from machine import Pin
import time

# Define GPIO pins for 74595 IC
data_pin = Pin(14, Pin.OUT)  # Serial Data Input (DS)
clock_pin = Pin(12, Pin.OUT)  # Clock Input (SHCP)
latch_pin = Pin(13, Pin.OUT)  # Latch Input (STCP)

# Function to shift out data to 74595 IC
def shift_out(data):
    latch_pin.off()  # Start shifting data
    for i in range(8):
        bit = (data >> i) & 0x01  # Get individual bit
        data_pin.value(bit)  # Set data pin to bit value
        clock_pin.on()  # Pulse clock pin
        clock_pin.off()
    latch_pin.on()  # Latch data to outputs

# Example usage: Shift out binary pattern '10101010'
zero = 0xC0
one  = 0xF9
two  = 0xA4
while True:
    shift_out(zero)
    time.sleep(1)  # Delay for demonstration
    shift_out(one)
    time.sleep(1)  # Delay for demonstration
    shift_out(two)
    time.sleep(1)  # Delay for demonstration