from machine import Pin
import time
import keypad

# Set up GPIO pins for the 4x4 Keypad
rows = [Pin(i, Pin.OUT) for i in (2, 3, 4, 5)]
cols = [Pin(i, Pin.IN, Pin.PULL_UP) for i in (6, 7, 8, 9)]

# Create a keypad object
keypad = keypad.Keypad(rows, cols)

# Define the correct password sequence (progressive password)
# User must enter the password one digit at a time
correct_password = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']  # Example progressive password

# This will store the user's input
user_input = []

# Function to show the input on a simple LED indicator (optional)
def led_feedback(state):
    led = Pin(25, Pin.OUT)  # Built-in LED on pin 25 of Raspberry Pi Pico
    led.value(state)

def check_password():
    global user_input
    if user_input == correct_password:
        led_feedback(1)  # Turn on LED if correct password
        print("Password Correct! Access Granted.")
        user_input = []  # Clear input after success
    else:
        led_feedback(0)  # Turn off LED if wrong password
        print("Incorrect Password! Try Again.")
        user_input = []  # Clear input after failure

def main():
    global user_input
    print("Enter password:")
    while True:
        key = keypad.pressed()
        
        if key:
            print("Key pressed:", key)
            user_input.append(key)  # Add the pressed key to the input list
            
            if len(user_input) > len(correct_password):
                print("Too many digits, reset.")
                user_input = []  # Reset input if too long
            
            # Check if the password is correct
            check_password()
            
            time.sleep(0.2)  # Debounce delay to avoid multiple detections

if __name__ == '__main__':
    main()