This example is for Wiring version 0027+. 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
}
}