import keypad as key
import lcdi2c as lcd
from utime import sleep
pwd="5678"
sleep(0.1)
print("start")
lcd.strwrite("insert password")
passin=""
while 1:
    a=key.getkey()
    if a!=0:
        print(a)
        if a=='#':
            if passin==pwd:
                lcd.cmdwrite(0xc0)
                lcd.strwrite("correct")
            else:
                lcd.cmdwrite(0xc0)
                lcd.strwrite("wrong")
            passin=""
        elif a=='*':
            lcd.cmdwrite(0x01)
            lcd.strwrite("insert password")
            passin=""  #reset variable 
        else:
            passin+=a
            print(passin)
            lcd.cmdwrite(0xc0)
            lcd.strwrite("           ")
            lcd.cmdwrite(0xc0)
            #lcd.strwrite(passin)   
            for i in passin:
                lcd.strwrite('*')         
            
    sleep(0.3)
    

main.py

diagram.json

from machine import Pin
from utime import sleep

row=(Pin(15,Pin.OUT),Pin(14,Pin.OUT),Pin(13,Pin.OUT),
     Pin(12,Pin.OUT))
col=(Pin(11,Pin.IN,Pin.PULL_UP),Pin(10,Pin.IN,Pin.PULL_UP),
     Pin(9,Pin.IN,Pin.PULL_UP))

label="123456789*0#"

def getkey():
    val=0
    for j in range (4):
        for i in row:
            i.value(1)
        row[j].value(0)
        for i in range(3):
            if col[i].value()==0:
                val=label[i+j*3]
                sleep(0.1)
                while col[i].value()==0:
                    pass
         
    return val




keypad.py

from machine import Pin,I2C
from utime import sleep

e=0x04
rs=0x01
rw=0x02
bl=0x08
lcd = I2C(0, scl=Pin(1), sda=Pin(0), freq=400_000)
ADD=lcd.scan()  
print(ADD) 
add=ADD[0]   #get lcd address and check lcd is available

    
def datawrite(val):
    buf=(val&0xf0)|rs|bl    
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf|e]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)
    buf=((val&0x0f)<<4)|rs|bl    
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf|e]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)

def cmdwrite(val):
    buf=(val&0xf0)|bl    
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf|e]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)
    buf=((val&0x0f)<<4)|bl    
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf|e]))
    sleep(0.001)
    lcd.writeto(add, bytes([buf]))
    sleep(0.001)

def startlcd():
    cmdwrite(0x02)
    sleep(0.01)
    cmdwrite(0x28)
    sleep(0.01)
    cmdwrite(0x0c)
    sleep(0.01)
    cmdwrite(0x01)
    sleep(0.01)
    cmdwrite(0x80)
    sleep(0.01)

def strwrite(word):
    for i in word:
        datawrite(ord(i))

def zfl(s, width):
# Pads the provided string with leading 0's to suit the specified 'chrs' length
# Force # characters, fill with leading 0's
    return '{:0>{w}}'.format(s, w=width)

startlcd()




