p265 6-4 폴링방식

#btn_poll.py
import RPi.GPIO as GPIO #gpio모듈 사용
import time #time  모듈 사용
GPIO.setmode(GPIO.BCM)
GPIO.setup(24,GPIO.IN)
count =0
while True:
    value = GPIO.input(24)
    if value == True:
        count= count +1
        print count
    time.sleep(0.1)