from machine import Pin, PWM
import utime
rows = [Pin(i, Pin.OUT) for i in (0, 1, 2, 3)]
cols = [Pin(i, Pin.IN, Pin.PULL_DOWN) for i in (4, 5, 6, 7)]
keys = [
    ['1', '2', '3', 'A'],
    ['4', '5', '6', 'B'],
    ['7', '8', '9', 'C'],
    ['*', '0', '#', 'D']
]
servo = PWM(Pin(19))
servo.freq(50)
buzzer = PWM(Pin(17))
buzzer.freq(1000)
def set_servo_angle(angle):
    duty = int((angle / 180) * 5000 + 2500)
    servo.duty_u16(duty)

def sound_buzzer(duration=0.5):
    buzzer.duty_u16(30000)
    utime.sleep(duration)
    buzzer.duty_u16(0)

def scan_keypad():
    for row_num, row in enumerate(rows):
        for r in rows:
            r.value(0)
        row.value(1)
        for col_num, col in enumerate(cols):
            if col.value():
                return keys[row_num][col_num]
    return None


correct_password = "16020"  
entered_password = ""

print("Enter 5-digit password:")

while True:
    key = scan_keypad()
    if key:
        print("Key pressed:", key)
        utime.sleep(0.3) 

        if key.isdigit(): 
            entered_password += key
            print("*" * len(entered_password)) 

        if len(entered_password) == 5:
            if entered_password == correct_password:
                print("correct! Door Open")
                set_servo_angle(0)      
                sound_buzzer(0.2)
                utime.sleep(3)
                set_servo_angle(90)     
            else:
                print(" Wrong Password! Theft Alert!")
                sound_buzzer(1)

            entered_password = ""       
            print("Enter 4-digit password:")

        if key == '*': 
            entered_password = ""
            print("Cleared. Enter again.")