from machine import Pin
import utime


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


keypad_rows = [9,8,7,6]
keypad_columns = [5,4,3,2]

col_pins = []
row_pins = []



for x in range(0,4):
  row_pins.append(Pin(keypad_rows[x], Pin.OUT))row_pins[x].value(1)
  row_pins[x].value(1)
  col_pins.append(Pin(keypad_columns[x], Pin.IN, Pin.PULL_DOWN))
  col_pins[x].value(0)

print("Please enter a key from the keypad")

def scankeys():
    for row in range(4):
      for col in range(4):
          row_pins[row].high()
          key = None
          
          if col_pins[col].value() == 1:
            print("You have pressed:", matrix_keys[row][col])
            key_press =matrix_keys[row][col]
            utime.sleep(0.3)

      row_pins[row].low()

while True:
  scankeys()