Šema povezivanja:

Elementi:
- LED dioda 3 kom
- PUSHBUTTON
- otpornik 220 Ω 3 kom.

Listing programa :

// 3 LED diode - crvena vs plava i zuta
int ledRed = 2;    // izlazi za LED diode
int ledBlue = 4;
int ledYellow = 13;
int brojac;        // broj prolaza

void setup()
{
  pinMode(ledYellow , OUTPUT); // yellow
  pinMode(ledRed, OUTPUT);
  pinMode(ledBlue, OUTPUT);  // blue
}

void loop()
{
  digitalWrite(ledRed , LOW);
  digitalWrite(ledBlue, HIGH);
  digitalWrite(ledYellow, HIGH);

  delay(2000); // Wait for 2000 millisecond(s)

  digitalWrite(ledRed , HIGH);
  digitalWrite(ledBlue, LOW);  // yellow
  digitalWrite(ledYellow, LOW);  // blue
  delay(1000);               // Wait for 1000 millisecond(s)
}