Arduino Uno R3

Operating Voltage

5 V

Input Voltage Vin

6-20 V

Logic Level

5 V

Clock Speed

16 MHz

Flash Memory

32 kB

Sram

2 kB

Eeprom

1 kB

Gpio Count

20

Pwm Channels

6

Adc Channels

6

Uart Interfaces

1

Spi Interfaces

1

I2c Interfaces

1

Usb

USB-B

Operating Temperature

-40 to 85 °C

Community starter examples — minimal, unofficial, and provided to get you wiring fast. Verify against the manufacturer datasheet before relying on them.

// Arduino Uno R3 - blink + analog read starter
#ifdef LED_BUILTIN
  #define LED LED_BUILTIN   // D13 on the Uno
#else
  #define LED 2             // fallback for boards without LED_BUILTIN
#endif

void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop() {
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
  delay(500);
  Serial.print("A0="); Serial.println(analogRead(A0));   // 0..1023
}

# NOTE: the Uno's ATmega328P has no MicroPython port.
# Equivalent blink shown on a MicroPython board (ESP32) for comparison:
from machine import Pin
import time

led = Pin(2, Pin.OUT)   # ESP32 onboard LED

while True:
    led.value(1); time.sleep(0.5)
    led.value(0); time.sleep(0.5)

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