int motorPin1 = 2;
int motorPin2 = 3;
int motorPin3 = 4;
int motorPin4 = 5;
int spinDelay = 25;
int spinAmount = 220;
int motorState = 0;
boolean motorDirection = true;

int redLight = 6;
int greenLight = 8;

int buttonPin = 12;           // the pin that the pushbutton is attached to
int buttonState = 0;         // current state of the button

void setup() {
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(motorPin3, OUTPUT);
  pinMode(motorPin4, OUTPUT);

  pinMode(redLight, OUTPUT);
  pinMode(greenLight, OUTPUT);

  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
  digitalWrite(greenLight, HIGH); 
  digitalWrite(redLight, LOW); 
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    buttonPushed();
  }
}

void buttonPushed() {
  digitalWrite(greenLight, LOW); 
  digitalWrite(redLight, HIGH); 
  for (int i = 0; i < spinAmount; i++) {
      spinMotor();
      delay(spinDelay);
  }
  motorDirection = !motorDirection;
  // reset state: motor pins low to conserve battery, green light on, red light off
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);

  digitalWrite(greenLight, HIGH); 
  digitalWrite(redLight, LOW); 
}

void spinMotor() {
  if (motorDirection) {
    motorState++;
  } else {
    motorState--;
  }
  if (motorState <= 1) {
    digitalWrite(motorPin1, HIGH);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, LOW);
    if (!motorDirection) {
      motorState = 9;
    }
  }
  if (motorState == 2) {
    digitalWrite(motorPin1, HIGH);
    digitalWrite(motorPin2, HIGH);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, LOW);
  }
  if (motorState == 3) {
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, HIGH);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, LOW);
  }
  if (motorState == 4) {
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, HIGH);
    digitalWrite(motorPin3, HIGH);
    digitalWrite(motorPin4, LOW);
  }
  if (motorState == 5) {
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, HIGH);
    digitalWrite(motorPin4, LOW);
  }
  if (motorState == 6) {
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, HIGH);
    digitalWrite(motorPin4, HIGH);
  }
  if (motorState == 7) {
    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, HIGH);
  }
  if (motorState >= 8) {
    digitalWrite(motorPin1, HIGH);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorPin3, LOW);
    digitalWrite(motorPin4, HIGH);
    if (motorDirection) {
      motorState = 0;
    }
  }
}