from lcd8bit import*
from keypad import*


password="12345678" #set password
pass_temp=''  # buffer for key in password
print_lcd("start")
while 1:
    key=getkey() # read from keypad
    if key!=0:  # if key is press
        print("key press is:",key)
        if key=='C':
            cmdwrt(0x01)
            pass_temp=''
        elif key=='D':
            if pass_temp==password:
                cmdwrt(0x01)
                cmdwrt(0xc0)
                print_lcd('correct pass')
            else:
                cmdwrt(0x01)
                cmdwrt(0xc0)
                print_lcd('wrong pass')
            pass_temp='' #clear password buffer
        else:
            pass_temp+=key #add key to pass_temp
            print('pass_temp:',pass_temp)
            cmdwrt(0x01)
            cmdwrt(0x80)
            print('pass:',pass_temp)
            for k in pass_temp:
                print_lcd('*')

main.py

diagram.json

from machine import Pin 
from utime import sleep

rs=Pin(2,Pin.OUT)
rw=Pin(3,Pin.OUT)
e=Pin(4,Pin.OUT)
data_line=(Pin(5,Pin.OUT),Pin(6,Pin.OUT),
           Pin(7,Pin.OUT),Pin(8,Pin.OUT),
           Pin(9,Pin.OUT),Pin(10,Pin.OUT),
           Pin(11,Pin.OUT),Pin(12,Pin.OUT))

def write(nilai):  
    rw.value(0) # set write mode
    for i in range(8):
        data_line[i].value((nilai&(0x01<<i))>>i)
    #for i in data_line:
    #    i.value(nilai&0x01)
    e.value(0)
    sleep(0.001)
    e.value(1)
    sleep(0.001)

def cmdwrt(nilai):
    rs.value(0)
    write(nilai)

def datawrt(nilai):
    rs.value(1)
    write(nilai)

def start_lcd():
    cmdwrt(0x38)
    sleep(0.01)
    cmdwrt(0x0c)
    sleep(0.01)
    cmdwrt(0x01)
    sleep(0.01)
    cmdwrt(0x80)
    sleep(0.01)

def print_lcd(ayat):
    for i in ayat:
        datawrt(ord(i))

def zfl_0(s, width):
    return '{:0>{w}}'.format(s, w=width)

def zfl_s(s, width):
    return '{:' '>{w}}'.format(s, w=width)

start_lcd()
    

lcd8bit.py

from machine import Pin 
from utime import sleep

row=(Pin(26,Pin.OUT),Pin(22,Pin.OUT),
     Pin(21,Pin.OUT),Pin(20,Pin.OUT))
col=(Pin(19,Pin.IN,Pin.PULL_UP),Pin(18,Pin.IN,Pin.PULL_UP),
     Pin(17,Pin.IN,Pin.PULL_UP),Pin(16,Pin.IN,Pin.PULL_UP))

label="123A456B789C*0#D"

def getkey():
    value=0  # default value if no key press
    for i in row:
        i.value(1)  # set all row to 1
    for j in range(4): #scan row by row
        row[j].value(0)  # set row to 0
        for i in range(4): 
            if col[i].value()==0:
                sleep(0.01)
                if col[i].value()==0: #debounce
                    while col[i].value()==0: # wait depress
                        pass
                    value=label[i+(j*4)]
                    break
        row[j].value(1)  # set row to 1   

    return value # return value to caller
    

    