from machine import Pin
import time

# Pin definitions
DIR = Pin(26, Pin.OUT)
STEP = Pin(25, Pin.OUT)

stepsPerRev = 200
revs = 3

def stepPulse():
    STEP.value(1)
    time.sleep_us(1000)
    STEP.value(0)
    time.sleep_us(1000)

def rotate(steps):
    for i in range(steps):
        stepPulse()

# setup()
DIR.init(Pin.OUT)
STEP.init(Pin.OUT)

# loop()
while True:
    # Clockwise rotation
    DIR.value(1)
    rotate(revs * stepsPerRev)
    time.sleep_ms(500)

    # Counter-clockwise rotation
    DIR.value(0)
    rotate(revs * stepsPerRev)
    time.sleep_ms(500)