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Interface keypad using Raspberry Pi and develop simple password application.
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from gpiozero import DigitalInputDevice, DigitalOutputDevice, Buzzer | |
from time import time, sleep | |
import I2C_LCD_driver | |
col1 = DigitalOutputDevice(17) | |
col2 = DigitalOutputDevice(18) | |
col3 = DigitalOutputDevice(27) | |
col4 = DigitalOutputDevice(22) | |
row1 = DigitalInputDevice(25, pull_up=None, active_state=True) | |
row2 = DigitalInputDevice(12, pull_up=None, active_state=True) | |
row3 = DigitalInputDevice(13, pull_up=None, active_state=True) | |
row4 = DigitalInputDevice(19, pull_up=None, active_state=True) | |
buzzer = Buzzer(26) | |
lcd = I2C_LCD_driver.lcd() | |
def scanCol(colNumber): | |
if colNumber == 0: | |
col1.on() | |
col2.off() | |
col3.off() | |
col4.off() | |
elif colNumber == 1: | |
col1.off() | |
col2.on() | |
col3.off() | |
col4.off() | |
elif colNumber == 2: | |
col1.off() | |
col2.off() | |
col3.on() | |
col4.off() | |
elif colNumber == 3: | |
col1.off() | |
col2.off() | |
col3.off() | |
col4.on() | |
def row1Pressed(): | |
global colNumber | |
global keypadNumber | |
global scanning | |
if col1.value == 1: | |
keypadNumber = 1 | |
elif col2.value == 1: | |
keypadNumber = 2 | |
elif col3.value == 1: | |
keypadNumber = 3 | |
elif col4.value == 1: | |
keypadNumber = 10 | |
scanning = False | |
def row2Pressed(): | |
global colNumber | |
global keypadNumber | |
global scanning | |
if col1.value == 1: | |
keypadNumber = 4 | |
elif col2.value == 1: | |
keypadNumber = 5 | |
elif col3.value == 1: | |
keypadNumber = 6 | |
elif col4.value == 1: | |
keypadNumber = 11 | |
scanning = False | |
def row3Pressed(): | |
global colNumber | |
global keypadNumber | |
global scanning | |
if col1.value == 1: | |
keypadNumber = 7 | |
elif col2.value == 1: | |
keypadNumber = 8 | |
elif col3.value == 1: | |
keypadNumber = 9 | |
elif col4.value == 1: | |
keypadNumber = 12 | |
scanning = False | |
def row4Pressed(): | |
global colNumber | |
global keypadNumber | |
global scanning | |
if col1.value == 1: | |
keypadNumber = 14 | |
elif col2.value == 1: | |
keypadNumber = 0 | |
elif col3.value == 1: | |
keypadNumber = 15 | |
elif col4.value == 1: | |
keypadNumber = 13 | |
scanning = False | |
def row1Released(): | |
global scanning | |
scanning = True | |
def row2Released(): | |
global scanning | |
scanning = True | |
def row3Released(): | |
global scanning | |
scanning = True | |
def row4Released(): | |
global scanning | |
scanning = True | |
row1.when_activated = row1Pressed | |
row2.when_activated = row2Pressed | |
row3.when_activated = row3Pressed | |
row4.when_activated = row4Pressed | |
row1.when_deactivated = row1Released | |
row2.when_deactivated = row2Released | |
row3.when_deactivated = row3Released | |
row4.when_deactivated = row4Released | |
currentMillis = 0 | |
previousMillis = 0 | |
interval = 10 | |
colNumber = 0 | |
keypadNumber = 20 | |
scanning = True | |
passCount = 0 | |
passTimeout = 0 | |
password = "123456" | |
passEnter = "" | |
lcd.lcd_display_string("Please enter ", 1, 0) | |
lcd.lcd_display_string("Password:", 2, 0) | |
buzzer.beep(0.1, 0.1, 1) | |
try: | |
while True: | |
currentMillis = time() * 1000 | |
if currentMillis - previousMillis > interval and scanning == True: | |
previousMillis = currentMillis | |
scanCol(colNumber) | |
colNumber = colNumber+1 | |
if colNumber == 4: | |
colNumber = 0 | |
if passCount: | |
passTimeout = passTimeout+1 | |
if passTimeout > 200: | |
if passEnter == password: | |
lcd.lcd_display_string("CORRECT! Pls etr", 1, 0) | |
buzzer.beep(0.05, 0.05, 2) | |
else: | |
lcd.lcd_display_string("WRONG! Try again", 1, 0) | |
buzzer.beep(0.2, 0.2, 3) | |
passEnter = "" | |
passCount = 0 | |
lcd.lcd_display_string(" ", 2, 9) | |
if passCount == 1 and passTimeout == 1: | |
lcd.lcd_display_string("Scanning... ", 1, 0) | |
if keypadNumber < 20: | |
print(keypadNumber) | |
if keypadNumber < 10 and passCount < 6: | |
passEnter = passEnter + str(keypadNumber) | |
lcd.lcd_display_string(passEnter, 2, 9) | |
buzzer.beep(0.05, 0.05, 1) | |
passCount = passCount+1 | |
passTimeout = 0 | |
keypadNumber = 20 | |
except KeyboardInterrupt: | |
lcd.lcd_clear() |
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