Introduction

Keyestudio UNO R3 is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs) 6 analog inputs a 16 MHz ceramic resonator a 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.

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.

Features

Stronger RESET circuit.

Atmega 16U2 replace the 8U2.

Specification

Microcontroller: ATmega328

Operating Voltage: 5V

Input Voltage (recommended): 7-12V

Input Voltage (limits): 6-20V

Digital I/O Pins: 14 (of which 6 provide PWM output)

Analog Input Pins: 6

DC Current per I/O Pin: 40 mA

DC Current for 3.3V Pin: 50 mA

Flash Memory: 32 KB (ATmega328) of which 0.5 KB used by bootloader

SRAM: 2 KB (ATmega328)

EEPROM: 1 KB (ATmega328)

Clock Speed: 16 MHz

Wiki page: http://wiki.keyestudio.com/index.php/Ks0001_keyestudio_UNO_R3_BOARD