from machine import Pin
import time
print("hello")

row=[Pin(i, Pin.OUT) for i in range(4)]
col=[Pin(i, Pin.IN, Pin.PULL_DOWN) for i in range(16,20)]

led1 = Pin(27, Pin.OUT)
led2 = Pin(26, Pin.OUT)
led3 = Pin(22, Pin.OUT)
led4 = Pin(21, Pin.OUT)
led5 = Pin(20, Pin.OUT)


key=[
    [1,2,3,"A"],
    [4,5,6,"B"],
    [7,8,9,"C"],
    ["*",0, "#","D"]
]
def hashKey(led):
    for i in range(4):
        row[i].high()
        for j in range(4):
            if(col[j].value() ==1 and key[i][j] == "#"):
                led.on()
                time.sleep(2)
                led.off()
                return 1
        row[i].low()
def Key_scan():
    for i in range(4):
        row[i].high()
        for j in range(4):
            if col[j].value()==1:
                if(key[i][j] == 1):
                    while True:
                        time.sleep(0.05)
                        done = 0
                        done = hashKey(led1)
                        if done == 1:
                            break
                elif(key[i][j] == 2):
                    while True:
                        time.sleep(0.05)
                        done = 0
                        done = hashKey(led2)
                        if done == 1:
                            break
                elif(key[i][j] == 3):
                    while True:
                        time.sleep(0.05)
                        done = 0
                        done = hashKey(led3)
                        if done == 1:
                            break
                elif(key[i][j] == 4):
                    while True:
                        time.sleep(0.05)
                        done = 0
                        done = hashKey(led4)
                        if done == 1:
                            break
                elif(key[i][j] == 5):
                    while True:
                        time.sleep(0.05)
                        done = 0
                        done = hashKey(led5)
                        if done == 1:
                            break
                
        row[i].low()

while True:
    time.sleep(0.05)
    Key_scan()