Microcontroller: ATmega328P Operating Voltage: 5V Input Voltage (Recommended): 7-12V Input Voltage (Limited): 6-20V Digital 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 Specifications PWM Digital I/O Pins: 6 Analog Input Pins: 6 DC Current per I/O Pin: 20 mA DC Current per 3.3V Pin: 50 mA Flash Memory: 32 KB (ATmega328P), of which 0.5 KB is used by the bootloader SRAM: 2 KB (ATmega328P) EEPROM: 1 KB (ATmega328P) Clock Speed: 16 MHz LED_BUILTIN: 13 Color: Green Material: PCB Package Contents: 1 x UNO R3 A000066 ATmega328p microcontroller