Arduino Tutorials

Led interfacing with arduino (blink)

In this tutorial, we’ll learn led interfacing and programming with arduino uno. Anode of led is connected to digital pin 13 of arduino uno. Light emitting diode is a two-terminal device, which emits light when connected in forward biased mode. forward biased means, anode of led to positive terminal of battery and cathode of led to negative terminal of battery. you can also simulate this circuit in proteus simulation software.

Materials required

  • Arduino uno
  • Led
  • 330 ohm resistor

Circuit arrangement

Code :

// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN 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

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