int btn = 13;
int ledR = 12;
int ledG = 11;
int ledB = 10;
int pirSensor = 2;

int pocet = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(btn, INPUT_PULLUP);

  pinMode(pirSensor, INPUT);

  pinMode(ledR, OUTPUT);
  pinMode(ledG, OUTPUT);
  pinMode(ledB, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(200);
  // ak je stlačené tlačidlo
  if(digitalRead(pirSensor) == HIGH){
    pocet++;
  }

  if(pocet == 1){
    digitalWrite(ledR, HIGH);
    digitalWrite(ledG, LOW);
    digitalWrite(ledB, LOW);
  }else if(pocet == 2){
    digitalWrite(ledR, LOW);
    digitalWrite(ledG, HIGH);
    digitalWrite(ledB, LOW);    
  }else if(pocet == 3){
    digitalWrite(ledR, LOW);
    digitalWrite(ledG, LOW);
    digitalWrite(ledB, HIGH);
  }else if (pocet == 4){
    pocet = 1;
  }
}