from machine import Pin , PWM
import utime
from time import sleep
pwm = PWM(Pin(14))
pwm.freq(50)
from machine import I2C, Pin 
from pico_i2c_lcd import I2cLcd
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
I2C_ADDR = i2c.scan()[0]
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

matrix_keys = [['1', '2', '3', 'A'],
               ['4', '5', '6', 'B'],
               ['7', '8', '9', 'C'],
               ['*', '0', '#', 'D']]

keypad_rows = [9,8,7,6]
keypad_columns = [5,4,3,2]

col_pins = []
row_pins = []
guess = []
secret_pin = ['1','2','3','4','5','6']
led = Pin(15, Pin.OUT, Pin.PULL_UP)
for x in range(0,4):
    row_pins.append(Pin(keypad_rows[x], Pin.OUT))
    row_pins[x].value(1)
    col_pins.append(Pin(keypad_columns[x], Pin.IN, Pin.PULL_DOWN))
    col_pins[x].value(0)

def setup():
    lcd.move_to(0, 0)
    lcd.putstr("Enter a Key :-")
    utime.sleep(1)
    lcd.clear()
    utime.sleep(1)
    
def scankeys():
    for row in range(4):
        for col in range(4): 
            row_pins[row].high()
            key = None
            if col_pins[col].value() == 1:
                print("You have pressed:", matrix_keys[row][col])
                key_press = matrix_keys[row][col]
                utime.sleep(0.3)
                guess.append(key_press)
                    
            if len(guess) == 6:
                checkPin(guess)
                
                for x in range(0,6):
                    guess.pop() 
                    
        row_pins[row].low()
    
def checkPin(guess):            
    if guess == secret_pin:
        print("You got the secret pin correct")
        lcd.putstr("Door unlock")
        for position in range(4500,9000,50):
            pwm.duty_u16(position)
            sleep(0.05)
        for position in range(9000,4500,-50):
            pwm.duty_u16(position)
            sleep(0.05)
    else:
        print("pin is wrong")
        lcd.putstr("incorrect pin")
        led.value(3)
        utime.sleep(5)
        led.value(0)
print("Enter the secret Pin") 
setup()
while True:
    scankeys()