Building an Arduino system from scratch

Let's now see how to build an Arduino system on a breadboard using the components we chose.

There are several components to assemble, so the best thing to do is follow the instructions from the following schematic diagram that summarizes all the connections you have to make:

I recommend putting the Arduino microcontroller (ATmega328) first in the middle of the breadboard so you can add the different components around it. This schematic illustrates the placement of the different components:

The following image shows a fully assembled system with the battery pack:

We can now test the project, just to see if it is working correctly. To do so, we are going to make the LED flash with the Blink sketch that comes with the Arduino IDE.