Millis()

Arduino millis

/*Description
Returns the number of milliseconds passed since the Arduino board began running the current program. This number will overflow (go back to zero), after approximately 50 days.

Syntax                                                                     */
time = millis()

/*
Returns
Number of milliseconds passed since the program started.
Return Data type: unsigned long.
*/

Source: arduino.cc

Millis()

unsigned long myTime;

void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.print("Time: ");
  myTime = millis();

  Serial.println(myTime); // prints time since program started
  delay(1000);          // wait a second so as not to send massive amounts of data
}

Source: arduino.cc

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