/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Blink
*/

// setup函数在您按下复位或给板子通电时运行一次
void setup() {
  // 初始化数字引脚LED_BUILTIN为输出。
  pinMode(LED_BUILTIN, OUTPUT);
  // 初始化数字引脚12为输出。
  pinMode(12, OUTPUT);
  // 初始化数字引脚11为输出。
  pinMode(11, OUTPUT);
}

// loop函数会一直循环运行
void loop() {
  // 将LED_BUILTIN引脚设置为高电平
  digitalWrite(LED_BUILTIN, HIGH);
  // 等待1000毫秒
  delay(1000);
  // 将LED_BUILTIN引脚设置为低电平
  digitalWrite(LED_BUILTIN, LOW);
  // 等待1000毫秒
  delay(1000);

  // 将数字引脚12设置为高电平
  digitalWrite(12, HIGH);
  // 等待1000毫秒
  delay(1000);
  // 将数字引脚12设置为低电平
  digitalWrite(12, LOW);
  // 等待1000毫秒
  delay(1000);

  // 将数字引脚11设置为高电平
  digitalWrite(11, HIGH);
  // 等待1000毫秒
  delay(1000);
  // 将数字引脚11设置为低电平
  digitalWrite(11, LOW);
  // 等待1000毫秒
  delay(1000);
}