8. LED Blink

How do you plan to solve it?

Set pin to OUTPUT. In a loop, turn it HIGH, wait 400ms, turn it LOW, wait 800ms. Use a ~300Ω resistor to get ~10mA current.

void setup() {
  pinMode(3, OUTPUT);
}

void loop() {
  digitalWrite(3, HIGH);
  delay(400);
  digitalWrite(3, LOW);
  delay(800);

}

Add video of the output (know more)

• https://wokwi.com/projects/442607852185230337

Add a photo of your hardware showing the output.