The Uno R3 (Arduino compatible) board contains everything needed to support the onboard ATmega328 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. 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. This version of the board has a socketed/replaceable ATmega328 chip (see CAT ARD-24). Recommended operating voltage, 5-9 Vdc.
Spec sheet available in PDF format.
