const int target[] = {13, 12, 11, 10, 9};
const int sensor[] = {7, 6, 5, 4, 3};
const int hit = 6;

void setup()
{
  for (int i = 0; i < 5; i++) {
    pinMode(target[i], OUTPUT);
    pinMode(sensor[i], INPUT);
  }
  pinMode(hit, OUTPUT);

  randomSeed(analogRead(0));
  Serial.begin(9600);
}

void loop()
{
  int rnd = random(0, 6);
  Serial.print(rnd);
  digitalWrite(target[rnd - 1], HIGH);

  int shoot = digitalRead(sensor[rnd - 1]);

  if (shoot=LOW) {
    shoot = digitalRead(sensor[rnd]);
  }
  else{
    digitalWrite(hit, HIGH);
    digitalWrite(target[rnd], LOW);
    delay(1000);
  }
}