from machine import Pin , I2C
from time import sleep
from esp32_i2c_lcd import I2cLcd

lcdI2C = I2C(scl = Pin(22), sda = Pin(21), freq = 100000)
print(lcdI2C.scan())
lcd = I2cLcd(lcdI2C,0x27,2,16)
lcd.clear()

rowPins = ( Pin(13,Pin.OUT),
            Pin(12,Pin.OUT),
            Pin(14,Pin.OUT),
            Pin(27,Pin.OUT))
colPins = ( Pin(26,Pin.IN,Pin.PULL_DOWN),
            Pin(25,Pin.IN,Pin.PULL_DOWN),
            Pin(33,Pin.IN,Pin.PULL_DOWN),
            Pin(32,Pin.IN,Pin.PULL_DOWN))

def getpad():
    numPad = (  (1,2,3,4),
                (5,6,7,8),
                (9,10,11,12),
                (13,14,15,16)   )
    for r in range(4):
        for row in rowPins:
            row.value(0)
        rowPins[r].value(1)
        for c in range(4):
            if colPins[c].value() == 1:
                return numPad[r][c]
    return -1

lcd.putstr("Password: ")
password = "1234"
Key_Input = ""

while True:
    KeyPad = getpad()                        
    if KeyPad >= 0:                             
        Key_Input += str(KeyPad)                
        lcd.clear()                             
        lcd.putstr("Password: " + Key_Input) 
        if len(Key_Input) == 4:          
            if Key_Input == password:      
                lcd.clear()
                lcd.putstr("pw is correct.\n")
                lcd.putstr("   GODD  LUCK")
                break
            else:
                lcd.clear()
                lcd.putstr("pw is incorrect.\n")
                lcd.putstr("please try again")
                sleep(3)
            Key_Input = ""
            lcd.clear()
            lcd.putstr("Password: ")
    sleep(0.1)