import machine
import utime

# Define GPIO pins for the 7-segment display (a-g segments)
seg_pins = [0, 1, 2, 3, 4, 5, 6]

# Define GPIO pins for the keypad rows and columns
row_pins = [26,22,21,20]
col_pins = [19,18,17,16]

# Define the characters to display for each keypad key (including letters A, B, C, D)
keypad_characters = [
    '1', '2', '3', 'A',
    '4', '5', '6', 'B',
    '7', '8', '9', 'C',
    '*', '0', '#', 'D'
]

# Initialize the GPIO pins for the 7-segment display
for pin in seg_pins:
    machine.Pin(pin, machine.Pin.OUT)

# Initialize the keypad and set up the GPIO pins
for row_pin in row_pins:
    machine.Pin(row_pin, machine.Pin.IN, machine.Pin.PULL_UP)

for col_pin in col_pins:
    machine.Pin(col_pin, machine.Pin.OUT)

# Function to scan the keypad and return the pressed key
def scan_keypad():
    for col_pin in col_pins:
        machine.Pin(col_pin, machine.Pin.OUT)
        for row_pin in row_pins:
            if not machine.Pin(row_pin).value():
                machine.Pin(col_pin, machine.Pin.IN, machine.Pin.PULL_UP)
                return (col_pins.index(col_pin), row_pins.index(row_pin))
        machine.Pin(col_pin, machine.Pin.IN, machine.Pin.PULL_UP)
    return None

# Function to display a character on the 7-segment display
def display_character(character):
    # Define the 7-segment display patterns for characters
    display_patterns = {
        '0': (0, 0, 0, 0, 0, 0, 1),
        '1': (1, 0, 0, 1, 1, 1, 1),
        '2': (0, 0, 1, 0, 0, 1, 0),
        '3': (0, 0, 0, 0, 1, 1, 0),
        '4': (1, 0, 0, 1, 1, 0, 0),
        '5': (0, 1, 0, 0, 1, 0, 0),
        '6': (0, 1, 0, 0, 0, 0, 0),
        '7': (0, 0, 0, 1, 1, 1, 1),
        '8': (0, 0, 0, 0, 0, 0, 0),
        '9': (0, 0, 0, 1, 1, 0, 0),
        'A': (0, 0, 0, 1, 0, 0, 0),
        'B': (0, 0, 0, 0, 0, 0, 0),
        'C': (0, 1, 1, 0, 0, 0, 1),
        'D': (0, 0, 0, 0, 0, 0, 1),
        '*': (1, 1, 1, 1, 1, 1, 1),
        '#': (0, 0, 1, 1, 0, 0, 0)
    }

    if character in display_patterns:
        pattern = display_patterns[character]
        for pin, state in enumerate(pattern):
            machine.Pin(seg_pins[pin], machine.Pin.OUT).value(state)

# Main loop

while True:
    key = scan_keypad()
    if key is not None:
        col, row = key
        displayed_character = keypad_characters[col + row * 4]
        display_character(displayed_character)