02 LED的闪烁、模拟交通灯

LED的闪烁

//板子上接了一个测试用的LED，接输出引脚13端口

#define LED_PIN 13  
  
// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_PIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_PIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);                       // 等待500毫秒
  digitalWrite(LED_PIN, LOW);    // turn the LED off by making the voltage LOW
  delay(500);                       // 等待500毫秒
}

作业：

模拟交通灯