Basic Blink

A very simple circuit using very simple code. Pin (13) is an output for the LED. This output pin only has two output states:

• ON or HIGH (+5V)
• OFF or LOW (0V).

The program:

• Turns the LED ON and delays 1 second (1000 milliseconds)
• Turns the LED OFF and delays 1 second (1000 milliseconds)
• repeats this behavior over and over again.

Hookup for Basic Blink

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void setup()
{
pinMode(13, OUTPUT);
}

void loop()
{
digitalWrite(13, HIGH);
delay(1000); //1 second (1000 ms per second)
digitalWrite(13, LOW);
delay(1000);
}

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Going Further:

1) Replace the literal value (13 here) with a variable for delay
2) Set the blink rate using a potentiometer
3) Use variable frequency Blink with a high power LED to create a Stroboscope