// 七彩灯 (共阴极、公共级接地)
int r_pin = 10;
int g_pin = 11;
int b_pin = 12;
int led_val = 0;    

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S3!");

  // 七彩 led 灯
  pinMode(r_pin, OUTPUT);
  pinMode(g_pin, OUTPUT);
  pinMode(b_pin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  //delay(10); // this speeds up the simulation

  // 慢慢变红色
  for (led_val = 255; led_val > 0; led_val--)  // 循环，减少val值从255到0
  {
    analogWrite(r_pin, 255 - led_val);        // 改变红色LED的亮度（逐渐减小）
    analogWrite(g_pin, 0);                    // 改变绿色LED的亮度（逐渐增加）
    analogWrite(b_pin,0);                     // 改变蓝色LED的亮度（逐渐增加）
    delay(3);                                 // 延迟30毫秒
  }
  // 慢慢变绿色
  for (led_val = 255; led_val > 0; led_val--)
  {
    analogWrite(r_pin, 0);
    analogWrite(g_pin, 255 - led_val);
    analogWrite(b_pin,0);
    delay(3);
  }
  // 慢慢变蓝色
  for (led_val = 255; led_val > 0; led_val--)
  {
    analogWrite(r_pin, 0);
    analogWrite(g_pin, 0);
    analogWrite(b_pin, 255 - led_val);
    delay(3);
  }
}