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Feature

PERFECTLY COMPATIBLE with ARDUINO: right out of the box
FAST TRANSFER & MORE MEMORY: USB-TTL used ATMEGA 16U2 chip, controller used ATMEGA 328P chipUS ATMEL original
EXCELLENT QUALITY: solder is very clean, everything is aligned nicely, all boards will make function,voltage, current testing before packaging
Cool Yellow-black Design: the yellow silk screen on black mask make it easy to read the pin labels
FCC and CE CERTIFICATION: this board made from green components and materials, it is really safe

Description

Introduction
keyestudio Uno R3 is a microcontroller board based on the ATmega328 (datasheet), fully compatible with ARDUINO UNO REV3.
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, 2 ICSP headers 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.
Note that the two ICSP headers separately used to program the firmware to ATMEGA16U2-MU and ATMEGA328P-PU, but we have programmed the two chips, so generally no need to use them.
The Uno R3 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 programmed as a USB-to-serial converter.
The UNO is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with.

Tech Specs
MicrocontrollerATmega328P-PU
Operating Voltage5V
Input Voltage (recommended)7-12V
Digital I/O Pins14 (of which 6 provide PWM output)
PWM Digital I/O Pins6 (D3, D5, D6, D9, D10, D11)
Analog Input Pins6 (A0-A5)
DC Current per I/O Pin20 mA
DC Current for 3.3V Pin50 mA
Flash Memory32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM2 KB (ATmega328P-PU)
EEPROM1 KB (ATmega328P-PU)
Clock Speed16 MHz
LED_BUILTIND13

Features
1.0 pinout: added SDA and SCL pins that are near to the AREF pin and 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.
Stronger RESET circuit.
Atmega 16U2 replace the 8U2.

The Original Box Includes
1 X KEYESTUDIO UNO R3 Board
1 X USB Cable