Picture of Basic Arduino Tutorials : 01 Blinking LED
In this instructable, I'm going to show you how to make a simple circuit/code with an arduino, which will make an LED connected to it flash from off to on, with 1-second intervals, as shown below. 
This is a very easy, basic idea, however it leads to many more complicated codes and circuits.
Remove these adsRemove these ads by Signing Up

Step 1: What you will need

Picture of What you will need
1 x LED
3 x Cables
1 x 330 Ω Resistor
1 x Arduino board (it can be any kind, but for this instructable i used the UNO board).
1 x USB cable
1 x Computer with Arduino software installed (http://www.arduino.cc/en/Main/software if you haven't already got it)
1 x Breadboard

Breadboard/Circuit-board Holder.

Step 2: Attaching the Power Cables and resistor to the Breadboard

Picture of Attaching the Power Cables and resistor to the Breadboard
Firstly you will need to plug one end of a wire into the '5v' Power output on the arduino, and the other end into the positive section of the breadboard.
Then you need to plug one end of a wire into the ground ('GND') Power output, and the other end into the Negative section of the Breadboard.
Finally, you need to plug one end of the resistor from the Negative section of the Breadboard, to any horizontal line on the main section. (NOTE- It is very important to use AT LEAST a 330 ohm resistor with this circuit. If you don't, then you will almost certainly blow the LED.)

Step 3: Attach the control wire to the Breadboard

Picture of Attach the control wire to the Breadboard
Attach a wire from digital port '0' on your Arduino to the hole directly above the resistor.

Step 4: Attaching Led

Picture of Attaching Led
Now to attach the Led into the circuit. Be warned, it will NOT do anything until you have uploaded the code to the board, which is done at a later stage.
the way this is done is to put it so that each pin is next to a wire/resistor. This sounds unclear, but pictures should help
You have to put the LONGER pin next to the wire connected to the port, and the shorter pin next to the resistor.

Step 5: Plug into computer.

Picture of Plug into computer.
Now you need to plug the arduino board into the computer. Nothing really to say here, just make sure that you don't break anything!
MikeB331 month ago

How would that work with the nano on the breadboard? I know that the Nan gets its power from the USB but what about all the plugs that the Nano is sitting in on the breadboard? I assume they are dead?

angela.villareal made it!4 months ago

I'm a 27 years old girl, look what I did! It's never too late to learn anything! Your tutorial was great!

ChristopherZ9 months ago


I'm just starting out with an Arduino and I did this project, but can't figure something out.

It seemed to me that the positive from the 5v to the breadboard doesn't really go anywhere, and I confirmed this by removing it. The LED still blinks. I'm assuming the circuit is completed by the jumper to the digital pin 0.

So, why the 5v jumper to the breadboard?

Lochlan10 months ago

Hi, where did you buy that bread board from?

Here is a super easy Arduino breadboard:


Great tutorial!!
I'm new to all this stuff and before I jump into programming the Arduino I'd like to start by learning a little with analog circuits.

Can I use the Arduino purely as a power supply for my breadboard?

hnvasa1 year ago

Hello, these are some of the great tutorials on starting with Arduino...
I have some other tutorials on Arduino that might be helpful:


brandegor3 years ago
Perfect for me and I'm so danged glad you posted this. If you have time, keep going! This is incredibly helpful. Thanks again!
Phil B3 years ago
I know there are a lot of Instructables on Arduino, but most of them begin beyond a beginner level. Arduino is very new and unfamiliar to me. I appreciate your very basic approach for a "newbie." I look forward to anything like a step-by-step tutorial for someone not currently involved with Arduino. Right now my questions involve, "What is it?" and "Why would I want to use it?" If I were to use Arduino, I would want it to do some useful and necessary task best done by it. I would not be interested in "cool" for the sake of "cool." Thanks.
fergal (author)  Phil B3 years ago
That was my original idea, because when I started using Arduino, I couldn't find any tutorials on basic ideas, and I got very unnerved, So i made this tutorial for beginners, and am looking at making more. Thanks for the feedback!