Leonardo R3 Development Board ATmega32U4

The Leonardo R3 is an Arduino-compatible microcontroller board built around the ATmega32U4 chip, offering a genuinely different approach compared to standard Uno-style boards. Rather than relying on a separate USB-to-serial chip, the ATmega32U4 handles USB communication directly on-die, letting the Leonardo appear to a connected computer as a keyboard, mouse, or virtual COM port without any secondary processor. This makes it an excellent choice for makers building custom HID devices, game controllers, macro keypads, or interactive USB peripherals.

With 20 digital I/O pins, 7 of which support PWM output, and 12 analog input channels, the Leonardo offers plenty of room to connect sensors, motors, displays, and other components for robotics, automation, and prototyping projects. A 16MHz crystal oscillator keeps timing-sensitive tasks running smoothly, while the onboard micro USB connection, power jack, ICSP header, and reset button provide everything needed to get a project running straight out of the box.

The board can be powered through USB, an external 7-12V adapter, or a battery, giving flexibility for both bench prototyping and standalone deployment. Fully supported by the Arduino IDE, the Leonardo R3 is well suited for students, hobbyists, and engineers looking to build interactive electronics, wearable projects, or embedded systems that need native USB device emulation.

Specification:

• Microcontroller : ATmega32U4
• Operating Voltage : 5V
• Input Voltage (Recommended) : 7V – 12V
• Input Voltage (Limits) : 6V – 20V
• Digital I/O Pins : 20 (7 PWM Outputs)
• Analog Input Pins : 12
• DC Current per I/O Pin : 40mA
• DC Current for 3.3V Pin : 50mA
• Flash Memory : 32KB (4KB used by Bootloader)
• SRAM : 2.5KB
• EEPROM : 1KB
• Clock Speed : 16MHz
• USB Connection : Micro USB
• Board Dimensions : 68.6 x 53.3mm