Arduino-Compatible Leonardo R3 ATmega32U4 Microcontroller Board
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Description
The Leonardo R3 is an ATmega32u4-based development board featuring native USB communication. It can connect directly to a computer as a virtual COM port or emulate standard input devices such as a keyboard and mouse. It is an ideal platform for students, makers, and hobbyists building interactive electronics projects.
Native USB communication
Because the ATmega32u4 microcontroller features built-in USB support, the board eliminates the need for a secondary USB-to-serial processor. This allows it to easily emulate human interface devices like a mouse or keyboard directly over USB.
Flexible input and output options
The board offers 20 digital I/O pins, including 7 PWM channels and 12 analog inputs, giving you ample connectivity for sensors, motors, and peripherals. It also features a 16 MHz crystal oscillator, an ICSP header, a reset button, and a dedicated power jack.
Package contents
The package includes one Leonardo R3 ATmega32U4 development board compatible with the Arduino IDE, along with one USB cable for programming and power.
Specifications
| Device | Leonardo R3-USB |
| Type | COMMS | 20 I/O'S |
| Microcontroller | ATmega32u4 |
| Operating Voltage | 5V |
| Input Voltage (recommended) | 7-12V |
| Input Voltage (limits) | 6-20V |
| Digital I/O Pins | 20 |
| PWM Channels | 7 |
| Analog Input Channels | 12 |
| DC Current per I/O Pin | 40 mA |
| DC Current for 3.3V Pin | 50 mA |
| Flash Memory | 32 KB (ATmega32u4) of which 4 KB used by bootloader |
| SRAM | 2.5 KB (ATmega32u4) |
| EEPROM | 1 KB (ATmega32u4) |
| Clock Speed | 16 MHz |
| Length | 68.6 mm |
| Width | 53.3 mm |
| Weight | 20g |
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