Made withHeron

Heron

Explore·Understand·Build

ATmega328P

USB-B

Power jack

Digital pins

Analog in

L · TX · RX

Lessons

Basics

0/12

OCT 22, 202616:53:59

Meet the board

The Uno is a tiny computer on a card. Its chip runs one program, your sketch, over and over. Hover any part of the board to learn what it does, then press run: the little L light starts to blink.

One chip, 32 KB for your code, 16 million steps a second
Power it from USB or the barrel jack (7 to 12 V)
14 digital pins and 6 analog inputs along the edges

Try it yourself

// The board blinks its own little L light
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}
​
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);
  delay(1000);
}