#define dirPin 2
#define stepPin 3
#define stepPerRev 200

int DIR, CW = HIGH, CC = LOW, DEL, STEPS = 200, count;

void setup() {
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
}

void step(int dir, int del) { // direction and 1/2 pulsewidth
  digitalWrite(dirPin, dir);
  for (int i = 0; i < stepPerRev; i++) {
    digitalWrite(stepPin, HIGH);
    delayMicroseconds(del);
    digitalWrite(stepPin, LOW);
    delayMicroseconds(del);
  }
}

void loop() {
  if (count == 4)  // spin motor four times
    count = 0;
  switch (count) {
    case 0: DIR = CW; DELAY = 3000; break;
    case 1: DIR = CC; DELAY = 2000; break;
    case 2: DIR = CW; DELAY = 1000; break;
    case 3: DIR = CC; DELAY = 500; break;
    default: break;
  }
  step(DIR, DELAY);
  count++;
  delay(500);
}