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arduino · electronics

Arduino button and LED wiring

This physical wiring diagram shows a button input and LED output on an Arduino Uno. The button has a pull-down resistor so the D2 input has a defined low state when the button is not pressed. The LED is driven from D13 through a current-limiting resistor. Rail colors separate power and ground from the signal wires, making the breadboard connections easier to follow during assembly. 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 Plaque d’essaiNorme Fritzing visual conventionsMoteur schematex-breadboardMis à jour 24/09/2026
Arduino button and LED
Drawing preview
La demande

“Draw an Arduino Uno breadboard with a push button connected to D2 using a 10k pull-down resistor, and a red LED on D13 through a 220 ohm resistor.”

Essayez ensuiteMove the LED signal wire from D13 to D9.Add a second button on D3.
Ce que contient ce dessin

Comprenez les décisions qui le sous-tendent.

01Input

The button signal goes to D2.

02Pull-down

A 10k resistor holds the input low when open.

03Output

A 220 ohm resistor limits LED current from D13.

Use for a simple Arduino input and output exercise.

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FAQ

Questions fréquentes

Why is a pull-down resistor used?

It keeps the input at a known low level when the button is open.

Why does the LED need a resistor?

It limits current through the LED.

Which pin reads the button?

The button signal is wired to Arduino D2.