2000); 

  while (brightness >= 0) { 
    for (int i = 0; i < LED_COUNT; i++) { 
      leds[i].setRGB(brightness, brightness, brightness); 
    } 
    FastLED.show(); 
    brightness -= fadeAmount; 
    delay(25); 
  } 
}

现在，第二个while循环中的LED灯应该逐渐变暗，而不会出现闪烁或暂停的情况。