Arduino Uno

ARDUINO UNO R3 Interactive Pinout · Click any pin for details

←

Click any pin on the board
to see its full details here

Alternative Functions

◆ Highlight Pins

PIN LIST   ▼ SHOW

📘 Arduino Uno Pinout Explorer - User Guide

This interactive tool helps you understand the Arduino Uno R3 board by letting you click on any pin to see its complete specifications, functions, and programming notes. Perfect for beginners learning Arduino or experienced makers looking for quick reference.

🔍 How to Use

1 Click Any Pin

Simply click on any pin on the Arduino board diagram. The right panel will instantly show you all details about that pin.

2 Filter Pins

Use the color-coded filter buttons (Digital, PWM, Analog, etc.) to highlight specific pin types on the board.

3 Browse Pin List

Click "SHOW" to expand the complete pin list. Click any pin in the list to select it on the board.

4 Hover for Quick Info

Hover your mouse over any pin to see a tooltip with the pin name, voltage, and main functions.

📚 What Each Pin Shows

Information	Description
Pin ID & Label	The pin number as printed on the board (e.g., 13, A0, 5V)
Full Name	Complete technical name (e.g., "D13 / SCK" or "Analog Reference")
Functions	What the pin can do (GPIO, PWM, ADC, SPI, I2C, etc.)
Voltage	Operating voltage (usually 0-5V for Uno)
Max Current	Maximum current the pin can source/sink (typically 40mA)
Alternative Functions	Special uses like SPI, interrupts, or library-specific functions

🎨 Pin Color Codes

Power (5V, 3.3V, VIN)

Ground (GND)

GPIO (Digital I/O)

ADC (Analog Input)

SPI (Serial Peripheral Interface)

I2C (Inter-Integrated Circuit)

UART (Serial)

PWM (Pulse Width Modulation)

🔧 Board Specifications

• Microcontroller: ATmega328P
• Operating Voltage: 5V
• Digital I/O Pins: 14 (6 PWM)
• Analog Input Pins: 6
• DC Current per I/O: 40 mA
• Flash Memory: 32 KB
• SRAM: 2 KB
• Clock Speed: 16 MHz

💡 Pro Tips

• Pins with ~ support PWM (analogWrite)
• A0-A5 can also be used as digital pins
• Pin 13 LED blinks during boot
• TX/RX pins are connected to USB
• Avoid using pins 0 and 1 during Serial communication
• AREF sets analog reference voltage

🧠 About This Tool

The Arduino Uno Pinout Explorer is free interactive learning tool designed for beginners and experienced makers alike. Whether you're wiring your first LED circuit or designing a complex shield, this visual reference helps you understand each pin's role, limitations, and possibilities.

Version 2.0 • Compatible with Arduino Uno R3 • Free to use • Updated March 2026

Click any pin on the board above to start exploring!