from machine import Pin
import utime

# Define shift register pins
DATA_PIN = Pin(5, Pin.OUT)   # Serial Data
CLOCK_PIN = Pin(6, Pin.OUT)  # Shift Clock
LATCH_PIN = Pin(7, Pin.OUT)  # Storage Latch

def shift_out(value):
    """Shift out 8-bit binary data to 74HC595"""
    for i in range(8):
        bit = (value >> (7 - i)) & 1  # Extract MSB first
        DATA_PIN.value(bit)  # Send bit
        CLOCK_PIN.value(1)  # Clock HIGH
        utime.sleep_us(1)  # Small delay
        CLOCK_PIN.value(0)  # Clock LOW

    # Latch the data
    LATCH_PIN.value(1)
    utime.sleep_us(1)
    LATCH_PIN.value(0)

def left_shift():
    """Shift LED from left to right"""
    value = 0b00000001
    for _ in range(8):
        shift_out(value)
        value <<= 1  # Left shift
        utime.sleep(0.45)

def right_shift():
    """Shift LED from right to left"""
    value = 0b10000000
    for _ in range(8):
        shift_out(value)
        value >>= 1  # Right shift
        utime.sleep(0.45)
def Pingpong():
    value = 0b10000000
    for _ in range(8):
        shift_out(value)
        value >>= 1  # Right shift
        utime.sleep(0.45)
    value = 0b00000001
    for _ in range(8):
        shift_out(value)
        value <<= 1  # Left shift
        utime.sleep(0.45)

def alternative_shift():
    """Blink alternate LEDs"""
    patterns = [0b10101010, 0b01010101]  # Alternating LEDs
    for _ in range(10):  # Run 10 times
        for pattern in patterns:
            shift_out(pattern)
            utime.sleep(0.45)

while True:
    left_shift()       # Move LED left
    right_shift()      # Move LED right
    Pingpong()         # Blink alternate LEDs
    utime.sleep(1)     # Pause before repeating