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delay()

Pauses the program for a specified number of milliseconds.

Signature

void delay(unsigned int ms);

Parameters

Parameter Type Description
ms unsigned int Duration to pause, in milliseconds

Return value

None (void).

Milliseconds

One second = 1000 milliseconds. Common values:

Call Pause duration
delay(100) 0.1 seconds
delay(500) 0.5 seconds (half a second)
delay(1000) 1 second
delay(5000) 5 seconds

Example

Blinking a light: on for one second, off for one second:

void loop(void) {
    digitalWrite(18, HIGH);
    delay(1000);
    digitalWrite(18, LOW);
    delay(1000);
}

See also