Arduino UNO R3 (Clone)
Arduino Uno is a microcontroller board based on the ATmega328P. 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, 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 an AC-to-DC adapter or battery to get started. You can tinker with your UNO without worry too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.
Arduino Uno Rev 3 is the ideal board for getting started with electronics, through fun and engaging hands-on projects. This board is one of the best entry to the unique Arduino experience and an essential tool for your rapid prototyping needs. Uno Rev 3 is perfect for learning the basics of how sensors and actuators work. Arduino Uno is the first in a series of USB-based Arduino boards.
Operating Voltage: 5V
Input Voltage (recommended): 7-9V MAX
Digital I/O Pins: 14 (of which 6 provide PWM output)
PWM Digital I/O Pins: 6
Analog Input Pins: 6
DC Current per I/O Pin: 20 mA
DC Current for 3.3V Pin: 50 mA
Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader
SRAM : 2 KB (ATmega328P)
EEPROM: 1 KB (ATmega328P)
Clock Speed: 16 MHz
Length: 68.6 mm x 53.4 mm