ฝากพี่ๆ ดูหน่อยค่ะ
import RPi.GPIO as GPIO
import time

LED_pin = 5
input_pin = 27

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(LED_pin, GPIO.OUT)
GPIO.setup(input_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)

LED_state = False

def toggle_LED(channel):
    global LED_state
    LED_state = not LED_state
    GPIO.output(LED_pin, LED_state)

GPIO.add_event_detect(input_pin, GPIO.FALLING, callback=toggle_LED, bouncetime=300)

try:
    while True:
        time.sleep(0.1)

except KeyboardInterrupt:
    GPIO.cleanup()