Example Code
This example code prints on the serial port the number of milliseconds passed since the Arduino board started running the code itself.
unsigned long time;
void setup() {
Serial.begin(9600);
}
void loop() {
Serial.print("Time: ");
time = millis();
Serial.println(time); //prints time since program started
delay(1000); // wait a second so as not to send massive amounts of data
}
Notes and Warnings
Please note that the return value for millis() is of type unsigned long
, logic errors may occur if a programmer tries to do arithmetic with smaller data types such as int
. Even signed long
may encounter errors as its maximum value is half that of its unsigned counterpart.