使用 millis() 實現無阻塞式閃爍

這非常接近 arduino 文件的一個例子 ：

// set constants for blinking the built-in LED at 1 Hz
#define OUTPIN LED_BUILTIN
#define PERIOD 500  // this is in milliseconds

int ledState = LOW;

// millis() returns an unsigned long so we'll use that to keep track of time
unsigned long lastTime = 0;

void setup() {
  // set the digital pin as output:
  pinMode(OUTPIN, OUTPUT);
}

void loop() {
  unsigned long now = millis();
  if (now - lastTime >= PERIOD) // this will be true every PERIOD milliseconds
  {
    lastTime = now;
    if (ledState == LOW)
    {
      ledState = HIGH;
    }
    else
    {
      ledState = LOW;
    }
    digitalWrite(OUTPIN, ledState);
  }

  // now there's lots of time to do other stuff here
}

以這種方式使用 millis() - 以非阻塞方式執行時間 - 是經常需要的東西，因此請考慮使用 elapsedMillis 庫。