The Arduino Board Leonardo without Headers (A000052) is a compact microcontroller board that brings native USB capabilities to your projects. Tailored for developers, hobbyists, and designers, it ships without header pins so you can solder your own connections for a custom setup.

Key Features & Design

• Microcontroller – ATmega32U4 with built-in USB for native USB communication.
• Clock – 16 MHz crystal for precise timing and responsive performance.
• Memory – 32 KB flash, 2.5 KB RAM, and 1 KB EEPROM for code and data storage.
• I/O Availability – 20 digital I/O pins and 12 analog inputs to support sensors, actuators, and HID devices.
• USB & HID Capabilities – Native USB controller enables easy USB gadget functionality (keyboard, mouse, joystick) without a separate USB-to-serial chip.
• Headers – Ships without header pins, allowing you to solder your own connectors or pins for a tailored configuration.
• IDE Compatibility – Fully compatible with the Arduino IDE, facilitating straightforward code uploads and library integration.

Performance / Benefits

With native USB support and a compact footprint, the Leonardo enables real-time, interactive projects that communicate directly over USB. It’s well-suited for HID projects, data logging, robotics, and rapid prototyping where reliable USB connectivity matters. The headerless design provides flexibility for custom enclosures or wiring, while the expansive Arduino ecosystem offers plenty of tutorials, example code, and community support to streamline development.