# Project objective: To test a passive buzzer to play an alarm sound at one second interval
#
# Hardware and connections used:
#   Passive buzzer GND to Raspberry Pi Pico GND
#	Passive buzzer + Pin to GPIO Pin 15
#
# Programmer: Adrian Josele G. Quional

# if passive buzzer is used, import the Speaker class from picozero
from picozero import Speaker
from time import sleep
from picozero import LED

from machine import Pin, I2C
from i2c_lcd import I2cLcd
import utime

#creating a speaker object
speaker = Speaker(15)
#creating an LED object
red = LED(27)
green = LED(28)

#GPIO pins for rows and columns
row_pins = [Pin(i, Pin.OUT) for i in (0, 1, 2, 3)]      # rows: output
col_pins = [Pin(i, Pin.IN, Pin.PULL_DOWN) for i in (4, 5, 6, 7)]  # columns: input
i2c = I2C(0, scl=Pin(9), sda=Pin(8), freq=100000)

i2c_addresses = i2c.scan()
lcd_address = i2c_addresses[0]  # typically 0x27 or 0x3F

lcd = I2cLcd(i2c, lcd_address, 2, 16)  # 2 rows, 16 columns

lcd.putstr("System Ready")
sleep(2)
lcd.clear()

#keypad layout
keys = [
    ['1', '2', '3', 'A'],
    ['4', '5', '6', 'B'],
    ['7', '8', '9', 'C'],
    ['*', '0', '#', 'D']
]

key = ['1','3','5','7']
temp = []
length = 0
def scan_keypad():
    lcd.putstr("Enter Password")
    sleep(1)
    lcd.clear()
    global length
    global temp
    for row_num, row_pin in enumerate(row_pins):
        # Set current row high
        row_pin.high()

        for col_num, col_pin in enumerate(col_pins):
            if col_pin.value() == 1 and length <=3:
                lcd.putstr(keys[row_num][col_num])
                print("Key Pressed:", )
                temp.append(keys[row_num][col_num])
                length = len(temp)
                utime.sleep(0.3)  # debounce delay

        # Set the row low again
        row_pin.low()


while True:
    scan_keypad()
    if length == 4:
        # speaker.on()
        if temp == key:
            green.on()
            print("access granted!")
            sleep(2)
            green.off()
            break
        else:
            red.on()
            print("access denied!", temp);
            temp = []
            length = 0;
            sleep(2)
            red.off()

    # sleep(1)
    speaker.off()




    



# continuously beep at 1 sec interval while the board has power
# note: a passive buzzer can also be used to play different tones
# while True:
#     speaker.on()
#     red.on()
#     sleep(1)
#     speaker.off()
#     red.off()
#     sleep(2)