# -*- coding: utf-8 -*-
from RPi import GPIO
from datetime import datetime
import os, time


GPIOPin = 17

def button_callback(gpio_number):
    print("Button pressed!")
    datetime_string = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
    filename = "/home/pi/img_%s.jpg" % datetime_string
    os.system("raspistill -o %s" % filename)

GPIO.setmode(GPIO.BCM)
GPIO.setup(GPIOPin, GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.add_event_detect(GPIOPin, GPIO.RISING, callback=button_callback)

try:
    while True:
        time.sleep(0.01)
except:
    GPIO.cleanup()