Arduino UNO R3 Microcontroller ATmega328P Chip

The Arduino UNO R3 is the board most people learn electronics on — and for good reason. It is built around the ATmega328P, an 8-bit AVR microcontroller running at 16 MHz, with 32 KB of flash memory for your sketches, 2 KB of SRAM and 1 KB of EEPROM for data that must survive a power cut.

The UNO works at 5 V logic, which makes it directly compatible with the huge range of sensors, relays, motor drivers and shields designed for it. It gives you 14 digital input/output pins (6 of them with PWM) and 6 analog inputs, and it can be powered from USB, from a 7–12 V adapter through the DC jack, or through the VIN pin.

Features

• ATmega328P 8-bit microcontroller at 16 MHz
• 14 digital I/O pins, including 6 PWM outputs (pins 3, 5, 6, 9, 10, 11)
• 6 analog inputs (A0–A5) with 10-bit resolution
• UART, I²C (A4/A5) and SPI (pins 10–13) communication
• Flexible power: USB, DC barrel jack (7–12 V) or VIN pin, with onboard 5 V and 3.3 V outputs
• Standard header layout compatible with Arduino shields
• Supported natively by the Arduino IDE — no extra board package needed

Specifications

• Microcontroller: ATmega328P
•  Architecture: 8-bit AVR
• Clock speed: 16 MHz
• Flash memory: 32 KB
• SRAM / EEPROM: 2 KB / 1 KB
• Operating voltage: 5V -12V
• Digital I/O: 14 (6 PWM)
• Analog inputs: 6 × 10-bit
• Current per I/O pin: 20 mA (40 mA absolute max)
• 3.3 V pin current: 50 mA