from machine import Pin
import time

# Matriks keypad
keys = [
    ['1', '2', '3'],
    ['4', '5', '6'],
    ['7', '8', '9'],
    ['*', '0', '#']
]

# Baris → input pull-up
row_pins = [Pin(pin, Pin.IN, Pin.PULL_UP) for pin in [23, 22, 21, 19]]

# Kolom → output default HIGH
col_pins = [Pin(pin, Pin.OUT) for pin in [18, 5, 17]]

# Loop pembacaan keypad
def scan_keypad():
    for c_idx, c in enumerate(col_pins):
        c.off()
        for r_idx, r in enumerate(row_pins):
            if not r.value():
                time.sleep_ms(20)
                while not r.value():
                    pass
                c.on()
                return keys[r_idx][c_idx]
        c.on()
    return None

print("Keypad siap dibaca...")
while True:
    key = scan_keypad()
    if key:
        print("Tombol ditekan:", key)
    time.sleep(0.1)