Description

Use the Arduino to control a light emitting diode and make it blink.

Components Used

• Light Emitting Diode (LED)
• 220-ohm Resistor
• Arduino board

Arduino Code

int ledPin = 13;                // LED connected to digital pin 13
int counter = 0;

void setup()                    // run once, when the sketch starts
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}

void loop()                     // run over and over again
{
  blink(counter % 5 + 1);
  delay(1000);                  // waits for a second
  counter++;
}

void blink(int sec) {
  digitalWrite(ledPin, HIGH);// sets the LED on
  delay(1000 * sec);         // waits for specified time
  digitalWrite(ledPin, LOW); // sets the LED off
}