Written by 
Leonardo R3 Development Board (ATMEGA32U4) – Arduino Compatible
Product Overview
Experience the power of the ATMEGA32U4 microcontroller on a fully Arduino‑compatible Leonardo R3 board. Designed for makers, hobbyists, and professional developers, this board combines the classic Arduino form factor with advanced USB capabilities, making it ideal for creating keyboards, mice, game controllers, and custom USB devices.
Key Features
- ATMEGA32U4 16 MHz AVR microcontroller with 2 kB EEPROM, 32 kB flash, and 2 kB SRAM
- Built‑in USB 2.0 Full‑Speed (12 Mbps) interface – acts as a native USB device (HID, CDC, MSC)
- Full Arduino IDE support with the standard Leonardo core libraries
- 10× 8‑bit PWM outputs, 12× analog inputs (10‑bit resolution)
- USB‑to‑Serial bridge for easy programming and debugging
- On‑board reset button, power LED, and 5 V/3.3 V regulator
- Compact 68 mm × 53 mm footprint, perfect for breadboards and custom PCBs
- Compatible with Arduino shields and modules (I2C, SPI, UART, etc.)
Technical Specifications
- Core: ATMEGA32U4 (AVR) – 8‑bit, 16 MHz
- Flash: 32 kB (1 kB reserved for bootloader)
- SRAM: 2 kB
- EEPROM: 2 kB
- Operating Voltage: 5 V (USB) / 3.3 V (via regulator)
- Digital I/O Pins: 20 (including 10 PWM)
- Analog Inputs: 12 (10‑bit ADC)
- USB Interface: Full‑Speed (12 Mbps) USB 2.0
- Clock Speed: 16 MHz
- Package: 68 mm × 53 mm, 2.54 mm pitch header
Why Choose Leonardo R3?
The Leonardo R3 board stands out for its native USB functionality, allowing you to emulate a keyboard, mouse, or gamepad without external USB chips. Its robust ATMEGA32U4 core provides ample processing power for complex sketches, while the extensive Arduino library ecosystem ensures a smooth development experience. Whether you’re prototyping a custom controller, building a DIY security system, or creating an interactive art installation, this board delivers reliability and versatility.
Compatibility & Support
Fully compatible with the Arduino IDE (1.8.x and 2.x). Install the “Arduino Leonardo” core and start programming in minutes. The board supports all standard Arduino shields and modules, and its open‑source schematics and libraries are available on GitHub for advanced users who wish to modify or expand the hardware.
Price: Original price was: $ 18.56.$ 6.12Current price is: $ 6.12.