Arduino UNO

The board as it appears on the Velxio canvas, with its full pin map read live from the simulator (regenerated by scripts/gen-boards.mjs, so it always matches what you can wire).

Family: Arduino & AVR · Languages: Arduino C++

About this board

The ATmega328P at 16 MHz with 32 KB of flash — the default board for most of the catalog’s circuit examples, and the one the wiring and analog pages use. Fourteen digital pins and six analog inputs, with the on-board LED on pin 13.

The UNO is also one of only three boards whose pin map carries signal names: the cards below tell you which pins are PWM, which speak I2C (A4/A5) or SPI (10 through 13), and which belong to the USART. That comes from the board’s own pin metadata, not from a table maintained here.

Start here

New Arduino UNO project opens the editor with this board and a working blink sketch — edit the code, wire components and press Run. The first project tutorial walks the same loop end to end.

Pins (31)

• A5.2analog, i2c
• A4.2analog, i2c
• AREF
• GND.1power
• 13spi
• 12spi
• 11spi, pwm
• 10spi, pwm
• 9pwm
• 8
• 7
• 6pwm
• 5pwm
• 4
• 3pwm
• 2
• 1usart
• 0usart
• IOREF
• RESET
• 3.3Vpower
• 5Vpower
• GND.2power
• GND.3power
• VINpower
• A0analog
• A1analog
• A2analog
• A3analog
• A4analog, i2c
• A5analog, i2c

Every pin above is clickable on the canvas — click one to start a wire. Board-level behavior, quirks and example links live on the family page.