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delayMicroseconds()
Description
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.
Syntax
delayMicroseconds(us)
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);
}
※ NOTES AND WARNINGS:
- 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.
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