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.
Blink an LED by BARRAGAN http://barraganstudio.com
turns on and off an LED connected to a digital pin, with intervals of 1 second (1000 milliseconds) Note in the circuit the LED it has a positive (long leg) and a ground (short leg), if the LED doesn't turn ON, it might be it is inverted.
turns on and off an LED connected to a digital pin, with intervals of 1 second (1000 milliseconds) Note in the circuit the LED it has a positive (long leg) and a ground (short leg), if the LED doesn't turn ON, it might be it is inverted.

int ledPin = 0; // LED connected to digital pin 0 void setup() { pinMode(ledPin, OUTPUT); // set ledPin pin as output } void loop() { digitalWrite(ledPin, HIGH); // set the LED on delay(1000); // wait for a second digitalWrite(ledPin, LOW); // set the LED off delay(1000); // wait for a second }