micros()

Description

Returns the number of microseconds since the Arduino board began running the current program. This number will overflow (go back to zero), after approximately 70 minutes. On the boards from the Arduino Portenta family this function has a resolution of one microsecond on all cores. On 16 MHz Arduino boards (e.g. Duemilanove and Nano), this function has a resolution of four microseconds (i.e. the value returned is always a multiple of four). On 8 MHz Arduino boards (e.g. the LilyPad), this function has a resolution of eight microseconds.

Syntax

time = micros()

Parameters

None

Returns

Returns the number of microseconds since the Arduino board began running the current program. Data type:

unsigned long

Example Code

The code returns the number of microseconds since the Arduino board began.

1unsigned long time;
2
3    void setup() {
4      Serial.begin(9600);
5    }
6    void loop() {
7      Serial.print("Time: ");
8      time = micros();
9
10      Serial.println(time); //prints time since program started
11      delay(1000);          // wait a second so as not to send massive amounts of data
12    }

Notes and Warnings

There are 1,000 microseconds in a millisecond and 1,000,000 microseconds in a second.

See also

• delay()
• delayMicroseconds
• millis()