Pauses the program for the amount of time (in microseconds) specified by the parameter. There are a thousand microseconds in a millisecond and a million microseconds in a second.

Currently, the largest value that will produce an accurate delay is 16383. This could change in future Arduino releases. For delays longer than a few thousand microseconds, you should use delay() instead.



Parameter Values

  • us: the number of microseconds to pause. Allowed data types: unsigned int.

Return Values

  • Nothing

Example Code

Example 1

The code configures pin number 8 to work as an output pin. It sends a train of pulses of approximately 100 microseconds period. The approximation is due to execution of the other instructions in the code.

int outPin = 8; // digital pin 8 void setup() { pinMode(outPin, OUTPUT); // sets the digital pin as output } void loop() { digitalWrite(outPin, HIGH); // sets the pin on delayMicroseconds(50); // pauses for 50 microseconds digitalWrite(outPin, LOW); // sets the pin off delayMicroseconds(50); // pauses for 50 microseconds }

Example 2

Generate a 10-microsecond pulse for use in ultrasonic sensor

int trigPin = 9; // TRIG pin int echoPin = 8; // ECHO pin float duration_us, distance_cm; void setup() { Serial.begin (9600); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); } void loop() { // generate a 10-microsecond pulse to TRIG pin digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration_us = pulseIn(echoPin, HIGH); // measure duration of pulse from ECHO pin distance_cm = 0.017 * duration_us; // calculate the distance // print the value to Serial Monitor Serial.print("distance: "); Serial.print(distance_cm); Serial.println(" cm"); delay(500); }


  • This function works very accurately in the range 3 microseconds and up. We cannot assure that delayMicroseconds will perform precisely for smaller delay-times.
  • As of Arduino 0018, delayMicroseconds() no longer disables interrupts.

See Also


Arduino UNO R3
Arduino Starter Kit
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