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Arduino LED Blink Tutorial – How to Blink an LED Using Digital Pin 2

  Introduction One of the first projects every Arduino beginner learns is the LED Blink project. It is simple, easy to understand, and helps you learn the basics of programming and controlling electronic components using an Arduino board. In this tutorial, we will connect an LED to Digital Pin 2 of an Arduino Uno and make it blink continuously. Components Required Arduino Uno LED 220Ω Resistor Breadboard Jumper Wires USB Cable Circuit Connection Connect the components as follows: Arduino Digital Pin 2 → 220Ω Resistor → LED Positive (Long Leg) LED Negative (Short Leg) → Arduino GND The resistor is important because it limits the current flowing through the LED and protects it from damage. Arduino Code const int ledPin = 2; void setup() { pinMode(ledPin, OUTPUT); } void loop() { digitalWrite(ledPin, HIGH); delay(1000); digitalWrite(ledPin, LOW); delay(1000); } Code Explanation 1. Define the LED Pin const int ledPin = 2; This line tells Arduino that the LED is connected t...
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Arduino Uno Connection Test – How to Verify Your Board is Working

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  Introduction If you are new to Arduino, the first thing you should do after connecting your Arduino Uno to your computer is verify that the board is working correctly. The easiest way to do this is by uploading a simple LED Blink program. The Arduino Uno has a built-in LED connected to digital pin 13. If the LED starts blinking after uploading the program, it means your board, USB cable, Arduino IDE, and COM port are all working correctly. Requirements Before starting, make sure you have the following: Arduino Uno USB Cable (Type-B) Computer Arduino IDE installed Step 1 – Connect the Arduino Uno Connect the Arduino Uno to your computer using the USB cable. Open the Arduino IDE and configure the correct board. Go to Tools → Board Select Arduino Uno Next, select the correct COM Port. Go to Tools → Port Choose the COM port assigned to your Arduino. Step 2 – Upload the Blink Test Code Copy and upload the following code. void setup() { pinMode(LED_BUILTIN, OUTPUT); } void loop() { ...
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What is Arduino? – A Complete Beginner's Guide (2026)

Introduction If you are interested in electronics, robotics, or the Internet of Things (IoT), you have probably heard about Arduino . It is one of the most popular open-source electronics platforms used by students, hobbyists, engineers, and developers around the world. Arduino makes it easy to build electronic projects without needing advanced knowledge of electronics. Whether you want to create a smart home system, an automatic lighting project, a weather station, or a robot, Arduino provides a simple and affordable way to get started. In this guide, you'll learn what Arduino is, how it works, why it's popular, and how you can begin building your own projects. What is Arduino? Arduino is an open-source electronics platform based on easy-to-use hardware and software. It consists of programmable microcontroller boards and the Arduino IDE (Integrated Development Environment), which allows you to write and upload code to the board. Simply put, Arduino acts as the "brain...
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Basic Arduino Light System (LED ON/OFF)

Components: Arduino Uno LED 220Ω resistor Breadboard + wires Connection: LED + leg → Pin 8 LED - leg → GND (through 220Ω resistor) Code: int led = 8; void setup() {   pinMode(led, OUTPUT); } void loop() {   digitalWrite(led, HIGH); // ON   delay(1000);   digitalWrite(led, LOW);  // OFF   delay(1000); }  
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