Timer

This example is for Wiring version 0024+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.

Led blink using millis() by BARRAGAN

Demonstrates how to blink an LED at an interval rate using a timer


int ledPin = 48;                // onboard LED          
int status = LOW;               // led status, initially LOW               
unsigned long previousTime;     // timer variable       
int interval = 5000;  // interval for blinking 5 seconds     

void setup()
{
  pinMode(ledPin, OUTPUT);   
  previousTime = millis();  // mark the time
}

void loop()
{
  // if current time - previousTime is greater than 5 seconds
  // change the LED status
  if((millis() - previousTime) > interval) {
    // invert the LED status 
    if (status == LOW) {
      status = HIGH;
    } 
    else {
      status = LOW;
    }
    digitalWrite(ledPin, status);
    previousTime = millis();   // mark the time
  }
}