Arduino Pro Micro (ATmega32U4) 16MHz / 8MHz USB

Available in 5V 16MHz or 3.3V 8MHz Versions

Fully Compatible with Arduino IDE

The Arduino Pro Micro compatible development board features the ATmega32U4 microcontroller with native USB functionality, making it ideal for custom keyboards, USB controllers, automation projects, and embedded systems. Available in both 5V 16MHz and 3.3V 8MHz versions, this compact board supports direct USB communication without requiring an external USB-to-serial converter.

Choose between Micro USB and USB Type-C connectivity to suit your project requirements. With a compact footprint and full compatibility with the Arduino IDE, the Pro Micro is a popular choice for makers, hobbyists, and professional developers building USB-enabled devices.

Key Features

• ATmega32U4 microcontroller with native USB support
• Available in 5V @ 16MHz and 3.3V @ 8MHz versions
• Choice of Micro USB or USB Type-C connector
• No external USB-to-serial chip required
• Compatible with Arduino IDE
• Supports USB HID device emulation
• Compact breadboard-friendly design
• PWM, ADC, UART and digital I/O support

Applications

• Custom keyboards
• USB controllers
• Wearable electronics
• Embedded DIY projects

Technical Features

• Size: 33mm x 18mm (1.3-inch x 0.7-inch)
• ATMega 32U4 running at 5V/16MHz or 3.3V/8MHz
• Supported under Arduino IDE
• Onboard micro-USB connector for programming
• 4 x 10-bit ADC pins
• 12 x Digital I/Os (5 are PWM capable)
• Rx and Tx Hardware Serial Connections
• USB C or Micro USB connector for programming and power

Technical Specifications

Frequently Asked Questions

What is the Arduino Pro Micro used for?

The Pro Micro is commonly used in USB keyboards, gaming controllers, automation devices, HID projects, and compact embedded systems.

Does the Arduino Pro Micro support USB HID?

Yes. The ATmega32U4 includes native USB support, allowing the board to function as a keyboard, mouse, joystick, or custom USB device.

Which board should I select in Arduino IDE?

Select Arduino Micro when programming most Arduino Pro Micro compatible boards.

What is the difference between the 5V and 3.3V versions?

The 5V version operates at 16MHz while the 3.3V version operates at 8MHz for applications requiring lower operating voltage.

Arduino IDE Setup

When setting up the Pro Micro in the Arduino IDE, select the Arduino Micro as the device option.

Additional Resources

The Pro Micro is very popular with lots of useful information on the web with setup details, operational notes and programming examples available. Below are links to useful YouTube videos which may be of use and expand your knowledge of the device.

• Video: How To Turn An Arduino Into A USB Keyboard or Mouse
• Video: Pro Micro ATMEGA32U4 Arduino Pins and 5V, 3.3V Explained
• Video: How to Fix A Bricked Pro Micro (also see this Article)