import machine
import utime

keypad_rows = [machine.Pin(13), machine.Pin(12), machine.Pin(11), machine.Pin(10)]
keypad_cols = [machine.Pin(9), machine.Pin(8), machine.Pin(7), machine.Pin(6)]
segments = [28, 27, 26, 22, 21, 20, 19, 0]

keypad_layout = [
    ['1', '2', '3', 'A'],
    ['4', '5', '6', 'B'],
    ['7', '8', '9', 'C'],
    ['*', '0', '#', 'D']
]
segment_patterns = {
    '0': [0, 0, 0, 0, 0, 0, 1, 1],
    '1': [1, 0, 0, 1, 1, 1, 1, 1],
    '2': [0, 0, 1, 0, 0, 1, 0, 1],
    '3': [0, 0, 0, 0, 1, 1, 0, 1],
    '4': [1, 0, 0, 1, 1, 0, 0, 1],
    '5': [0, 1, 0, 0, 1, 0, 0, 1],
    '6': [0, 1, 0, 0, 0, 0, 0, 1],
    '7': [0, 0, 0, 1, 1, 1, 1, 1],
    '8': [0, 0, 0, 0, 0, 0, 0, 1],
    '9': [0, 0, 0, 1, 1, 0, 0, 1],
    'A': [0, 0, 0, 1, 0, 0, 0, 1],
    'B': [1, 1, 0, 0, 0, 0, 0, 1],
    'C': [0, 1, 1, 0, 0, 0, 1, 1],
    'D': [1, 0, 0, 0, 0, 1, 0, 1],
    '*': [0, 0, 1, 1, 1, 0, 0, 1],
    '#': [1, 1, 0, 0, 0, 1, 0, 1]
}

for row in keypad_rows:
    row.init(machine.Pin.IN, pull=machine.Pin.PULL_UP)

for col in keypad_cols:
    col.init(machine.Pin.OUT)
for pin in segments:
    machine.Pin(pin, machine.Pin.OUT)

def display_character(char):
    if char in segment_patterns:
        pattern = segment_patterns[char]
        for i, segment_pin in enumerate(segments):
            machine.Pin(segment_pin, machine.Pin.OUT).value(pattern[i])


def scan_keypad():
    key = None
    for i in range(len(keypad_cols)):
        keypad_cols[i].low()
        for j in range(len(keypad_rows)):
            if not keypad_rows[j].value():
                key = keypad_layout[j][i]
        keypad_cols[i].high()
    return key

while True:
    key_pressed = scan_keypad()
    display_character(key_pressed)
    utime.sleep(0.1)