Leds are tiny powerful lights that are used in various applications. In these tutorial we shall discuss how to light a blinking led - a hello world program of arduino.

Components Required

  • Breadboard
  • Arduino Mega 2560(any board you have can work. This tutorial will used Arduino Mega 2560)
  • Led
  • 330 ohm Resistor
  • 2 jumper wired

Procedure

  1. Set up your connection as shown in the followinf image.

blinking led

  1. Connect your Arduino Board to your Computer

  2. Start Arduino IDE

  3. Once the Editor is open, Begin by writing the following code in the setup function:

1
2

pinMode(LED_BUILTIN, OUTPUT);
  1. In the loop() function write:
1
2
3
4
5
6
7
8

digitalWrite(LED_BUILTIN, HIGH);

delay(1000)//delay for 1 second

  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);                       // wait for a second

Full source Code

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}