Tutorial 2: Control a LED

Controlling a LED is one of the simplest things you can do with an Arduino. Only a few common components are needed to get your software changing your physical environment. In this tutorial I will shed a little light on how to digitally turn a device on and off.

What you need...

Arduino Uno
USB-A – USB-B Cable
Breadboard
LED
220 – 1000 ohm Resistor
Breadboard compatible wires

DIFFICULTY

EASY

CIRCUITRY KNOWLEDGE

LITTLE

C++ PROGRAMMING

LITTLE

ABOUT

MINUTES

What you will learn...

The code...

You can copy / paste the code below if you’re having issues with typos or want a shortcut. However I recommend that you follow along in the tutorial to understand what is going on!


int x = 0 ;
int LED_Pin = 13 ;

void setup() {
  Serial.begin(9600) ;
  pinMode(LED_Pin, OUTPUT) ;
}

void loop() {
  x += 1 ;
  Serial.print("This is loop iteration ") ;
  Serial.println(x) ;

  digitalWrite(LED_Pin, HIGH) ;
  delay(500) ;
  digitalWrite(LED_Pin, LOW) ;
  delay(500) ;
}