from machine import Pin, PWM
import utime

# --- Keypad setup ---
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 and buzzer setup ---
                servo = PWM(Pin(19))
                servo.freq(50)

                buzzer = PWM(Pin(17))
                buzzer.freq(1000)

                # --- Functions ---
                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

                                                                                                            # --- Main Program ---
                                                                                                            correct_password = "1234"   # your 4-digit password
                                                                                                            entered_password = ""

                                                                                                            print("Enter 4-digit password:")

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

                                                                                                                                            if key.isdigit():  # if it's 0-9
                                                                                                                                                        entered_password += key
                                                                                                                                                                    print("*" * len(entered_password))  # hide password

                                                                                                                                                                            if len(entered_password) == 4:
                                                                                                                                                                                        if entered_password == correct_password:
                                                                                                                                                                                                        print("✅ Correct! Door Open")
                                                                                                                                                                                                                        set_servo_angle(0)       # open door
                                                                                                                                                                                                                                        sound_buzzer(0.2)
                                                                                                                                                                                                                                                        utime.sleep(3)
                                                                                                                                                                                                                                                                        set_servo_angle(90)      # close door again
                                                                                                                                                                                                                                                                                    else:
                                                                                                                                                                                                                                                                                                    print("🚨 Wrong Password! Theft Alert!")
                                                                                                                                                                                                                                                                                                                    sound_buzzer(1)

                                                                                                                                                                                                                                                                                                                                entered_password = ""        # reset for next try
                                                                                                                                                                                                                                                                                                                                            print("Enter 4-digit password:")

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