int speedPin = 5;
int dir1 = 4;
int dir2 = 3;
int mSpeed = 255;
int mSpeed2 = 175;
int dur = 100;
int dur2 = 5000;

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

void loop() {
  //counter clockwise
  digitalWrite(dir1, HIGH);
  digitalWrite(dir2, LOW);
  analogWrite(speedPin, mSpeed);
  delay(dur);
  analogWrite(speedPin, mSpeed2);
  delay(dur2);
}