from time import sleep

# Define GPIO pins for the 74HC595 module

dataPin = 17 # GPIO pin connected to DS (data)

latchPin = 27 # GPIO pin connected to ST_CP (latch)

clockPin = 22 # GPIO pin connected to SH_CP (clock)

# Define GPIO pin for the button

buttonPin = 18

# Seven-segment digit encoding (common cathode)

# Segment order: a, b, c, d, e, f, g

digits = {

'0': 0b00111111, '1': 0b00000110, '2': 0b01011011, '3': 0b01001111,

'4': 0b01100110, '5': 0b01101101, '6': 0b01111101, '7': 0b00000111,

'8': 0b01111111, '9': 0b01101111

}

# Setup GPIO

GPIO.setmode(GPIO.BCM)

GPIO.setup(dataPin, GPIO.OUT)

GPIO.setup(latchPin, GPIO.OUT)

GPIO.setup(clockPin, GPIO.OUT)

GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) # Button with pull-up

# Function to shift out the data to 74HC595

def shift_out(data):

GPIO.output(latchPin, GPIO.LOW) # Begin the latch

for i in range(8):

GPIO.output(clockPin, GPIO.LOW)

GPIO.output(dataPin, GPIO.HIGH if data & (1 << (7 - i)) else GPIO.LOW)

GPIO.output(clockPin, GPIO.HIGH)

GPIO.output(latchPin, GPIO.HIGH) # Latch the output

# Function to display a number on the 7-segment display

def display_number(num):

num_str = str(num).zfill(4) # Pad the number to 4 digits

for digit in num_str:

shift_out(digits[digit]) # Send each digit to the display

sleep(0.001) # Small delay to avoid flickering

# Button press detection with debouncing

def button_pressed():

if GPIO.input(buttonPin) == GPIO.LOW:

sleep(0.2) # Debounce delay

if GPIO.input(buttonPin) == GPIO.LOW:

return True

return False

# Main loop

current_number = 0

try:

while True:

display_number(current_number)

if button_pressed():

current_number += 1

if current_number > 9999: # Roll over after 9999

current_number = 0

sleep(0.1)

except KeyboardInterrupt:

GPIO.cleanup()