Summary of Blink Arduino Sketch
This article presents the standard Arduino "Blink" sketch, a foundational example that toggles an on-board LED connected to digital pin 13. The code initializes the pin as an output in the setup phase and then enters a continuous loop where it turns the LED on for one second and off for another second repeatedly.
Parts used in the Blink Project:
- Arduino board (Uno or Leonardo)
- On-board LED
- Digital pin 13
This is a standard Arduino example sketch, copied here for reference.
Full Source Code
The full code is all in one file Blink.ino.
/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
Most Arduinos have an on-board LED you can control. On the Uno and
Leonardo, it is attached to digital pin 13. If you're unsure what
pin the on-board LED is connected to on your Arduino model, check
the documentation at http://www.arduino.cc
This example code is in the public domain.
modified 8 May 2014
by Scott Fitzgerald
*/
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin 13 as an output.
pinMode(13, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(13, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
Source: Blink Arduino Sketch
- Which pin controls the on-board LED on most Arduinos?
The on-board LED is attached to digital pin 13. - How long does the LED stay on in this sketch?
The LED stays on for one second before turning off. - What function runs once when the board is reset?
The setup function runs once when you press reset or power the board. - How is the voltage level set to turn the LED on?
The voltage level is set to HIGH to turn the LED on. - What happens if I am unsure which pin the LED is connected to?
You should check the documentation at http://www.arduino.cc. - Does the loop function run only once?
No, the loop function runs over and over again forever.
