The Arduino Micro is the smallest board in the Arduino family, based on the ATmega32U4 with built-in USB. Its compact breadboard-friendly form factor makes it easy to integrate into everyday objects and interactive projects. Like the Leonardo, it can emulate a keyboard, mouse, or other USB HID device.

Developed in conjunction with Adafruit, the Micro has 20 digital I/O pins, 12 analog inputs, 7 PWM channels, and a micro USB connection. Simply plug it into a breadboard and connect to a computer to get started.

Key Features

• Ultra-Compact – 48 × 18 mm breadboard-friendly form factor, just 13g
• Native USB – Built-in USB on the ATmega32U4 enables keyboard, mouse, and HID device emulation
• 20 Digital I/O Pins – 7 usable as PWM outputs
• 12 Analog Inputs – 10-bit resolution on pins A0–A11
• Breadboard Compatible – Drop directly into a solderless breadboard
• USB Overcurrent Protection – Resettable polyfuse protects your computer
• Open-Source Hardware – Schematics and Eagle files freely available

Specifications

• Microcontroller – ATmega32U4
• Operating Voltage – 5V
• Input Voltage – 7–12V recommended (6–20V limits)
• Digital I/O Pins – 20
• PWM Channels – 7
• Analog Input Channels – 12
• DC Current per I/O Pin – 20mA (40mA absolute max)
• DC Current for 3.3V Pin – 50mA
• Flash Memory – 32KB (4KB used by bootloader)
• SRAM – 2.5KB
• EEPROM – 1KB
• Clock Speed – 16MHz
• Board Dimensions – 48 × 18 mm
• Weight – 13g

Ideal For

• USB HID projects (custom keyboards, mice, game controllers, MIDI)
• Wearable electronics and embedded installations
• Breadboard prototyping in tight spaces
• Making everyday objects interactive

Package Contents

• 1× Arduino Micro

Resources

• Getting Started with Arduino Micro
• Schematic (PDF)
• Eagle Design Files
• Pin Mapping (ATmega32U4)
• Arduino Micro Pinout Diagram