How to Make a Simple Arduino LED Controller With Only 5 Components


Making an Arduino LED controller is a great way to get started with microcontrollers and electronics. With just 5 basic components, you can build a simple circuit that lets you control an LED light with code.

In this guide, I will walk through the entire process step-by-step. I will cover:

This project is simple enough for beginners, but also a good starting point for more advanced projects. Let's get started!

Components Needed

Here are the 5 components needed for this project:

Circuit Diagram

Here is a circuit diagram showing how everything needs to be connected:

How to Make a Simple Arduino LED Controller With Only 5 Components

Let's break this down:

Now we can build this on a breadboard.

Building the Circuit on a Breadboard

Breadboards have rows of connected holes to insert components. This lets us easily build circuits without soldering.

To build our circuit:

It should match the circuit diagram. Double check all connections before powering on the Arduino!

Arduino Code

Now for the code to make the LED blink on and off. This code will turn the LED on for 1 second, off for 1 second, repeatedly:

void setup() {
pinMode(13, OUTPUT);

void loop() {
digitalWrite(13, HIGH);
digitalWrite(13, LOW);

The setup() function runs once on startup. It sets Arduino pin 13 as an OUTPUT.

The loop() function runs continuously. It turns the LED HIGH (on), waits 1 second, then turns it LOW (off), waits 1 second, and repeats.

This gives the blinking effect. The delays control the timing.

Uploading the Code

With the circuit complete, it's time to upload the code:

Once complete, the code will start running immediately. You should see the LED blinking on and off!

Testing and Troubleshooting

If the LED is not blinking, there are a few things to check:

With some careful troubleshooting, you should be able to get the circuit working! The ability to diagnose and fix issues is an important skill when working with Arduino projects.


Building an Arduino LED controller is a great beginner project that teaches core skills. With just 5 basic components, you can learn about:

This simple example can be extended into more advanced projects, like LED light displays, home automation, and more.

I hope you enjoyed this step-by-step guide to making your own Arduino LED controller. Let me know if you have any other questions!