Arduino compatible · UNO-R3

Arduino Uno R3

Name: Arduino Uno R3
Brand: Arduino compatible
SKU: MCU-UNO-R3
Price: 1400 KES
Availability: InStock

KSh 1,400In stock

Quantity

Specification

Part number: UNO-R3
Manufacturer: Arduino compatible
Stock code: MCU-UNO-R3
Category: Atmega
Supply voltage: 5 V
Connection: USB
Protocol: I2C
Protocol: SPI
Protocol: UART
Mounting: Through-hole
Availability: 30 in stock

Details

The board most people start on, and the one most Kenyan workshops keep a drawer of. An ATmega328P at 16 MHz, 14 digital I/O and 6 analog inputs, powered over USB-B or a barrel jack. Shields stack straight onto it, which is why it stays in service long after you have outgrown it.

Stock here is Arduino-compatible rather than Italian-made, so the USB-serial chip is usually a CH340 — on Windows you may need the CH340 driver before the port shows up. If uploads fail with an avrdude sync error, try Tools > Processor > ATmega328P (Old Bootloader).

Ask about this part

Answers come from this listing and the assistant can still be wrong — the manufacturer's datasheet is what governs. For anything you are going to wire up, check it there or ask us.

Helpful links

Using this part

Starting points, not finished firmware. Check them against the datasheet.

Blink the on-board LED

cpp

// Nothing to wire — the LED is already on pin 13.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);
  delay(1000);
}

Read a potentiometer and dim an LED

cpp

// Pot wiper -> A0, outer legs -> 5V and GND
// LED anode -> D9 via a 220R resistor, cathode -> GND

void setup() {
  Serial.begin(9600);
  pinMode(9, OUTPUT);
}

void loop() {
  int raw = analogRead(A0);   // 10-bit: 0..1023
  analogWrite(9, raw / 4);    // 8-bit PWM: 0..255
  Serial.println(raw);
  delay(50);
}