Microcontroller: ATmega328POperating Voltage: 5VInput Voltage (Recommended): 7-12VInput Voltage (Limited): 6-20VDigital I/O Pins: 14 (6 of which provide PWM output)The for Arduino Uno is a microcontroller board based on the ATmega328P (datasheet). It has 14 digital input/output pins (6 of which can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support a microcontroller; simply connect it to a computer using a USB cable or power it with an AC to DC adapter or batteries to get started. You can modify your Uno without worrying about making a mistake; at worst, you can replace it for a few dollars and start over.Technical SpecificationsPWM Digital I/O Pins: 6Analog Input Pins: 6DC Current per I/O Pin: 20 mADC Current per 3.3V Pin: 50 mAFlash Memory: 32 KB (ATmega328P), of which 0.5 KB is used by the bootloaderSRAM: 2 KB (ATmega328P)EEPROM: 1 KB (ATmega328P)Clock Speed: 16 MHzLED_BUILTIN: 13Color: GreenMaterial: PCBPackage Contents:1 x UNO R3 A000066 ATmega328p microcontroller