Arduino Leonardo R3 Board Micro-USB compatible with Arduino

The Arduino Leonardo is a microcontroller board based on the ATmega32u4. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

UNO-R3-Development-Board compatible with Arduno uses ATmega16U2 instead 8U2 as USB-to-Serial converter, but does not mean its 16K flash would make your R3 faster.  

It is just serving for USB port added SDA and SCL pins for TWI communication placed near to the AREF, but just the copy of PIN4 and PIN5 two other new pins placed near to the Reset pin.

The IOREF that allow the shields to adapt to the voltage provided from the board, the second one is a not connected pin which is reserved for future purposes.  

Applications

• HID projects such as USB keyboard or mouse emulation

• Human-computer interaction systems

• Robotics and automation control

• DIY electronics and embedded projects

• Arduino-based educational platforms

Features:-  

• The UNO R3 board compatible with Arduno has micro controllers: ATmega328.  
• This UNO board compatible with arduno has 14 digital input/output pins (of which 6 can be used as PWM outputs)
• 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.  
• Input Voltage (Recommended): 7V ~ 12V

Pin Diagram:

Specifications:-  

Package Includes:-  

1x UNO R3 SMD Board compatible with Arduino Development Board