import time, random
from machine import Pin, I2C, SoftI2C
from pico_i2c_lcd import I2cLcd

time.sleep(0.1)

i2c = SoftI2C(sda = Pin(0), scl = Pin(1), freq = 400000)
addr = i2c.scan()[0]
lcd = I2cLcd(i2c, addr, 2, 16)

rows = [16, 17, 18, 19]  
cols = [20, 21, 22, 26]

row_pins = [Pin(pin, Pin.OUT) for pin in rows]
col_pins = [Pin(pin, Pin.IN, Pin.PULL_DOWN) for pin in cols]
keypad = [
    ['1', '2', '3', 'A'], 
    ['4', '5', '6', 'B'],
    ['7', '8', '9', 'C'], 
    ['*', '0', '#', 'D']
    ]

def scan():
    entered_password = ""
    while True:
        for i, row_pin in enumerate(row_pins):
            row_pin.value(1)
            for j, col_pin in enumerate(col_pins):
                if col_pin.value() == 1:
                    entered_password += keypad[i][j]
                    print("Key pressed:", keypad[i][j])
                    time.sleep(0.2)
            row_pin.value(0)
            if '#' in entered_password:
                entered_password = entered_password[:len(entered_password)-1]
                return entered_password




x = random.randint(1,21)
y = random.randint(1,21)
z = x + y

lcd.putstr(str(x))
time.sleep(2)
lcd.move_to(4,0)
lcd.putstr(str(y))
value = int(scan())
lcd.move_to(0,1)
if value==z:
    lcd.putstr("Correct Value")
else:
    lcd.putstr("Incorrect Value")