const int LDR_PIN = A0;
const int RED_PIN = 3;
const int GREEN_PIN = 5;
const int BLUE_PIN = 6;

void setup()

{
  Serial.begin(9600);
  pinMode(LDR_PIN, INPUT);
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void loop()
{
  int ldrValue = analogRead(LDR_PIN); // 获取光线传感器的值
Serial.println(ldrValue);
  if (ldrValue < 500) // 当环境较暗时
  {
    analogWrite(RED_PIN, 50); // 调节亮度
    analogWrite(GREEN_PIN, 50);
    analogWrite(BLUE_PIN, 50);
  }
  else // 当环境较亮时
  {
    analogWrite(RED_PIN, 255); // 调节亮度
    analogWrite(GREEN_PIN, 255);
    analogWrite(BLUE_PIN, 255);
  }

  delay(1000); // 每秒更新一次
}