int masterLines = 9; //Change here to the number of lines of your Master Layer
int slaveLines = 9; //Change here to the number of lines of your Slave Layer

int matrixMaster[] = {2,3,4,5,6,7,8,9,10}; //Put here the pins you connected the lines of your Master Layer
int matrixSlave[] = {11,12,13,A5,A4,A3,A2,A1,A0}; //Put here the pins you connected the lines of your Slave Layer

void setup() {
    Serial.begin(9600);
    Serial.println("OpenDarts"); //This line is not necessary, is just here for debug purposes
    Serial.println("Master pinovi-(Digitalni izlazi)");
    //Ipisivanje Master pinova
    for(int i = 0; i < masterLines; i++){
      Serial.print(matrixMaster[i]);
      Serial.print(", ");
    }
    Serial.println(" ");
    //Ispisivanje Slave pinova:
    //Ipisivanje Master pinova
    Serial.println("Slave pinovi-(Digitalni ulazi)");
    for(int i = 0; i < slaveLines; i++){
      Serial.print(matrixSlave[i]);
      Serial.print(", ");
    }
    Serial.println(" ");
    //Postavljanje pinmodea
    for(int i = 0; i < slaveLines; i++){
        pinMode(matrixSlave[i], INPUT_PULLUP);
    }
    for(int i = 0; i < masterLines; i++){
        pinMode(matrixMaster[i], OUTPUT);
        digitalWrite(matrixMaster[i], HIGH);
    }
}

void loop() {
    for(int i = 0; i < masterLines; i++){
        digitalWrite(matrixMaster[i], LOW);
        for(int j = 0; j < slaveLines; j++){
            if(digitalRead(matrixSlave[j]) == LOW){
                Serial.print(matrixSlave[j]);
                Serial.print(",");
                Serial.println(matrixMaster[i]);
                delay(300);
                break;
            }
        }
        digitalWrite(matrixMaster[i], HIGH);
    }
}