from machine import Pin, I2C, PWM 
from keypad import Keypad 
from pico_i2c_lcd import I2cLcd 
from time import sleep 
# Initialize I2C interface 
i2c = I2C(0, scl=Pin(1), sda=Pin(0)) 
# Initialize LCD 
lcd = I2cLcd(i2c, 0x27, 2, 16) # Adjust the I2C address and dimensions as 
needed 
# Initialize keypad 
keypad_rows = [Pin(2), Pin(3), Pin(4), Pin(5)] 
keypad_cols = [Pin(6), Pin(7), Pin(8), Pin(9)] 
keypad = Keypad(keypad_rows, keypad_cols, ['1', '2', '3', 'A','4', '5', '6', 
'B','7', '8', '9', 'C','*', '0', '#', 'D']) 
# Initialize servo motor 
servo = PWM(Pin(10)) 
servo.freq(50) # Set PWM frequency to 50Hz (standard for servos) 
# Define default password 
default_password = '1234' 
def set_password(): 
 lcd.clear() 
 lcd.putstr("Set Password:") 
 print("Set Password:") 
 password = '' 
 while len(password) < 4: 
 key = keypad.get_key() 
 if key: 
 password += key 
 lcd.move_to(len(password) - 1, 1) 
 lcd.putchar('*') 
 sleep(0.5) # Add a short delay for readability 
 print(password) 
 return password 
def validate_password(password): 
 lcd.clear() 
 lcd.putstr("Enter Password:") 
 print("Enter Password:") 
 entered_password = '' 
 while len(entered_password) < 4:
key = keypad.get_key() 
 if key: 
 entered_password += key 
 lcd.move_to(len(entered_password) - 1, 1) 
 lcd.putchar('*') 
 sleep(0.3) # Add a short delay for readability 
 print(entered_password) 
 return entered_password == password 
def unlock_door(): 
 for position in range(4500, 9000, 50): 
 servo.duty_u16(position) 
 sleep(0.05) 
 for position in range(9000, 4500, -50): 
 servo.duty_u16(position) 
 sleep(0.05) 
 
# Main loop 
def main(): 
 lcd.putstr("Safety Door Lock") 
 print("Safety Door Lock") 
 sleep(2) 
 
 password = set_password() 
 lcd.clear() 
 lcd.putstr("Password Set") 
 print("Password Set") 
 sleep(2) 
 lcd.clear() 
 
 while True: 
 if validate_password(password): 
 lcd.clear() 
 lcd.putstr("Door Unlocked") 
 print("Door Unlocked") 
 unlock_door() 
 else: 
 lcd.clear() 
 lcd.putstr("Access Denied") 
 print("Access Denied") 
 sleep(2) 
 lcd.clear() 
if __name__ == "__main__": 
 main()