'''
R1 - 18
R2 - 5
R3 - 17
R4 - 16
C1 - 33
C2 - 32
C3 - 35
C4 - 34
'''

from machine import Pin
import time

R1 = Pin(18, Pin.OUT)
R2 = Pin(5,  Pin.OUT)
R3 = Pin(17, Pin.OUT)
R4 = Pin(16, Pin.OUT)

C1 = Pin(33, Pin.IN)
C2 = Pin(32, Pin.IN)
C3 = Pin(35, Pin.IN)
C4 = Pin(34, Pin.IN)

while True:
    R1.value(0)
    R2.value(1)
    R3.value(1)
    R4.value(1)
    if C1.value() == 0:
        print("Key Pressed: 1")
    elif C2.value() == 0:
        print("Key Pressed: 2")
    elif C3.value() == 0:
        print("Key Pressed: 3")
    elif C4.value() == 0:
        print("Key Pressed: A")
    R1.value(1)
    R2.value(0)
    R3.value(1)
    R4.value(1)
    if C1.value() == 0:
        print("Key Pressed: 4")
    elif C2.value() == 0:
        print("Key Pressed: 5")
    elif C3.value() == 0:
        print("Key Pressed: 6")
    elif C4.value() == 0:
        print("Key Pressed: B")
    R1.value(1)
    R2.value(1)
    R3.value(0)
    R4.value(1)
    if C1.value() == 0:
        print("Key Pressed: 7")
    elif C2.value() == 0:
        print("Key Pressed: 8")
    elif C3.value() == 0:
        print("Key Pressed: 9")
    elif C4.value() == 0:
        print("Key Pressed: C")
    R1.value(1)
    R2.value(1)
    R3.value(1)
    R4.value(0)
    if C1.value() == 0:
        print("Key Pressed: *")
    elif C2.value() == 0:
        print("Key Pressed: 0")
    elif C3.value() == 0:
        print("Key Pressed: #")
    elif C4.value() == 0:
        print("Key Pressed: D")