// https://forum.arduino.cc/t/need-help-to-l298n/1265112/

const int motor1ForwardPin = 2;
const int motor1BackwardPin = 3;
const int motor2Pin = 4;
const int contact1Pin = 5;
const int contact2Pin = 6;
const int startButton = 7;
const int offLED = 8;

void setup() {
  pinMode(motor1ForwardPin, OUTPUT);
  pinMode(motor1BackwardPin, OUTPUT);
  pinMode(motor2Pin, OUTPUT);
  pinMode(contact1Pin, INPUT_PULLUP);
  pinMode(contact2Pin, INPUT_PULLUP);
  pinMode(startButton, INPUT_PULLUP);
  pinMode(offLED, OUTPUT);

  digitalWrite(offLED, HIGH); // show OFF state

  while (digitalRead(startButton)) {} // wait for BUTTON 7 (start)
  
  digitalWrite(offLED, LOW); // stop OFF state

  // MOTOR 1 FORWARD
  while (digitalRead(contact1Pin) == HIGH) { // wait for BUTTON 5 (limit 1)
    digitalWrite(motor1ForwardPin, HIGH);
    digitalWrite(motor1BackwardPin, LOW);
    digitalWrite(motor2Pin, HIGH);
  }

  // MOTOR 1 REVERSE
  while (digitalRead(contact2Pin) == HIGH) { // wait for BUTTON 6 (limit 2)
    digitalWrite(motor1ForwardPin, LOW);
    digitalWrite(motor1BackwardPin, HIGH);
    digitalWrite(motor2Pin, HIGH);
  }

  // STOP MOTOR 1
  digitalWrite(motor1ForwardPin, LOW);
  digitalWrite(motor1BackwardPin, LOW);
  digitalWrite(motor2Pin, LOW); // disable motor

  digitalWrite(offLED, HIGH); // show OFF state
}

void loop() {
  // nothing
}