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 ceramic resonator (CSTCE16M0V53-R0), 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.

Specifications:

• Microcontroller : ATmega328P
• Operating Voltage : 5V
• Input Voltage (recommended) : 7-12V
• Input Voltage (limit) : 6-20V
• 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
• Communication : UART , I2C , SPI
• 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
• LED_BUILTIN : 13
• Length : 68.6 mm
• Width : 53.4 mm
• Weight : 25 g