Delay(ms)

void delay (unsigned long ms)   

延時(shí)(毫秒)

延時(shí), 單位毫秒(1秒有1000毫秒).

警告:
參數(shù)為unsigned long, 因此在延時(shí)參數(shù)超過32767(int型最大值)時(shí), 需要用"UL"后綴表示為無符號(hào) 長整型, 例如: delay(60000UL);. 同樣在參數(shù)表達(dá)式, 切表達(dá)式中有int類型時(shí), 需要強(qiáng)制轉(zhuǎn)換為 unsigned long類型, 例如: delay((unsigned long)tdelay * 100UL);.
一下例子設(shè)置13引腳對(duì)應(yīng)的LED等以1秒頻率閃爍:

int ledPin = 13;                 // LED connected to digital pin 13

void setup()
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}

void loop()
{
  digitalWrite(ledPin, HIGH);   // sets the LED on
  delay(1000);                  // waits for a second
  digitalWrite(ledPin, LOW);    // sets the LED off
  delay(1000);                  // waits for a second
}