# Stepper Motor - Half Stepping

from time import sleep_ms
from machine import Pin

PA = Pin(16,Pin.OUT)
PB = Pin(17,Pin.OUT)
PC = Pin(18,Pin.OUT)
PD = Pin(19,Pin.OUT)

TABLE = [1, 3, 2, 6, 4, 12, 8, 9]

def Step(X):
    Y = TABLE[X % 8]
    PA.value( Y & 8 )
    PB.value( Y & 4 )
    PC.value( Y & 2 )
    PD.value( Y & 1 )
    
x = 0
for i in range(0,200):
    x += 1
    Step(x)
    sleep_ms(10)