01 3 LED blink

This blinks 3 LEDs in series

Circuit diagram

(credits: https://www.circuito.io/)

Here, you can connect resistor and LED to board directly without breadboard. If you do not have LED, replace 5 with 13 in the code below which will make the on-board LED blink.

Code

void setup() {
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop() {
  digitalWrite(5, HIGH); // Turn LED on
  digitalWrite(6, LOW);
  digitalWrite(9, LOW);
  delay(500);            // Wait 1 second
  digitalWrite(5, LOW); // Turn LED on
  digitalWrite(6, HIGH);
  digitalWrite(9, LOW);
  delay(500);            // Wait 1 second
  digitalWrite(5, LOW); // Turn LED on
  digitalWrite(6, LOW);
  digitalWrite(9, HIGH);
  delay(500);            // Wait 1 second
  }

‹ 02 Distance light switch

00 LED blink ›

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