from machine import Pin,ADC,PWM,I2C,Timer
import utime
from pico_i2c_lcd import I2cLcd

sda= Pin(0)
scl= Pin(1)

i2c = I2C(0, sda=sda, scl=scl, freq=400000)
devices=i2c.scan()
if len(devices)<=0:
    print("NO Device found")
i2c_addr = devices[0]
lcd = I2cLcd(i2c, i2c_addr, 2, 16)    

adc = ADC(26)

servo = PWM(Pin(5,Pin.OUT))
servo.freq(50)

rows = [Pin(i+6,Pin.OUT) for i in range(4)]
cols = [Pin(i+10,Pin.IN,Pin.PULL_UP) for i in range(4) ]
password = "123A"

lcd.putstr("Garage Locked.")
utime.sleep(1)
lcd.clear()

keys=[
    ['1','2','3','A'],
    ['4','5','6','B'],
    ['7','8','9','C'],
    ['*','0','#','D']
    ]
def keypad():
    for row_index, row_pin in enumerate(rows):
        for r in rows:
            r.value(1)
        row_pin.value(0)
        for col_index, col_pin in enumerate(cols):
            if col_pin.value() == 0:
                return keys[row_index][ col_index]
        row_pin.value(1)
    return None
for row in rows:
    row.value(1)
def check_pass():
    lcd.putstr("Enter PIN : ")
    global password
    inp=""
    for i in range(4):
        while keypad()==None:
            pass
        inp+=keypad()
        utime.sleep(0.3)
    print(inp)
    lcd.clear()
    if inp==password:
        return True
    lcd.putstr("Wrong Pin entered!!")
    utime.sleep(1)
    lcd.clear()
    check_pass()
if check_pass():
    lcd.putstr("Correct PIN Entered")
    utime.sleep(1)
    lcd.clear()
    lcd.putstr("Garage OPEN")
    utime.sleep(1)
    lcd.clear()
lcd.putstr("Use potentiometer to open")
def fn(timer):
    utime.sleep(0.5)
    raw = adc.read_u16()#0-65535
    duty = raw/65535*6200+1800
    servo.duty_u16(int(duty))
    if(duty>=7000):
        lcd.clear()
        lcd.putstr("Door Opened!!")
        t.deinit()
t = Timer(period=1000,mode=Timer.PERIODIC,callback=fn)