Arduino Leonardo R3 Development Board with USB Cable
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Prices updated: 13 Oct 2026
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About this product
The Arduino Leonardo R3 is built around the ATmega32U4, which has USB built into the chip instead of a separate USB-to-serial converter. It can appear to a computer as a keyboard, mouse, or virtual serial port, which suits HID and USB interfacing projects. It offers 20 digital I/O pins (7 with PWM) and 12 analog inputs.
Specifications
- Microcontroller
- ATmega32U4
- Clock Speed
- 16 MHz
- Flash Memory
- 32 KB
- Digital I/O Pins
- 20 (7 PWM)
- Analog Input Pins
- 12
- Operating Voltage
- 5V
- Input Voltage (limit)
- 6V to 20V
- Recommended Input Voltage
- 7V to 12V
Frequently asked questions
What makes the Leonardo different from the Uno?
The ATmega32U4 has native USB, so the board can act as a USB keyboard, mouse, or virtual serial port without a secondary USB chip. During upload, the board may reset and reappear as a different COM port, which is normal behavior for this board.
What input voltage should I use for the DC jack?
The recommended input is 7V to 12V, and the listed input limit is 6V to 20V. Using the recommended range gives the regulator enough headroom for stable 5V operation.
