Arduino UNO

The Arduino Uno is a microcontroller development board that runs sketches and provides digital I/O, analog inputs, PWM outputs, and common serial interfaces. It typically connects to a computer via USB for programming and can be powered through the USB port or the external power jack (7–20V), with additional power pins like 5V and 3.3V and reference/control pins such as AREF and IOREF. Communication with sensors and modules is supported through I2C (SDA/SCL) and SPI (MOSI/MISO/SCK) as well as UART (TX/RX).

Compile target (FQBN): arduino:avr:uno Pinout: 33

Pinout — Arduino UNO

Pin	Signal	Description
`D0`	digital	top digital header hole near right edge
`D1`	TX	top digital header hole
`D2`	digital	top digital header hole
`D3`	PWM	top digital header hole
`D4`	digital	top digital header hole
`D5`	PWM	top digital header hole
`D6`	PWM	top digital header hole
`D7`	digital	top digital header hole
`D8`	digital	top digital header hole
`D9`	PWM	top digital header hole
`D10`	PWM	top digital header hole
`D11`	MOSI	top digital header hole
`D12`	MISO	top digital header hole
`D13`	SCK	top digital header hole
`GND`	ground	top header ground pin
`AREF`	power	top header analog reference pin
`SDA`	SDA	top header I2C data pin
`SCL`	SCL	top header I2C clock pin
`IOREF`	power	bottom power header pin
`RESET`	digital	bottom power header reset pin
`3.3V`	power	bottom power header 3.3V pin
`5V`	power	bottom power header 5V pin
`GND.1`	ground	bottom power header ground pin
`GND.2`	ground	bottom power header ground pin
`VIN`	power	bottom power header VIN pin
`A0`	analog	bottom analog header pin
`A1`	analog	bottom analog header pin
`A2`	analog	bottom analog header pin
`A3`	analog	bottom analog header pin
`A4`	SDA	bottom analog header pin
`A5`	SCL	bottom analog header pin
`USB`	USB
`Power jack`	7V - 20V power jack

Arduino UNO

Pinout — Arduino UNO

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