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arduino · electronics

Arduino blink LED wiring

This breadboard drawing shows the standard Arduino blink circuit. The D13 output feeds a red LED through a 220 ohm current-limiting resistor, and the LED returns to the ground rail. The physical view makes the hole-to-hole connections visible, which is helpful for first-time breadboard assembly. The sketch should use the same pin named in the diagram. Before using the layout in a build or document, compare every label with the source requirements and update the drawing when parts, conditions, or materials change. The example is deliberately small so the essential relationships remain readable, easy to review with collaborators, and ready to extend with the details required for the actual project.

Type Breadboard / Physical wiringStandard Fritzing visual conventionsEngine schematex-breadboardUpdated 9/24/2026
Blink LED on Arduino Uno
Drawing preview
The request

“Draw an Arduino Uno breadboard with a red LED connected to D13 through a 220 ohm resistor and returning to ground.”

Then tryMove the LED signal wire to D9.Change the LED to green.
What is in this drawing

Read the decisions behind it.

01Output

D13 drives the LED.

02Protection

A 220 ohm resistor limits current.

03Return path

The LED connects to ground.

Use for the first Arduino blink exercise.

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FAQ

Common questions

Why use a 220 ohm resistor?

It limits current through the LED.

Which pin drives the LED?

The LED signal comes from D13.

Where does the LED return?

Its other side connects to the ground rail.