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keypad.py
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keypad.py
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# Using a 4x3 keypad with combonation verification
import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BCM)
KEYPAD = [
[1,2,3],
[4,5,6],
[7,8,9],
["*",0,"#"]
]
#BCM GPIO numbers
ROW = [17,4,3,2]
COLUMN = [18,15,14]
# pin of your choice
PIN = '1359'
# store user input
input = ''
loop = True
for i in range(3):
GPIO.setup(COLUMN[i], GPIO.OUT)
GPIO.output(COLUMN[i], 1)
for j in range(4):
GPIO.setup(ROW[j], GPIO.IN, pull_up_down = GPIO.PUD_UP)
try:
while(loop):
#keyboard code
for i in range(3):
GPIO.output(COLUMN[i],0)
for j in range(4):
if GPIO.input(ROW[j]) == 0:
print (KEYPAD[j][i])
input+= str(KEYPAD[j][i])
while GPIO.input(ROW[j]) == 0:
pass
GPIO.output(COLUMN[i],1)
# check input length
if(len(input) == 4):
if(input == PIN):
print("Correct")
input = ''
loop = False
else:
print("Wrong")
input = ''
except KeyboardInterrupt:
GPIO.cleanup()