Write a HIGH or a LOW value to a pin configured as OUTPUT.
Writes a (digital) value to a pin.
The pin must have its mode set to OUTPUT or OUTPUT_OPEN_DRAIN.
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If the pin has been configured as an OUTPUT with pinMode() its voltage will be set to the corresponding value: 3.3V for HIGH, and 0V (ground) for LOW.
Because it is soldered to an LED and resistor in series, your board’s BOARD_LED_PIN will respond slightly more slowly as an output than the other pins.
The following example sets the built-in LED pin to HIGH, makes a one-second-long delay, sets the pin back to LOW, and delays again, causing a blinking pattern (you could also use toggleLED()):
void setup() {
pinMode(BOARD_LED_PIN, OUTPUT); // sets the digital pin as output
}
void loop() {
digitalWrite(BOARD_LED_PIN, HIGH); // sets the LED on
delay(1000); // waits for a second
digitalWrite(BOARD_LED_PIN, LOW); // sets the LED off
delay(1000); // waits for a second
}
License and Attribution
Portions of this page were adapted from the Arduino Reference Documentation, which is released under a Creative Commons Attribution-ShareAlike 3.0 License.