byte state = 0;
unsigned long m = 0;
int tlacitko =0;

void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  Serial.begin(9600);
  attachInterrupt(0, zmena, FALLING);//prerušenie
  digitalWrite(7,LOW);
}

void semafor(int red, int orange, int green) {
  digitalWrite(13, red);
  digitalWrite(12, orange);
  digitalWrite(11, green);
}
void chodec(int red1, int green1) {
  digitalWrite(9, red1);
  digitalWrite(8, green1);
}

void zmena(){
  tlacitko=1;
  Serial.println("prerusenie");
  digitalWrite(7,HIGH);
}

void loop() {
   if (millis() - m >= 1000) {
    switch (state) {
      case 0:
        Serial.println("RED");
        semafor(1, 0, 0);
        chodec(0, 1);
        break;
      case 1:
        Serial.println("RED+ORANGE");
        semafor(1, 1, 0);
        chodec(1, 0);
        break;
      case 2:
        Serial.println("GREEN");
        semafor(0, 0, 1);
        chodec(1, 0);
        break;
      case 3:
        Serial.println("ORANGE");
        semafor(0, 1, 0);
        chodec(1, 0);
        break;
    }
    state = state + 1;
    if (state > 3) state = 0;
    m = millis();
  }
if (tlacitko==1)
    {
      tlacitko=0;     
      Serial.println("RED-prerusenie");
      semafor(1, 0, 0);
      delay(3000) ;
      chodec(0, 1);
      delay(3000) ;
      state = 0;
      digitalWrite(7,LOW);
    }
}