from machine import Pin
import time

# Define pins connected to the 74HC595
data_pin = Pin(25, Pin.OUT)  # DS  --> Serial Input
clock_pin = Pin(13, Pin.OUT)  # SHCP  --> Serial Clock
latch_pin = Pin(26, Pin.OUT)  # STCP   --> latch

# Define pin connected to the button
button_pin = Pin(23, Pin.IN)  # Button connected to pin 14

# Initial state of Q1
q1_state = 0

def shift_out(value):
    for i in range(8):
        data_pin.value((value >> i) & 1)
        clock_pin.value(1)
        time.sleep_us(1)
        clock_pin.value(0)

def update_shift_register(value):
    latch_pin.value(0)
    shift_out(value)
    latch_pin.value(1)

# Function to toggle Q1
'''
def toggle_q1():
    global q1_state
    q1_state = 1 - q1_state  # Toggle between 0 and 1
    update_shift_register(q1_state << 1)  # Shift Q1 state to the correct bit position
'''
# Function to toggle Q1
def toggle_q1():
    global q1_state
    q1_state = 1 - q1_state  # Toggle between 0 and 1
    # Create a byte with only Q1 affected
    value = q1_state << 1
    update_shift_register(value)

# Example usage
last_button_state = 1  # Assume button is not pressed initially

while True:
    current_button_state = button_pin.value()
    print(f'Status before : {current_button_state}')
    
    if last_button_state == 1 and current_button_state == 0:
        # Button was pressed
        toggle_q1()
        time.sleep(0.2)  # Debounce delay
    
    last_button_state = current_button_state
    print(f'Status after : {last_button_state}')
    time.sleep(0.01)  # Small delay to avoid bouncing issues