# stepper motor simulation
from machine import Pin, PWM
import time

step_pin=PWM(Pin(4))
dir_pin=Pin(2,Pin.OUT)
ms1=Pin(19,Pin.OUT)
ms2=Pin(18,Pin.OUT)
ms3=Pin(5,Pin.OUT)

while True:
    #clockwise full step
    ms1.off()
    ms2.off()
    ms3.off()
    step_pin.freq(100)
    dir_pin.off()
    time.sleep(20)

    #clockwise half step
    ms1.on()
    ms2.off()
    ms3.off()
    step_pin.freq(100)
    dir_pin.on()
    time.sleep(20)