from machine import Pin
from time import sleep
print("\n---- START ---\n")
'''
  VCC  Q0  DS  OE STCP SHCP  MR  Q7S
  16   15  14  13  12   11   10   9
    Pinbelegung 74HC505 - DIL 16
   1    2   3   4   5    6    7   8 
  Q1   Q2  Q3  Q4  Q5   Q6   Q7  GND    
'''
data  = Pin( 5, Pin.OUT)   # D5 --- hellgrün --- Pin 14,  DS / SER
latch = Pin( 4, Pin.OUT)   # D2 ---   gelb   --- Pin 12, ST_CP / RCLK
clock = Pin( 2, Pin.OUT)   # D4 ---   cyan   --- Pin 11, SH_CP / SRCLK " "
oe    = Pin(18, Pin.OUT)   # D18 --- ocker   --- Pin 15, OE "Output Enable"
oe.off()
data.off()
latch.off()
clock.off()
dt = 2
# Ausgänge:              L L L L L L L L

#                          123456789
data.value(1)            # _|‾‾‾‾‾‾‾
clock.on(); clock.off()  # __|‾|____
latch.on(); latch.off()  # _____|‾|_
sleep(dt)                    

# Ausgänge:              H L L L L L L L

data.value(1)            # _|‾‾‾‾‾‾‾‾‾‾
clock.on(); clock.off()  # _|‾|____|‾|_
latch.on(); latch.off()  # ____|‾|__|‾|_
sleep(dt)

# Ausgänge:              H H L L L L L L

data.value(0)            # _|‾‾‾‾‾‾‾|___
clock.on(); clock.off()  # _|‾|___|‾|____|‾|_
latch.on(); latch.off()  # __|‾|___|‾|____|‾|_
sleep(dt)

# Ausgänge:              L H H L L L L L 

data.value(1)            # _|‾‾‾‾‾‾‾|_____|‾‾‾|
clock.on(); clock.off()  # _|‾|___|‾|____|‾|___|‾|__
latch.on(); latch.off()  # __|‾|___|‾|____|‾|___|‾|_
sleep(dt)

# Ausgänge:              H L H H L L L L 

def schreibe_bit(bit):
    data.value(bit)
    clock.on(); clock.off() 
    latch.on(); latch.off() 
    sleep(1)

sleep(1)
schreibe_bit(1); sleep(1)
schreibe_bit(0); sleep(0)
schreibe_bit(1); sleep(1)

# Ausgänge:             H L H H L H H L   

print("=== ENDE ===")