Ouputs either HIGH or LOW at a specified pin.
pin: the pin number
none
int ledPin = 13; // LED connected to digital pin 13 void setup() { pinMode(ledPin, OUTPUT); // sets the digital pin as output } void loop() { digitalWrite(ledPin, HIGH); // sets the LED on delay(1000); // waits for a second digitalWrite(ledPin, LOW); // sets the LED off delay(1000); // waits for a second }
Sets pin 13 to HIGH, makes a one-second-long delay, and sets the pin back to LOW.