Code Examples

import RPi.GPIO as GPIO
import time
import signal
import sys

# GPIO pin configuration
LED_PIN = 18
BUTTON_PIN = 17

# Setup GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(LED_PIN, GPIO.OUT)
GPIO.setup(BUTTON_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)

# Initialize LED state
led_state = False
GPIO.output(LED_PIN, led_state)

def signal_handler(sig, frame):
    """Clean up GPIO on exit"""
    print('\\nCleaning up GPIO...')
    GPIO.cleanup()
    sys.exit(0)

# Register signal handler
signal.signal(signal.SIGINT, signal_handler)

def button_callback(channel):
    """Callback function for button press"""
    global led_state
    led_state = not led_state
    GPIO.output(LED_PIN, led_state)
    print(f"LED {'ON' if led_state else 'OFF'}")

# Add event detection for button
GPIO.add_event_detect(BUTTON_PIN, GPIO.FALLING, 
                     callback=button_callback, bouncetime=200)

print("GPIO Control Example Started")
print("Press button to toggle LED (Ctrl+C to exit)")

try:
    while True:
        time.sleep(0.1)
        
except KeyboardInterrupt:
    pass

finally:
    GPIO.cleanup()
    print("GPIO cleaned up successfully")