The Arduino UNO 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 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.

Technical Specifications:
– Microcontroller: ATmega328
– Operating Voltage: DC5V
– Input Voltage (recommended): 7-12V
– Input Voltage (limits): 6-20V
– Digital IO Pins: 4 (of which 6 provide PWM output)
– Analog Input Pins: 6
– DC Current per IO Pin: 40mA
– DC Current for 3.3V Pin: 50mA
– Flash Memory: 32 KB (ATmega328) of which 0.5 KB used by bootloader
– SRAM: 2 KB
– EEPROM: 1 KB
– Clock Speed: 16 MHz

Package List:
1x Arduino UNO R3 Board