Arduino Uno Rev 3
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 SpecificationsMicrocontroller:ATmega328Operating Voltage:V5Input Voltage (recommended):7-12VInput Voltage (limits):6-20VDigital I/O Pins:4 (of which 6 provide PWM output)Analog Input Pins:6DC Current per I/O Pin: 40mADC Current for 3.3V Pin:50mAFlash Memory:32 KB (ATmega328) of which 0.5 KB used by bootloaderSRAM:2KBEEPROM: 1 KBClock Speed:16MHz