Lab 1 - Blinking LED

Submitted by seanchen on Tue, 02/05/2013 - 22:43


I used Arduino with a green LED. I changed the code to lighting up for 2 seconds and then off for 4 seconds. Uploaded the code and made sure that it has changed.



  • 1 Arduino
  • 1 LED
  • 1 Resistor (220Ω)
  • 1 Breadboard



Turns on an LED on for one second, then off for one second, repeatedly.

This example code is in the public domain.

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);

// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(2000); // wait for 2 second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(4000); // wait for 4 second

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