// L1-002 双LED交替闪烁
// 定义两路LED引脚
int ledRed = 13;
int ledYellow = 12;

void setup() {
  // 双引脚配置为输出
  pinMode(ledRed, OUTPUT);
  pinMode(ledYellow, OUTPUT);
}

void loop() {
  // 红灯亮、黄灯灭
  digitalWrite(ledRed, HIGH);
  digitalWrite(ledYellow, LOW);
  delay(5000);

  // 红灯灭、黄灯亮
  digitalWrite(ledRed, LOW);
  digitalWrite(ledYellow, HIGH);
  delay(5000);
}