const int sensor1 = 12;
const int sensor2 = 11;
const int driver1 = 10;
const int driver2 = 9;
const int startbutton = 8;
long timer;
int condition;

void setup() {
  pinMode(sensor1, INPUT);
  pinMode(sensor2, INPUT);
  pinMode(driver1, OUTPUT);
  pinMode(driver2, OUTPUT);
  pinMode(startbutton, INPUT);
  timer = 0;
  condition = 0;
}

void loop() {
  if (condition == 0 && digitalRead(startbutton) == HIGH) {
    digitalWrite(driver1, HIGH);
    condition = 1;
  }

  if (condition == 1) {
    timer = 0;
    while (timer < 50000) {
      if (digitalRead(sensor1) == HIGH) {
        digitalWrite(driver1, LOW);
        digitalWrite(driver2, HIGH);
        timer = 50000;
        condition = 2;
      }
      delayMicroseconds(1);
      timer = timer + 1;
    }
  }

  if (condition == 1) {
    digitalWrite(driver1, LOW);
    conditi on = 0;
    timer = 0;
  }


  if (condition == 2) {
    timer = 0;
    while (timer < 50000) {
      if (digitalRead(sensor2) == HIGH) {
        digitalWrite(driver2, LOW);
        timer = 50000;
        condition = 0;
      }
      delayMicroseconds(1);
      timer = timer + 1;
    }
  }

  if (condition == 2) {
    digitalWrite(driver2, LOW);
    condition = 0;
    timer = 0;
  }
}