int speedPin = 5;
int dir1 = 4;
int dir2 = 3;
int mSpeed = 0;
int dur = 500;

int BP1 = 8;
int BP2 = 9;
int B1Val;
int B2Val;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(speedPin, OUTPUT);
  pinMode(dir1, OUTPUT);
  pinMode(dir2, OUTPUT);
  pinMode(BP1, INPUT);
  pinMode(BP2, INPUT);
  digitalWrite(BP1, HIGH);
  digitalWrite(BP2, HIGH);
}

void loop() {
  //counter clockwise
  B1Val = digitalRead(BP1);
  B2Val = digitalRead(BP2);
  Serial.println("Motor speed: " + mSpeed);

  if(B1Val == 0){
    mSpeed -= 10;
    delay(dur);
  }

  if(B2Val == 0){
    mSpeed += 10;
    delay(dur);
  }

  if(mSpeed > 255){
    mSpeed = 255;
  }

  if(mSpeed < -255){
    mSpeed = -255;
  }

  if(mSpeed == 10){
    mSpeed = 100;
  }

  if(mSpeed == -10){
    mSpeed = -100;
  }

  if(mSpeed == 90 || mSpeed == 95){
    mSpeed = 0;
  }

  if(mSpeed == -90 || mSpeed == -95){
    mSpeed = 0;
  }

  if (mSpeed == 0){
    analogWrite(speedPin,0);
  }

  if (mSpeed > 0){
    digitalWrite(dir1,LOW);
    digitalWrite(dir2,HIGH);
    analogWrite(speedPin,mSpeed); 
  }

  if (mSpeed < 0){
    digitalWrite(dir1,HIGH);
    digitalWrite(dir2,LOW);
    analogWrite(speedPin,abs(mSpeed)); 
  }
}